119-474: The Strait of Gibraltar crossing is a hypothetical bridge or tunnel spanning the Strait of Gibraltar (about 14 km or 9 miles at its narrowest point) that would connect Europe and Africa . The governments of Spain and Morocco appointed a joint committee to investigate the feasibility of linking the two continents in 1979, which resulted in the much broader Euromed Transport project. In January 2021, it
238-471: A 2002 referendum . Nevertheless, Gibraltar maintains close economic and cultural links with Spain, with many Gibraltarians speaking Spanish as well as a local dialect known as Llanito . Gibraltar's economy rests on financial services, e-gaming, tourism and the port. With one of the world's lowest unemployment rates, the largest part of the labour force are resident in Spain or non-Gibraltarians, especially in
357-561: A British citizen (" an entitlement that cannot be refused ") under section 5 of the Act. Under the subsequent British Overseas Territories Act 2002 , all British Overseas Territories citizens became British citizens on 21 May 2002. Gibraltar is not a sovereign state: its formal international relations are the responsibility of the Government of the United Kingdom. Since Brexit, it is not part of
476-584: A Swiss engineering and design company, was retained to draft a design for a railway tunnel. According to the company, the main differences between the construction of this tunnel and that of the Channel Tunnel , linking France and Great Britain , are the depth of the sea and the geological conditions. The area under the Strait is less stable than that under the English Channel. An active major geologic fault ,
595-596: A bridge-restaurant which is a bridge built to serve as a restaurant. Other suspension bridge towers carry transmission antennas. Conservationists use wildlife overpasses to reduce habitat fragmentation and animal-vehicle collisions. The first animal bridges sprung up in France in the 1950s, and these types of bridges are now used worldwide to protect both large and small wildlife. Bridges are subject to unplanned uses as well. The areas underneath some bridges have become makeshift shelters and homes to homeless people, and
714-521: A 1.2 km (0.75 mi) land border with Spain. The town of La Línea de la Concepción , a municipality of the province of Cádiz , lies on the Spanish side of the border. The Spanish hinterland forms the comarca of Campo de Gibraltar (literally "Countryside of Gibraltar"). The shoreline measures 12 km (7.5 mi) in length. There are two coasts ("Sides") of Gibraltar: the East Side, which contains
833-549: A bid for city status as part of the Platinum Jubilee Civic Honours . The bid was refused, but when researchers looked through the National Archives , they found that it had already been recognised as a city by Queen Victoria in 1842. The status came into force on 29 August 2022. Under its current constitution , Gibraltar has almost complete internal self-governance through a parliament elected for
952-520: A bridge is to be designed, standards authorities specify simplified notional load models, notably HL-93, intended to give the same load effects as the characteristic maximum values. The Eurocode is an example of a standard for bridge traffic loading that was developed in this way. Most bridge standards are only applicable for short and medium spans - for example, the Eurocode is only applicable for loaded lengths up to 200 m. Longer spans are dealt with on
1071-471: A case-by-case basis. It is generally accepted that the intensity of load reduces as span increases because the probability of many trucks being closely spaced and extremely heavy reduces as the number of trucks involved increases. It is also generally assumed that short spans are governed by a small number of trucks traveling at high speed, with an allowance for dynamics. Longer spans on the other hand, are governed by congested traffic and no allowance for dynamics
1190-480: A combination of structural health monitoring and testing. This is regulated in country-specific engineer standards and includes an ongoing monitoring every three to six months, a simple test or inspection every two to three years and a major inspection every six to ten years. In Europe, the cost of maintenance is considerable and is higher in some countries than spending on new bridges. The lifetime of welded steel bridges can be significantly extended by aftertreatment of
1309-417: A crossing between Point Oliveros and Point Cires featured deep piers, a length of 14 kilometres (9 miles), 910-metre-tall (3,000 ft) towers, and a 5,000-metre (16,000-foot) span , more than twice the length of the current longest bridge span. According to OPAC this bridge would have cost around US$ 15 Billion. A 2004 proposal by architect Eugene Tsui was for a floating and submerged bridge connected at
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#17328757049901428-399: A different site, and re-used. They are important in military engineering and are also used to carry traffic while an old bridge is being rebuilt. Movable bridges are designed to move out of the way of boats or other kinds of traffic, which would otherwise be too tall to fit. These are generally electrically powered. The Tank bridge transporter (TBT) has the same cross-country performance as
1547-594: A few will predominate. The separation of forces and moments may be quite clear. In a suspension or cable-stayed bridge , the elements in tension are distinct in shape and placement. In other cases the forces may be distributed among a large number of members, as in a truss. The world's longest beam bridge is Lake Pontchartrain Causeway in southern Louisiana in the United States, at 23.83 miles (38.35 km), with individual spans of 56 feet (17 m). Beam bridges are
1666-564: A form of boardwalk across marshes ; examples of such bridges include the Sweet Track and the Post Track in England, approximately 6000 years old. Ancient people would also have used log bridges consisting of logs that fell naturally or were intentionally felled or placed across streams. Some of the first human-made bridges with significant span were probably intentionally felled trees. Among
1785-640: A former network of roads, designed to accommodate chariots , between the fort of Tiryns and town of Epidauros in the Peloponnese , in southern Greece . Dating to the Greek Bronze Age (13th century BC), it is one of the oldest arch bridges still in existence and use. Several intact, arched stone bridges from the Hellenistic era can be found in the Peloponnese. The greatest bridge builders of antiquity were
1904-472: A high-level bilateral meeting between Spain and Morocco, the Moroccan and Spanish governments resolved to relaunch the project for an undersea railway tunnel under the Strait of Gibraltar. The project is planned to start construction in 2030. In June 2023, the Spanish government announced a €2.3 million funding package for a joint Spanish-Moroccan design and planning committee for the tunnel. The tunnel would connect
2023-596: A minimum in the meantime. As of March 2023 , talks remain stalled, with Spain insisting that its Policía Nacional control entry into the Schengen area and the UK demanding that the work be done by officers of the European Union agency Frontex . All other entry points to the Schengen area are controlled by national authorities, supplemented by Frontex in some places. Gibraltar's territory covers 6.8 km2 (2.6 sqmi) and shares
2142-524: A place of religious and symbolic importance. The Phoenicians were present for several centuries since around 950 BC, apparently using Gorham's Cave as a shrine to the genius loci , as did the Carthaginians and Romans after them. Gibraltar was known as Mons Calpe , a name perhaps of Phoenician origin. Mons Calpe was considered by the ancient Greeks and Romans as one of the Pillars of Hercules , after
2261-526: A potential agreement that would see them sharing sovereignty over Gibraltar. The government of Gibraltar organised a referendum on the plan, and 99% of the population voted to reject it. In 2008, the British government committed to respecting the Gibraltarians' wishes. A new Constitution Order was approved in referendum in 2006. A process of tripartite negotiations started in 2006 between Spain, Gibraltar and
2380-684: A raid in 710, a predominantly Berber army under the command of Tariq ibn Ziyad crossed from North Africa in April 711 and landed somewhere in the vicinity of Gibraltar (though most likely not in the bay or at the Rock itself). Tariq's expedition led to the Islamic conquest of most of the Iberian peninsula . Mons Calpe was renamed Jabal Ṭāriq ( جبل طارق ), "the Mount of Tariq", subsequently corrupted into Gibraltar . In 1160
2499-502: A report by the World Health Organization showed that Gibraltar had the worst air quality in any British territory. The report concentrated on PM10 and PM2.5 pollutants in the air. Gibraltar's economy is dominated by four main sectors: financial services , online gambling , shipping, and tourism, which includes duty-free retail sales to visitors. The British military traditionally dominated Gibraltar's economy , with
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#17328757049902618-578: A span of 552 m (1,811 ft). The bridge was opened 29 April 2009, in Chongqing , China. The longest suspension bridge in the world is the 4,608 m (15,118 ft) 1915 Çanakkale Bridge in Turkey. The longest cable-stayed bridge since 2012 is the 1,104 m (3,622 ft) Russky Bridge in Vladivostok , Russia. Some Engineers sub-divide 'beam' bridges into slab, beam-and-slab and box girder on
2737-732: A stream. Often in palaces, a bridge will be built over an artificial waterway as symbolic of a passage to an important place or state of mind. A set of five bridges cross a sinuous waterway in an important courtyard of the Forbidden City in Beijing, China. The central bridge was reserved exclusively for the use of the Emperor and Empress, with their attendants. The estimated life of bridges varies between 25 and 80 years depending on location and material. Bridges may age hundred years with proper maintenance and rehabilitation. Bridge maintenance consisting of
2856-479: A tank even when fully loaded. It can deploy, drop off and load bridges independently, but it cannot recover them. Double-decked (or double-decker) bridges have two levels, such as the George Washington Bridge , connecting New York City to Bergen County , New Jersey , US, as the world's busiest bridge, carrying 102 million vehicles annually; truss work between the roadway levels provided stiffness to
2975-500: A term of up to four years. The unicameral parliament presently consists of 17 elected members, and the Speaker who is not elected but appointed by a resolution of the parliament. The government consists of 10 elected members. The head of state is the British monarch King Charles III , who is represented by the Governor of Gibraltar . The governor enacts day-to-day matters on the advice of
3094-491: A three-mile-wide (4.8 km) floating island in the middle of the Mediterranean Sea . Various tunnels have been proposed. Spain first proposed a modern tunnel under the Strait of Gibraltar in 1930. A major problem arose when the engineers hired by the Spanish government discovered that the material under the Strait was extremely hard rock, making tunnelling impossible with the available technology. One engineering solution
3213-538: A través del Estrecho de Gibraltar SA (SECEGSA). A three-year study for a railway tunnel was announced in 2003. SNED and SECEGSA commissioned several seabed surveys. The Strait is up to 900 metres (3,000 ft) deep on the shortest route, but only about 300 metres deep slightly further west, in a region known as the Camarinal Sill ; the European and African tectonic plates meet around this area. The shortest crossing
3332-643: Is bordered to the north by Spain ( Campo de Gibraltar ). The landscape is dominated by the Rock of Gibraltar , at the foot of which is a densely populated town area, home to some 34,003 people, primarily Gibraltarians . Gibraltar was founded as a permanent watchtower by the Almohads in 1160. It switched control between the Nasrids , Castilians and Marinids in the Late Middle Ages , acquiring larger strategic clout upon
3451-403: Is 14 kilometres (8.7 mi). The proposed route of 23 kilometres (14 mi) is west of Tarifa and to the east of Tangier . The tunnel is likely to be about 34 kilometres (21 miles) in all. It is proposed that a connection would have to be made to the Spanish high speed railway network, which has a line projected to be built from Cádiz to Málaga via Algeciras. A report on the feasibility of
3570-639: Is British government policy not to engage in talks about the sovereignty of Gibraltar without the consent of the people of Gibraltar. Gibraltar was part of the European Union , having joined through the European Communities Act 1972 (UK) , which gave effect to the Treaty of Accession 1972 , as a dependent territory of the United Kingdom under what was then article 227(4) of the Treaty Establishing
3689-456: Is a bridge that carries water, resembling a viaduct, which is a bridge that connects points of equal height. A road-rail bridge carries both road and rail traffic. Overway is a term for a bridge that separates incompatible intersecting traffic, especially road and rail. Some bridges accommodate other purposes, such as the tower of Nový Most Bridge in Bratislava , which features a restaurant, or
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3808-462: Is also historically significant as it is the world's oldest open-spandrel stone segmental arch bridge. European segmental arch bridges date back to at least the Alconétar Bridge (approximately 2nd century AD), while the enormous Roman era Trajan's Bridge (105 AD) featured open-spandrel segmental arches in wooden construction. Rope bridges , a simple type of suspension bridge , were used by
3927-574: Is an early example of a double-decked bridge. The upper level carries a railway, and the lower level is used for road traffic. Other examples include Britannia Bridge over the Menai Strait and Craigavon Bridge in Derry, Northern Ireland. The Oresund Bridge between Copenhagen and Malmö consists of a four-lane highway on the upper level and a pair of railway tracks at the lower level. Tower Bridge in London
4046-485: Is different example of a double-decked bridge, with the central section consisting of a low-level bascule span and a high-level footbridge . A viaduct is made up of multiple bridges connected into one longer structure. The longest and some of the highest bridges are viaducts, such as the Lake Pontchartrain Causeway and Millau Viaduct . A multi-way bridge has three or more separate spans which meet near
4165-417: Is led by architects, bridges are usually designed by engineers. This follows from the importance of the engineering requirements; namely spanning the obstacle and having the durability to survive, with minimal maintenance, in an aggressive outdoor environment. Bridges are first analysed; the bending moment and shear force distributions are calculated due to the applied loads. For this, the finite element method
4284-540: Is needed. Calculating the loading due to congested traffic remains a challenge as there is a paucity of data on inter-vehicle gaps, both within-lane and inter-lane, in congested conditions. Weigh-in-Motion (WIM) systems provide data on inter-vehicle gaps but only operate well in free flowing traffic conditions. Some authors have used cameras to measure gaps and vehicle lengths in jammed situations and have inferred weights from lengths using WIM data. Others have used microsimulation to generate typical clusters of vehicles on
4403-716: Is not a member of the Commonwealth of Nations in its own right and is represented by the United Kingdom but was granted Associate Membership of the Commonwealth Foundation in 2004. Gibraltar has competed in the Commonwealth Games since 1958. As a result of the British Nationality Act 1981 , Gibraltarians were made British Overseas Territories citizens by default, but could apply for registration as
4522-527: Is regarded as having been responsible for setting the old town's style, described by Claire Montado, chief executive of the Gibraltar Heritage Trust, as "military-ordnance-style arched doorways, Italianate stucco relief, Genoese shutters, English Regency ironwork balconies, Spanish stained glass and Georgian sash and casement windows." During the Napoleonic Wars , Gibraltar became a key base for
4641-737: Is the most popular. The analysis can be one-, two-, or three-dimensional. For the majority of bridges, a two-dimensional plate model (often with stiffening beams) is sufficient or an upstand finite element model. On completion of the analysis, the bridge is designed to resist the applied bending moments and shear forces, section sizes are selected with sufficient capacity to resist the stresses. Many bridges are made of prestressed concrete which has good durability properties, either by pre-tensioning of beams prior to installation or post-tensioning on site. In most countries, bridges, like other structures, are designed according to Load and Resistance Factor Design (LRFD) principles. In simple terms, this means that
4760-548: The 1967 Gibraltar sovereignty referendum , which led to the passing of the Gibraltar Constitution Order in 1969. In response, Spain completely closed the border with Gibraltar and severed all communication links. The border with Spain was partially reopened in 1982 and fully reopened in 1985 before Spain's accession to the European Community . In the early 2000s, Britain and Spain were in negotiations over
4879-646: The Almohad Sultan Abd al-Mu'min ordered that a permanent settlement, including a castle, be built. It received the name of Medinat al-Fath (City of the Victory). The Tower of Homage of the Moorish Castle remains standing today. From 1274 onwards, the town was fought over and captured by the Nasrids of Granada (in 1237 and 1374), the Marinids of Fez (in 1274 and 1333) and the kings of Castile (in 1309). Upon
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4998-539: The Azores–Gibraltar Transform Fault , bisects the Strait, and severe earthquakes have occurred in the area. The presence of two deep Quaternary clay channels in the middle of the Strait makes construction complex, causing doubts about the feasibility of the project and proposals for an exploratory tunnel. No official figures about the cost of the project had been announced by 2007, but previous estimates exceeded €5 billion. In February 2023, after
5117-571: The Emirate of Granada . After the conquest, Henry IV of Castile assumed the additional title of King of Gibraltar , establishing it as part of the comarca of the Campo Llano de Gibraltar . Six years later, Gibraltar was restored to the Duke of Medina Sidonia, who sold it in 1474 to a group of 4,350 conversos (Christian converts from Judaism) from Cordova and Seville and in exchange for maintaining
5236-730: The European Parliament as part of the South West England constituency . On 23 June 2016 Gibraltar voted along with the United Kingdom in the EU referendum ; 96% of its population voted to remain, but the overall United Kingdom result gave a 51.9% majority to leaving the EU. Nevertheless, Spanish Prime Minister Pedro Sánchez stated on 18 October 2018 that the Gibraltar protocol had been "resolved" and that Spain will hold no objection when Gibraltar leaves
5355-476: The Eurotunnel Folkestone Terminal and Eurotunnel Calais Terminal at either end of the Channel Tunnel , might be required for transshipment of road vehicles. Car ferries have long operated across the Strait of Gibraltar. As of 2023 they operate on these routes: The ferry traffic has an established base of customers, useful to calculate the number of users for a fixed link. "Website of
5474-636: The Grand Alliance , captured the town of Gibraltar on behalf of the Archduke Charles of Austria in his campaign to become King of Spain. Subsequently, most of the population left the town, with many settling nearby. As the Alliance's campaign faltered, the 1713 Treaty of Utrecht was negotiated, which ceded control of Gibraltar to Britain to secure Britain's withdrawal from the war. Unsuccessful attempts by Spanish monarchs to regain Gibraltar were made, with
5593-554: The Greek legend of the creation of the Strait of Gibraltar by Heracles . There is no known archaeological evidence of permanent settlements from the ancient period. They settled at the head of the bay in what is today known as the Campo (hinterland) of Gibraltar . The town of Carteia , near the location of the modern Spanish town of San Roque , was founded by the Phoenicians around 950 BC on
5712-502: The Inca civilization in the Andes mountains of South America, just prior to European colonization in the 16th century. The Ashanti built bridges over streams and rivers . They were constructed by pounding four large forked tree trunks into the stream bed, placing beams along these forked pillars, then positioning cross-beams that were finally covered with four to six inches of dirt. During
5831-669: The Neolithic period have been found in Gibraltar's caves, mostly of types typical of the Almerian culture found elsewhere in Andalusia , especially around the town of Almería , from which it takes its name. There is little evidence of habitation in the Bronze Age when people had largely stopped living in caves. During ancient times, Gibraltar was regarded by the peoples of the Mediterranean as
5950-547: The Progressive Democratic Party (PDP). The PDP was a new party, formed in 2006 and fielded candidates in the 2007 election, but none were elected. The head of government is the Chief Minister (as of December 2011 , Fabian Picardo ). All local political parties oppose any transfer of sovereignty to Spain, instead supporting self-determination . The main UK opposition parties also support this policy, and it
6069-442: The Roman era , as the technology for cement was lost (then later rediscovered). In India, the Arthashastra treatise by Kautilya mentions the construction of dams and bridges. A Mauryan bridge near Girnar was surveyed by James Princep . The bridge was swept away during a flood, and later repaired by Puspagupta, the chief architect of emperor Chandragupta I . The use of stronger bridges using plaited bamboo and iron chain
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#17328757049906188-432: The Royal Navy and played an important role leading up to the Battle of Trafalgar (21 October 1805). Designated one of four Imperial fortresses (along with Halifax, Nova Scotia , Bermuda , and Malta ), its strategic location made it a key base during the Crimean War of 1854–1856. In the 18th century, the peacetime military garrison fluctuated in numbers from a minimum of 1,100 to a maximum of 5,000. The first half of
6307-436: The University of Minnesota ). Likewise, in Toronto , the Prince Edward Viaduct has five lanes of motor traffic, bicycle lanes, and sidewalks on its upper deck; and a pair of tracks for the Bloor–Danforth subway line on its lower deck. The western span of the San Francisco–Oakland Bay Bridge also has two levels. Robert Stephenson 's High Level Bridge across the River Tyne in Newcastle upon Tyne , completed in 1849,
6426-490: The ancient Romans . The Romans built arch bridges and aqueducts that could stand in conditions that would damage or destroy earlier designs, some of which still stand today. An example is the Alcántara Bridge , built over the river Tagus , in Spain. The Romans also used cement, which reduced the variation of strength found in natural stone. One type of cement, called pozzolana , consisted of water, lime , sand, and volcanic rock . Brick and mortar bridges were built after
6545-403: The narrow entrance and exit to the Mediterranean Sea , the Strait of Gibraltar , with half the world's seaborne trade passing through it. The sovereignty of Gibraltar is a point of contention in Anglo-Spanish relations as Spain asserts a claim to the territory . Gibraltarians overwhelmingly rejected proposals for Spanish sovereignty in a 1967 referendum , and for shared sovereignty in
6664-408: The naval dockyard providing the bulk of economic activity. This, however, has diminished over the last 20 years and is estimated to account for only 7 per cent of the local economy, compared to over 60 per cent in 1984. The territory also has a small manufacturing sector, representing a bit less than 2 per cent of the economy. Gibraltar's labour market employs around thirty thousand workers, 80% in
6783-432: The river Severn . With the Industrial Revolution in the 19th century, truss systems of wrought iron were developed for larger bridges, but iron does not have the tensile strength to support large loads. With the advent of steel, which has a high tensile strength, much larger bridges were built, many using the ideas of Gustave Eiffel . In Canada and the United States, numerous timber covered bridges were built in
6902-432: The siege of 1727 , and again with the Great Siege of Gibraltar (1779 to 1783), during the American War of Independence . After the destructive Great Siege, the town was almost entirely rebuilt. Giovanni Maria Boschetti, who arrived in Gibraltar in 1784 as a 25-year-old from Milan, where he is thought to have been a stonemason or engineer, built the Victualling Yard (completed in 1812) and many other buildings. Boschetti
7021-404: The 18th century, there were many innovations in the design of timber bridges by Hans Ulrich Grubenmann , Johannes Grubenmann , as well as others. The first book on bridge engineering was written by Hubert Gautier in 1716. A major breakthrough in bridge technology came with the erection of the Iron Bridge in Shropshire, England in 1779. It used cast iron for the first time as arches to cross
7140-443: The 19th century saw a significant increase of population to more than 17,000 in 1860, as people from Britain and all around the Mediterranean – Italian, Portuguese, Maltese, Jewish and French – took up residence in the town. Its strategic value increased with the opening of the Suez Canal , as it lay on the sea route between the UK and the British Empire east of Suez. In the later 19th century, major investments were made to improve
7259-587: The 8th-century North African military leader Tariq ibn Ziyad , who began the Muslim conquest of the Iberian Peninsula via the Strait of Gibraltar in 711). Evidence of Neanderthal habitation in Gibraltar from around 50,000 years ago has been discovered at Gorham's Cave . The caves of Gibraltar continued to be used by Homo sapiens after the final extinction of the Neanderthals. Stone tools, ancient hearths and animal bones dating from around 40,000 years ago to about 5,000 years ago have been found in deposits left in Gorham's Cave. Numerous potsherds dating from
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#17328757049907378-416: The EU continued unchanged until the end of 2020 when it was replaced by the EU–UK Trade and Cooperation Agreement . On 31 December 2020, the UK and Spain agreed in principle on a basis for the EU and the UK to negotiate an agreement through which Gibraltar would participate in the Schengen Area , to avoid a hard border with Spain. The arrangements have not entered into force. In 2022, Gibraltar launched
7497-422: The EU with Britain. Gibraltar was nominated to be included on the United Nations list of non-self-governing territories by the United Kingdom when the list was created in 1946 and has been listed ever since. The government of Gibraltar has actively worked to have Gibraltar removed from the list, and in 2008 the British government declared Gibraltar's continued presence on the list an anachronism. Gibraltar
7616-423: The European Community covering special member state territories , with exemption from some areas such as the European Union Customs Union , Common Agricultural Policy and the Schengen Area . It is the only British Overseas Territory which was part of the European Union. After a 10-year campaign for the right to vote in European elections , from 2004 to 2019 the people of Gibraltar participated in elections for
7735-409: The European Union, but is a participant in the EU–UK Trade and Cooperation Agreement . On 31 December 2020, the UK and Spain agreed in principle on a basis for the EU and the UK to negotiate an agreement through which Gibraltar would participate in the Schengen Area , to avoid a hard border with Spain. The arrangements have not entered into force, but both sides aim to keep delays at the border at
7854-452: The Gibraltar Parliament but is responsible to the British government in respect of defence, foreign policy, internal security and general good governance. Judicial and other appointments are made on behalf of the monarch in consultation with the head of the elected government . The 2011 election was contested by the Gibraltar Social Democrats (GSD), Gibraltar Socialist Labour Party (GSLP)- Liberal Party of Gibraltar (LPG) Alliance and
7973-420: The Iberian peninsula because of its position on the Strait of Gibraltar. Rain occurs mainly in winter, with summer being generally dry. Its average annual temperature is 21.7 °C (71.1 °F) as a daily high and 15.8 °C (60.4 °F) as the overnight low. In the coldest month, January, the high temperature averages 16.3 °C (61.3 °F) and the overnight low averages 11.2 °C (52.2 °F) and
8092-474: The Nasrid destruction and abandonment of Algeciras c. 1375 and Nasrids' procurement of Gibraltar away from Marinids in 1375, the Nasrids favoured Gibraltar (a worse natural harbor than Algeciras but featuring better defence capabilities) as a military and urban outpost in the Strait, although Gibraltar did not ever reach a large population during this period. In 1462, Gibraltar was captured by Juan Alonso de Guzmán, 1st Duke of Medina Sidonia , from
8211-423: The Rock before British control, having possibly been introduced during the Islamic period. A superstition analogous to that of the ravens at the Tower of London states that if the apes ever leave, so will the British. In 1944, British Prime Minister Winston Churchill was so concerned about the dwindling population of apes that he sent a message to the Colonial Secretary requesting that something be done about
8330-434: The Rock. Gibraltar is the only place in Europe where the Gibraltar candytuft ( Iberis gibraltarica ) is found growing in the wild; the plant is otherwise native to North Africa. It is the symbol of the Upper Rock nature reserve . Olive and pine trees are among the most common of those growing around the Rock. Most of the Rock's upper area is covered by a nature reserve which is home to around 230 Barbary macaques ,
8449-428: The Spanish government-funded corporation whose job is to study and promote the crossing. In December 2003, Spain and Morocco agreed to explore the construction of an underwater rail tunnel to connect their rail systems. The tunnel would have linked Cape Malabata near Tangier with Punta Paloma in the El Estrecho Natural Park 40 kilometres (25 mi) west of Gibraltar . In late 2006, Lombardi Engineering Ltd ,
8568-561: The UK, ending some restrictions and dealing with disputes in some specific areas such as air movements, customs procedures, telecommunications, pensions and cultural exchange. In the British referendum on membership of the European Union 96% of Gibraltarians voted to remain on an 84% turnout. Spain renewed calls for joint Spanish–British control of the peninsula; these were strongly rebuffed by Gibraltar's Chief Minister. On 18 October 2018, however, Spain seemed to have reached an agreement with
8687-505: The United Kingdom in relation to its objections to Gibraltar leaving the EU with the UK, with Spain's prime minister Pedro Sánchez stating, "Gibraltar will no longer be a problem in arriving at a Brexit deal." On 31 January 2020, the UK left the European Union and consequently so did Gibraltar. Under the terms of the transition phase in the Brexit withdrawal agreement , Gibraltar's relationship with
8806-610: The appearance of the bridge can have great importance. Often, this is the case with a large bridge that serves as an entrance to a city, or crosses over a main harbor entrance. These are sometimes known as signature bridges. Designers of bridges in parks and along parkways often place more importance on aesthetics, as well. Examples include the stone-faced bridges along the Taconic State Parkway in New York. Bridges are typically more aesthetically pleasing if they are simple in shape,
8925-613: The attention of the general public in the 1990s by the novel, movie and play The Bridges of Madison County . In 1927, welding pioneer Stefan Bryła designed the first welded road bridge in the world, the Maurzyce Bridge which was later built across the river Słudwia at Maurzyce near Łowicz , Poland in 1929. In 1995, the American Welding Society presented the Historic Welded Structure Award for
9044-463: The average sea temperature is 16 °C (61 °F). In the warmest month, August, the daily high temperature averages 28.4 °C (83.1 °F), the overnight low averages 21.2 °C (70.2 °F), and the average sea temperature is 22 °C (72 °F). Source 3: Meteoclimat (records except February, July and August record lows) Source 4: Time and Date (dew points and humidity) Over 500 different species of flowering plants grow on
9163-596: The basis of their cross-section. A slab can be solid or voided (though this is no longer favored for inspectability reasons) while beam-and-slab consists of concrete or steel girders connected by a concrete slab. A box-girder cross-section consists of a single-cell or multi-cellular box. In recent years, integral bridge construction has also become popular. Most bridges are fixed bridges, meaning they have no moving parts and stay in one place until they fail or are demolished. Temporary bridges, such as Bailey bridges , are designed to be assembled, taken apart, transported to
9282-437: The boreholes is nowadays supplemented by two desalination plants: a reverse osmosis plant, constructed in a tunnel within the rock, and a multi-stage flash distillation plant at North Mole. Gibraltar's terrain consists of the 426 m-high (1,398 ft) Rock of Gibraltar made of Jurassic limestone , and the narrow coastal lowland surrounding it. It contains many tunnelled roads, most of which are still operated by
9401-432: The bridge is constructed and anchored, the material used to make it, and the funds available to build it. The earliest bridges were likely made with fallen trees and stepping stones . The Neolithic people built boardwalk bridges across marshland. The Arkadiko Bridge , dating from the 13th century BC, in the Peloponnese is one of the oldest arch bridges in existence and use. The Oxford English Dictionary traces
9520-437: The bridge to Poland. Bridges can be categorized in several different ways. Common categories include the type of structural elements used, by what they carry, whether they are fixed or movable, and by the materials used. Bridges may be classified by how the actions of tension , compression , bending , torsion and shear are distributed through their structure. Most bridges will employ all of these to some degree, but only
9639-587: The bridge. Gibraltar Gibraltar ( / dʒ ɪ ˈ b r ɔː l t ər / jib- RAWL -tər , Spanish: [xiβɾalˈtaɾ] ) is a British Overseas Territory and city located at the southern tip of the Iberian Peninsula , on the Bay of Gibraltar , near the exit of the Mediterranean Sea into the Atlantic Ocean ( Strait of Gibraltar ). It has an area of 6.8 km (2.6 sq mi) and
9758-439: The center of the bridge. Multi-way bridges with only three spans appear as a "T" or "Y" when viewed from above. Multi-way bridges are extremely rare. The Tridge , Margaret Bridge , and Zanesville Y-Bridge are examples. A bridge can be categorized by what it is designed to carry, such as trains, pedestrian or road traffic ( road bridge ), a pipeline ( Pipe bridge ) or waterway for water transport or barge traffic. An aqueduct
9877-467: The deck is thinner in proportion to its span, the lines of the structure are continuous, and the shapes of the structural elements reflect the forces acting on them. To create a beautiful image, some bridges are built much taller than necessary. This type, often found in east-Asian style gardens, is called a Moon bridge , evoking a rising full moon. Other garden bridges may cross only a dry bed of stream-washed pebbles, intended only to convey an impression of
9996-640: The destruction of nearby Algeciras c. 1375 . It became again part of the Crown of Castile in 1462. In 1704, Anglo-Dutch forces captured Gibraltar from Spain during the War of the Spanish Succession , and it was ceded to Great Britain in perpetuity under the Treaty of Utrecht in 1713. It became an important base for the Royal Navy , particularly during the Napoleonic Wars and World War II , as it controlled
10115-566: The famous "apes" of Gibraltar, which are actually monkeys . These are the only wild apes or monkeys found in Europe. This species, known scientifically as Macaca sylvanus , is listed as endangered by the IUCN Red List and is declining. Three-quarters of the world population live in the Middle Atlas mountains of Morocco . Recent genetic studies and historical documents point to their presence on
10234-623: The fortifications and the port. During the Second World War , most of Gibraltar's civilian population was evacuated , mainly to London, but also to parts of Morocco and Madeira and to Gibraltar Camp in Jamaica . The Rock was strengthened as a fortress . On 18 July 1940, the Vichy French air force attacked Gibraltar in retaliation for the British bombing of the Vichy navy. The naval base and
10353-415: The frontier workers are Spanish nationals. More than half (55 Percent) of the private sector employee jobs are held by persons who are not Gibraltarians or Other British nationalities. The public sector, on the other hand, employs mainly Gibraltarians and other British (90 Percent) As a consequence, according to Fabian Picardo , Chief Minister of Gibraltar, during Brexit negotiations, a frontier which lacked
10472-466: The garrison of the town for two years, after which time they were expelled, returning to their home towns or moving on to other parts of Spain. In 1501, Gibraltar passed back to the Spanish Crown, and Isabella I of Castile issued a Royal Warrant granting Gibraltar the coat of arms that it still uses. In 1704, during the War of the Spanish Succession , a combined Anglo - Dutch fleet, representing
10591-526: The island at a critical time in the face of concentrated air attacks from German and Italian forces. Spanish dictator Francisco Franco 's reluctance to allow the German Army onto Spanish soil frustrated a German plan to capture the Rock, codenamed Operation Felix . In the 1950s, Franco renewed Spain's claim to sovereignty over Gibraltar and restricted movement between Gibraltar and Spain. Gibraltarians voted overwhelmingly to remain under British sovereignty in
10710-485: The lake. Between 1358 and 1360, Rudolf IV, Duke of Austria , built a 'new' wooden bridge across the lake that was used until 1878; it was approximately 1,450 metres (4,760 ft) long and 4 metres (13 ft) wide. On 6 April 2001, a reconstruction of the original wooden footbridge was opened; it is also the longest wooden bridge in Switzerland. The Arkadiko Bridge is one of four Mycenaean corbel arch bridges part of
10829-748: The late 1700s to the late 1800s, reminiscent of earlier designs in Germany and Switzerland. Some covered bridges were also built in Asia. In later years, some were partly made of stone or metal but the trusses were usually still made of wood; in the United States, there were three styles of trusses, the Queen Post, the Burr Arch and the Town Lattice. Hundreds of these structures still stand in North America. They were brought to
10948-427: The load is factored up by a factor greater than unity, while the resistance or capacity of the structure is factored down, by a factor less than unity. The effect of the factored load (stress, bending moment) should be less than the factored resistance to that effect. Both of these factors allow for uncertainty and are greater when the uncertainty is greater. Most bridges are utilitarian in appearance, but in some cases,
11067-401: The military and closed to the general public. Gibraltar has a Mediterranean climate ( Köppen climate classification Csa ), with mild, rainy winters and summers that are very warm to hot and humid, but with very little rainfall. As is the case for nearby Algeciras and Tarifa , summers are significantly cooler and annual temperature more constant than other cities on the southern coast of
11186-612: The narrowest part of the strait, but this idea was dismissed as the tunnel would be 900 metres (3,000 ft) below sea level. For comparison, the currently deepest undersea tunnel, the Norwegian Ryfylke Tunnel , is 291 metres (955 ft) below sea level. A tunnel deeper than Ryfylke is under construction, also in Norway; Rogfast will be 27 kilometres (17 mi) long and 392 metres (1,286 ft) deep, expected to be completed in 2028–29. The construction of terminals, similar to
11305-403: The necessary fluidity for people to be able to access their places of work would put directly at risk nearly half of the jobs of the Gibraltar workforce. In the early 2000s, many bookmakers and online gaming operators moved to Gibraltar to benefit from operating in a regulated jurisdiction with a favourable corporate tax regime. This corporate tax regime for non-resident controlled companies
11424-616: The oldest timber bridges is the Holzbrücke Rapperswil-Hurden bridge that crossed upper Lake Zürich in Switzerland; prehistoric timber pilings discovered to the west of the Seedamm causeway date back to 1523 BC. The first wooden footbridge there led across Lake Zürich; it was reconstructed several times through the late 2nd century AD, when the Roman Empire built a 6-metre-wide (20 ft) wooden bridge to carry transport across
11543-495: The origin of the word bridge to an Old English word brycg , of the same meaning. The Oxford English Dictionary also notes that there is some suggestion that the word can be traced directly back to Proto-Indo-European *bʰrēw-. However, they also note that "this poses semantic problems." The origin of the word for the card game of the same name is unknown. The simplest and earliest types of bridges were stepping stones . Neolithic people also built
11662-629: The past, these load models were agreed by standard drafting committees of experts but today, this situation is changing. It is now possible to measure the components of bridge traffic load, to weigh trucks, using weigh-in-motion (WIM) technologies. With extensive WIM databases, it is possible to calculate the maximum expected load effect in the specified return period. This is an active area of research, addressing issues of opposing direction lanes, side-by-side (same direction) lanes, traffic growth, permit/non-permit vehicles and long-span bridges (see below). Rather than repeat this complex process every time
11781-405: The path underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually something that is otherwise difficult or impossible to cross. There are many different designs of bridges, each serving a particular purpose and applicable to different situations. Designs of bridges vary depending on factors such as the function of the bridge, the nature of the terrain where
11900-419: The principles of Load and Resistance Factor Design . Before factoring to allow for uncertainty, the load effect is generally considered to be the maximum characteristic value in a specified return period . Notably, in Europe, it is the maximum value expected in 1000 years. Bridge standards generally include a load model, deemed to represent the characteristic maximum load to be expected in the return period. In
12019-526: The private sector and 20% in the public sector. The unemployment rate is extremely low, at around 1 per cent. More than half (53 Percent) of the labour force are resident in Spain or are non Gibraltarians. According to the Government of Gibraltar's statistics, around 45 Percent of the total employee jobs, and 58% of the private sector jobs, are held by frontier workers (employees who are normally resident in Spain but are employed in Gibraltar). Around 63 Percent of
12138-475: The private sector. Since Brexit , Gibraltar is not a member of the European Union but negotiations are under way to have it participate in the Schengen Agreement to facilitate border movements between Gibraltar and Spain. As of March 2023 , talks seem deadlocked. The name is derived from Arabic : جبل طارق , romanized : Jabal Ṭāriq , lit. 'Mount of Tariq' (named after
12257-408: The project of the fixed link through the Strait of Gibraltar" . Archived from the original on 16 May 2007 . Retrieved 3 February 2009 . 35°57′55″N 5°34′24″W / 35.96528°N 5.57333°W / 35.96528; -5.57333 Bridge A bridge is a structure built to span a physical obstacle (such as a body of water , valley , road, or railway) without blocking
12376-742: The roadways and reduced movement of the upper level when the lower level was installed three decades after the upper level. The Tsing Ma Bridge and Kap Shui Mun Bridge in Hong Kong have six lanes on their upper decks, and on their lower decks there are two lanes and a pair of tracks for MTR metro trains. Some double-decked bridges only use one level for street traffic; the Washington Avenue Bridge in Minneapolis reserves its lower level for automobile and light rail traffic and its upper level for pedestrian and bicycle traffic (predominantly students at
12495-698: The same year, has the span of 90 m (295 ft) and crosses the valley of the Syrabach River. The difference between the two is that the Solkan Bridge was built from stone blocks, whereas the Friedensbrücke was built from a mixture of crushed stone and cement mortar. The world's largest arch bridge is the Chaotianmen Bridge over the Yangtze River with a length of 1,741 m (5,712 ft) and
12614-501: The settlements of Sandy Bay and Catalan Bay ; and the Westside , where the vast majority of the population lives. Gibraltar has no administrative divisions but is divided into seven Major Residential Areas . Having negligible natural resources and few natural freshwater resources, limited to natural wells in the north, until recently Gibraltar used large concrete or natural rock water catchments to collect rainwater. Fresh water from
12733-512: The ships based there played a key role in the provisioning and supply of the island of Malta during its long siege . As well as frequent short runs, known as "Club Runs", towards Malta to fly off aircraft reinforcements (initially Hurricanes , but later, notably from the USN aircraft carrier Wasp , Spitfires ), the critical Operation Pedestal convoy was run from Gibraltar in August 1942. This resupplied
12852-637: The simplest and oldest type of bridge in use today, and are a popular type. Some cantilever bridges also have a smaller beam connecting the two cantilevers, for extra strength. The largest cantilever bridge is the 549-metre (1,801 ft) Quebec Bridge in Quebec, Canada. With the span of 220 metres (720 ft), the Solkan Bridge over the Soča River at Solkan in Slovenia is the second-largest stone bridge in
12971-626: The site of an early settlement of the native Turdetani people. After the collapse of the Western Roman Empire , Gibraltar came briefly under the control of the Vandals , who crossed into Africa at the invitation of Boniface , the Count (or commander) of the territory. The area later formed part of the Visigothic Kingdom of Hispania for almost 300 years, from 414 until 711 AD. Following
13090-509: The situation. Other mammals found in Gibraltar include rabbits, foxes and bats. Dolphins and whales are frequently seen in the Bay of Gibraltar . Migrating birds are very common and Gibraltar is home to the only Barbary partridges found on the European continent. In 1991, Graham Watson, Gibraltar's MEP , highlighted conservationists ' fears that urban development , tourism and invasive plant species were threatening Gibraltar's own plants as well as birds and bat species . In May 2016,
13209-448: The southern end of Spain's national high-speed train network with the northern end of the recently constructed Al Boraq high-speed line from Casablanca to Tangiers—the first high-speed rail line in Africa. The proposed rail tunnel's length is 40 kilometres (25 mi), 300 metres (980 ft) deep, and its construction would take 15 years. An earlier plan was to link the two continents via
13328-514: The tunnel was presented to the EU in 2009. A further project study is under development by a group of specialist consultants from SYSTRA , Amberg and COWI . The political origins of the project arise from the Common Hispanic-Moroccan Declaration of Fez, of 16 June 1979, and signed by the kings of Spain and Morocco. One consequence of the declaration was the creation in 1981 (43 years ago) ( 1981 ) of SECEGSA,
13447-740: The undertimbers of bridges all around the world are spots of prevalent graffiti. Some bridges attract people attempting suicide, and become known as suicide bridges . The materials used to build the structure are also used to categorize bridges. Until the end of the 18th century, bridges were made out of timber, stone and masonry. Modern bridges are currently built in concrete, steel, fiber reinforced polymers (FRP), stainless steel or combinations of those materials. Living bridges have been constructed of live plants such as Ficus elastica tree roots in India and wisteria vines in Japan. Unlike buildings whose design
13566-433: The weld transitions . This results in a potential high benefit, using existing bridges far beyond the planned lifetime. While the response of a bridge to the applied loading is well understood, the applied traffic loading itself is still the subject of research. This is a statistical problem as loading is highly variable, particularly for road bridges. Load Effects in bridges (stresses, bending moments) are designed for using
13685-448: The world and the longest railroad stone bridge. It was completed in 1905. Its arch, which was constructed from over 5,000 tonnes (4,900 long tons; 5,500 short tons) of stone blocks in just 18 days, is the second-largest stone arch in the world, surpassed only by the Friedensbrücke (Syratalviadukt) in Plauen , and the largest railroad stone arch. The arch of the Friedensbrücke, which was built in
13804-500: Was phased out by January 2011 and replaced by a still favourable fixed corporate tax rate of 10 per cent. Tourism is also a significant industry. Gibraltar is a popular port for cruise ships and attracts day visitors from resorts in Spain. The Rock is a popular tourist attraction, particularly among British tourists and residents in the southern coast of Spain. It is also a popular shopping destination, and all goods and services are VAT free, but may be subject to Gibraltar taxes. Many of
13923-603: Was reported that the United Kingdom and Morocco would discuss building the crossing between Gibraltar and Tangiers . As of 2023, the completion of Morocco's first national high-speed rail line from Casablanca to Tangiers has led to renewed interest in a tunnel that would connect the line to Spain's own high-speed network , which uses the same gauge and electrification as the northern section of Morocco's Casablanca-Tangier high-speed line. Several engineers have designed bridges on various alignments and with differing structural configurations. A proposal by Professor T.Y. Lin for
14042-504: Was to fix, using cables, a prefabricated concrete tunnel to the floor of the Strait. This tunnel would handle automotive and train traffic. A 2008 geological study cast doubt on the tunnel's feasibility. In March 2009, a contract was issued for a joint system linking the Moroccan Société Nationale d'Etudes du Détroit de Gibraltar (SNED) with its Spanish counterpart, Sociedad española de estudios para la comunicación fija
14161-665: Was visible in India by about the 4th century. A number of bridges, both for military and commercial purposes, were constructed by the Mughal administration in India. Although large bridges of wooden construction existed in China at the time of the Warring States period , the oldest surviving stone bridge in China is the Zhaozhou Bridge , built from 595 to 605 AD during the Sui dynasty . This bridge
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