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117-635: State Route 71 ( SR 71 ) is a 15-mile (24 km) state highway in the U.S. state of California . Serving Riverside , San Bernardino , and Los Angeles counties, it runs from SR 91 in Corona to the Kellogg Interchange with I-10 and SR 57 on the border of Pomona and San Dimas . The segment from SR 91 to SR 83 in Chino Hills is called the Corona Freeway , formerly

234-523: A sovereign state or country. By this meaning a state highway is a road maintained and numbered by the national government rather than local authorities. Australia 's important urban and inter-regional routes not covered by the National Highway or National Route systems are marked under the State Route system. They can be recognised by blue shield markers. They were practically adopted in all states by

351-537: A bypass of the Phoenix area for long-distance travelers on I-10. In 2014, I-8 had an AADT of 5,200 vehicles between Butterfield Trail and Freeman Road, and 44,400 vehicles between SR 280 and Araby Road east of Yuma, the latter of which was the highest AADT for the highway in Arizona. In the early 2010s, I-8 from Casa Grande to Gila Bend was sometimes used for smuggling both drugs and humans. The I-8 designation

468-583: A center barrier installed in the median. The Ocean Beach Freeway section west of I-5 was authorized as Route 286 in 1959. In 1962, four alternate routes were proposed for this part of the freeway, and for Rosecrans Street. Route 286 was renumbered to SR 109 in the 1964 renumbering. Plans for the Old Town interchange between I-5 (formerly US 101), I-8 (formerly US 80), SR 209 (Rosecrans Street), and SR 109 date from 1962, although several concerns had to be taken into account, including

585-534: A conveyor belt across US 80 to become part of an embankment for the Sweetwater River Bridge , the grading of the mountain near Viejas Grade and the Sweetwater River had not been completed on the final link. The historic Ellis Grade radiator stop was to be removed and replaced with one at Vista Point. On April 19, 1969, the part 2.5 mi (4.0 km) east of Alpine opened to traffic. All of

702-581: A different routing through Devil's Canyon that had been constructed by November 1963. A contract for paving the 9.7 miles (15.6 km) from the San Diego–Imperial county line to SR 98, including the eastbound lanes, was given to the Isbell Construction Company for $ 3.69 million (about $ 28 million in 2023 dollars) in May 1963. This portion was completed in May 1965 "through some of

819-503: A flood eroded 400 pieces of the roadway from westbound I-8 near Ocotillo , resulting in the construction of a detour. The freeway reopened to traffic in February 1978 after the damage was repaired and a new bridge was built, at a cost of $ 1 million (about $ 4 million in 2023 dollars). But, in 1982, the freeway was closed again near Ocotillo due to flooding following another storm. Between Yuma and Gila Bend, I-8 runs alongside

936-579: A freeway in 1960, and the freeway was complete west of El Cajon by April 1962. Priority was given to planning US 80 in 1962 by the California Chamber of Commerce . In 1964, I-8 was officially designated by the California State Legislature, and the US 80 designation was removed. By 1965, I-8 from Fairmount Avenue to El Cajon Boulevard was one of the first freeway stretches in the county to have

1053-491: A full eight-lane freeway. This project is underway and is expected to be fully complete by 2027. Additionally, the Riverside County Transportation Commission is constructing a two-lane flyover ramp between eastbound SR 91 and northbound SR 71 to replace the current one-lane loop ramp. Except where prefixed with a letter, postmiles were measured on the road as it was in 1964 , based on

1170-481: A million pounds of dynamite. The third project was built near the site of an abandoned attempt to build a tunnel for the old highway after World War II, which proved to be too expensive. By mid-February 1969, one segment of the freeway running through Alpine was nearing completion and was scheduled to open on February 21; another section was scheduled to open in April. However, although dirt and rocks were transported on

1287-475: A named route branch) Trans-Canada route marker is co-signed with a numbered provincial sign, with the provincial route often continuing alone outside the Trans-Canada Highway section. However, in the western provinces, the two parallel Trans-Canada routes are consistently numbered with Trans-Canada route markers; as Highways 1 and 16 respectively. Canada also has a designated National Highway System , but

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1404-526: A population of at least 10,000 inhabitants are urban roads (type D and E) under the jurisdiction of the relevant municipalities. The state highway that cross towns or villages with a population of less than 10,000 inhabitants are urban roads (type D and E) under the jurisdiction of the municipality, subject to authorization from ANAS . State highways in India are numbered highways that are laid and maintained by state governments . Mexico 's State Highway System

1521-484: A project. This was projected to be the final highway project before I-5 was completed in San Diego County. The building phase started on September 22, 1966, on the interchange that was to replace the intersection of Pacific Highway and Rosecrans Street. The cost of the interchange was projected to be $ 10.86 million (about $ 76 million in 2023 dollars). SR 109 was planned to follow Camino del Rio up to

1638-608: A three-digit number designation, preceded by D . Provincial roads ( Turkish : İl yolu ) are secondary roads, maintained by respective local governments with the support of the KGM. The roads have a four-digit numbering grouped as two pairs, pairs are separated by a dash. First pair represents the license number of that province . State highways are generally a mixture of primary and secondary roads, although some are freeways (for example, State Route 99 in California, which links many of

1755-584: A west-to-east alignment (including its original eastern segment that extended through Temecula and Anza ), and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers to an overlap due to a correction or change, and T indicates postmiles classified as temporary ( for a full list of prefixes, see California postmile § Official postmile definitions ). Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines;

1872-732: Is 100 km/h, with reductions when one passes through a densely populated area. The highways in New Zealand are all state highways, and the network consists of SH 1 running the length of both main islands, SH 2–5 and 10–58 in the North Island, and SH 6–8 and 60–99 in the South Island. National and provincial highways are numbered approximately north to south. State Highway 1 runs the length of both islands. Local highways ( Korean :  지방도 ; Hanja :  地方道 ; RR :  Jibangdo ; MR :  Chipangdo ) are

1989-482: Is a system of urban and state routes constructed and maintained by each Mexican state. The main purpose of the state networks is to serve as a feeder system to the federal highway system. All states except the Federal District operate a road network. Each state marks these routes with a white shield containing the abbreviated name of the state plus the route number. New Zealand state highways are national highways –

2106-424: Is divided into provinces and territories, each of which maintains its own system of provincial or territorial highways, which form the majority of the country's highway network. There is also the national transcontinental Trans-Canada Highway system, which is marked by distinct signs, but has no uniform numeric designation across the country. In the eastern provinces, for instance, an unnumbered (though sometimes with

2223-404: Is free to choose a different marker, and most states have. States may choose a design theme relevant to its state (such as an outline of the state itself) to distinguish state route markers from interstate, county, or municipal route markers. Interstate 8#San Diego to Arizona border Interstate 8 ( I-8 ) is an Interstate Highway in the southwestern United States . It runs from

2340-563: Is not a road class. The Strade Statali , abbreviated SS, is the Italian national network of state highways. The total length for the network is about 25.000 km (15.534 mi). The Italian state highway network are maintained by ANAS . From 1928 until 1946 state highways were maintained by Azienda Autonoma Statale della Strada (AASS). The next level of roads below Strada Statali is Strada Regionale ("regional roads"). The routes of some state highways derive from ancient Roman roads , such as

2457-731: Is paralleled by the San Diego Trolley Green Line . East of El Cajon, it ascends into the mountains and the Cleveland National Forest , traveling through towns such as Alpine then going by the Viejas Casino before reaching Pine Valley . This route achieves four 4,000-foot (1219.2 meters) high points at Carpenter Summit , then crosses the Pine Valley Creek Bridge before the Laguna Summit , followed by

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2574-846: Is part of the National Highway System , a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration . SR 71 is eligible for the State Scenic Highway System ; however, it is not designated as a scenic highway by Caltrans. The original routing of SR 71, according to the 1934 listing, was from US 80 (now I-8 ), in San Diego north to US 66 (now SR 66 ), near Claremont via Lake Elsinore and Temecula . The route between Claremont/Pomona and Lake Elsinore roughly followed

2691-406: Is vested in the federal states of Germany. Most federal states use the term Landesstraße (marked with 'L'), while for historical reasons Saxony and Bavaria use the term Staatsstraße (marked with 'S'). The appearance of the shields differs from state to state. The term Land-es-straße should not be confused with Landstraße , which describes every road outside built-up areas and

2808-563: The California Department of Transportation (Caltrans) would sign this freeway segment as State Route 8. As the freeway enters Mission Valley , it continues eastward, bisecting the area known as "Hotel Circle" that has several hotels. I-8 then has interchanges with SR 163 , I-805 , and I-15 . In La Mesa , the route intersects SR 125 , and in El Cajon it intersects with SR 67 . From Mission Valley through El Cajon, it

2925-584: The Colorado River on a bridge into Yuma, Arizona . I-8 is part of the California Freeway and Expressway System and is eligible for the State Scenic Highway System from I-5 to the western junction of SR 98, though it is not an official state scenic highway. It is officially known as the Border Friendship Route from San Diego to the Arizona state line. The Interstate is signed as

3042-757: The Corona Expressway and before then the Temescal Freeway . SR 71 is designated as the Chino Valley Freeway between SR 83 and the Kellogg Interchange. Beginning at its southern terminus, SR 91 in Corona, SR 71 is an expressway for a half-mile when it intersects with Pomona Rincon Road. After this intersection, SR 71 becomes a freeway up to Rio Rancho Road before reverting to an expressway up to Mission Boulevard. (Previously, it

3159-622: The Crestwood Summit , then the Tecate Divide , After the Laguna Summit, the road passes a U.S. border patrol interior checkpoint that was constructed in 1995 near Buckman Springs Road turnoff just east of the summit. However, this resulted in smugglers driving the wrong way on I-8 at high speeds in order to avoid the checkpoint, causing several crashes, even after concrete barriers were installed. The freeway intersects with SR 79 in

3276-696: The Desert View Tower . I-8 then goes through Ocotillo and Coyote Wells before entering the city of El Centro several miles later. In El Centro, I-8 intersects with SR 86 and SR 111 , both north–south routes which connect to I-10 in the Coachella Valley , north of the Salton Sea . SR 115 and SR 98 end at I-8 east of El Centro. The route also has the lowest above-ground elevation of any Interstate at 52 ft (16 m) below sea level near El Centro. The freeway then traverses

3393-561: The Gila Mountains , the eastbound lanes of I-8 cross under the westbound freeway, briefly traveling to the left near Telegraph Pass before reverting. West of Wellton , the highway takes a northeasterly course, paralleling the Gila River and passing to the south of Roll . Through this part of Arizona, I-8 passes along the northern edge of the Barry M. Goldwater Air Force Range and to the south of

3510-661: The Imperial Sand Dunes Recreation Area and intersects with SR 186 leading south to Baja California Norte , Mexico. I-8 runs parallel to the All-American Canal across the desert for roughly 55 mi (89 km). At points in eastern Imperial County, the Mexican border is less than 0.5 mi (0.80 km) south of the Interstate. I-8 then passes through Felicity and Winterhaven before crossing

3627-637: The National Park Service . The entirety of Interstate 8 in California is defined in the California Streets and Highways Code as Route 8 , whose definition in section 308 is as follows : Route 8 is from: (a) Sunset Cliffs Boulevard to Route 5 in San Diego (b) Route 5 in San Diego to Yuma via El Centro. The freeway begins at the intersection of Sunset Cliffs Boulevard and Nimitz Boulevard in San Diego . For its first few miles, it parallels

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3744-466: The San Diego River floodway. Near Old Town San Diego , I-8 intersects with I-5 as well as with Rosecrans Street, the former routing of SR 209 . Even though the freeway west of I-5 is signed with interstate shields, it is not considered a chargeable interstate highway according to Federal Highway Administration route logs, which defines I-8's western terminus at I-5. Under regular circumstances,

3861-609: The Strada statale 7 Via Appia , which broadly follows the route of the Roman road of the same name . Other examples are the Strada statale 1 Via Aurelia ( Via Aurelia ) and the Strada statale 4 Via Salaria ( Via Salaria ). Since the reforms following the birth of the Kingdom of Italy in 1861, the State took charge of the construction and maintenance of a primary network of roads for connections between

3978-633: The Yuma Proving Ground . It keeps a northeastern heading, passing through the community of Dateland , until it reaches Gila Bend . There, the freeway intersects SR 85 heading north to Phoenix and south to the Organ Pipe Cactus National Monument . After leaving Gila Bend, I-8 takes a southeastern course as it passes through the Sonoran Desert National Monument . Exiting the national monument grounds,

4095-523: The Alpine part of I-8 opened on May 22, 1969, after a ribbon-cutting ceremony; yet the Viejas Grade segment was now projected to be completed by 1972. The bridge over the Sweetwater River was under construction by 1970, and the entire segment cost $ 22.1 million (about $ 134 million in 2023 dollars). By May, this segment was estimated to be completed in the later part of that year. The leveling of

4212-471: The California Highway Commission. Construction was underway on the stretch from Seeley to SR 111 by June 1966, and the entire portion through the county was planned for completion by 1968. This 12.2-mile (19.6 km) portion, extending west to Drew Road, was planned for completion by early 1967, at a cost of $ 200 million (about $ 1.4 billion in 2023 dollars); however, by then,

4329-745: The Chino Valley Freeway was built in 1971 from the Kellogg Interchange to SR 60 (the Pomona Freeway). The section from SR 60 to SR 91 (the Riverside Freeway) was completed in March 1998. In September 2008, construction began on the Mission 71 Project in Pomona. A bridge was constructed to allow Mission Boulevard to pass over SR 71, which now has entrance and exit ramps to Mission. Also,

4446-744: The Frontier traffic circle, where the city of San Diego would resume construction; both SR 109 and SR 209 were to be built in the future. The eight-lane freeway was projected to relieve traffic in the Frontier Street area coming from the San Diego Sports Arena . Bidding for the SR ;109 contract was to begin in 1968, after the City Council endorsed the route in December 1967. Completion of both

4563-522: The Holtville portion began at 3:30 a.m. daily during the summer in order to avoid the desert heat. In addition to this, construction of the Highline Canal overpass involved a 120-foot (37 m) steel span that was prefabricated and made of girders that were hoisted into position by barges. The Matich Construction Company attempted to set the world record for laying the most concrete in a day, aided by

4680-636: The Imperial County line was included in the California Highway Commission budget for 1965–1966. A 6.7-mile (10.8 km) extension from Mountain Springs west to what was then known as Road J-35 was given $ 3.3 million (about $ 24 million in 2023 dollars) in funding by the Highway Commission in May 1965. The 10-mile (16 km) section in between this one and the Mountain Springs pass section

4797-635: The Mission Boulevard exit, all aspects of the highway, such as its alignment, lane width, pavement, barriers, and access, 'upgrade' to freeway standards. The section of the highway between Corona and Chino is notorious for thick winter fogs at dawn and dusk, resulting in many automobile collisions when drivers fail to slow down due to reduced visibility. Residents of Los Serranos (now Chino Hills ) recall being awakened by sounds of crinkling bumpers, fenders, and headlights. As this freeway/expressway serves as an important northwest-southeast corridor between

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4914-739: The Ocean Beach Freeway west of I-5. For the entire length within San Diego County and into Imperial County, it is signed as the Kumeyaay Highway, after the local Native American tribe and their traditional trade route which the Interstate follows. Between Old Town and El Cajon, I-8 is called the Mission Valley Freeway. In 2014, I-8 had an annual average daily traffic (AADT) of 11,800 vehicles between Bonds Corner Road and SR 115, as well as between SR 98 and Imperial Highway, and 239,000 vehicles between I-805 and I-15,

5031-557: The cities in the Pomona and San Gabriel valleys (eastern Los Angeles County ) and the cities of western Riverside County , it is heavily traveled. It is used as an alternative to SR 57 (the Orange Freeway) situated to the west and I-15 (the Ontario Freeway) located to the east. When the route runs through Chino Hills and Chino , there is a high-occupancy vehicle lane available for use; however, this carpool lane ends when

5148-404: The cities of the Central Valley , Route 128 in Massachusetts, or parts of Route 101 in New Hampshire). Each state has its own system for numbering and its own marker. The default marker is a white circle containing a black sans serif number (often inscribed in a black square or slightly rounded square), according to the Manual on Uniform Traffic Control Devices (MUTCD). However each state

5265-641: The city of El Centro . Crossing the Colorado River into Arizona , I-8 continues through the city of Yuma across the Sonoran Desert to Casa Grande, in between the cities of Phoenix and Tucson . The first route over the Cuyamaca Mountains was dedicated in 1912, and a plank road served as the first road across the Imperial Valley to Yuma; east of there, the Gila Trail continued east to Gila Bend . These were later replaced by U.S. Route 80 (US 80) across California and part of Arizona, and Arizona State Route 84 (SR 84) between Gila Bend and Casa Grande. The US 80 freeway through San Diego

5382-419: The city. Caltrans engineer Jacob Dekema stated at the time that the four-lane freeway would not be constructed on the US 80 routing due to possible expansion of the Naval Air Facility El Centro . In October 1964, the portion of I-8 between Imperial Avenue in El Centro to SR 111 appeared in the state budget. By December, a route for the part of I-8 just west of the Colorado River was being examined by

5499-447: The date for completion of the freeway had slipped to 1972. The state ordered the building of the portion from west of Coyote Wells to just east of Drew Road in September 1967. The next year, Dekema indicated that the goal was to have I-8 completed by 1973, citing a deadline in order to have the federal government pay for up to ninety percent of the costs; the other freeways in the region were to be delayed because of this. In early 1970,

5616-420: The drivers led to state charges against the two firms as well as five people in August. There were concerns that John Erreca, the state director of public works, had a conflict of interest with Fratianno and did not enforce the law; however, both Transportation Administrator Robert Bradford (upon a request for investigation from then Governor Pat Brown ) and the Federal Bureau of Investigation found that there

5733-430: The end of the 1980s, and in some states, some less important National Routes were downgraded to State Routes. Each state has or had its own numbering scheme, but do not duplicate National Route numbers in the same state, or nearby routes in another state. As with the National Routes and National Highways, State Routes are being phased out in most states and territories in favour of alphanumeric routes. However, despite

5850-434: The fact that Victoria has fully adopted alphanumeric routes in regional areas, state route numbers are still used extensively within the city of Melbourne as a part of its Metropolitan Route Numbering Scheme . Brazil is another country that is divided into states and has state highways. For example, the longest highway in the state of São Paulo , the Rodovia Raposo Tavares , is designated as SP-270 and SP-295 . Canada

5967-494: The federal conviction of mobster Jimmy Fratianno , and a U.S. House of Representatives subcommittee found that the Arizona government had mismanaged financial resources. The route was completed in 1975 through California, and by 1977 through Arizona, though the bridge over the Colorado River was not completed until 1978. Since then, the freeway through San Diego has been widened due to increasing congestion, and another portion in Imperial County had to be rebuilt following damage by

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6084-417: The freeway engineers have hacked two separate roadways not even in sight of each other, but so overpowering in the sheer magnitude of the cuts through the mountains that it is almost impossible to believe human beings could have so overpowered hostile nature ...." Access to the site for construction workers was difficult, and many slopes had to be stabilized. Temperatures reached 120 °F (49 °C) in

6201-545: The freeway uncompleted when built. The drive time from San Diego to El Centro had been reduced to two hours, according to the California Division of Highways. By August 1970, the remainder of the freeway had been funded, with the part from Japatul Valley Road to Laguna Junction costing $ 22 million (about $ 133 million in 2023 dollars), and the Laguna Junction to Crestwood portion costing $ 15 million (about $ 91 million in 2023 dollars). In May 1971, El Centro Mayor Alex Gay requested that passing lanes be added to

6318-522: The freeway was the second highest priority according to the Highway Development Association in May 1963, after the I-5 freeway. Bidding began on the portion from Broadway in El Cajon to Harritt Road in September 1963. This section of the freeway was to parallel US 80 to the south up to Lakeview Road, and then to the north. This portion of the freeway was scheduled to be complete by May 1965. By January 1965, I-8 had been completed from I-5 east to an interchange with Lake Jennings Park Road, just south of

6435-427: The grade resulted in the second highest fill in the state at 360 ft (110 m). The final portion of I-8 in California, between Japatul Valley Road and west of Boulevard, was prioritized in the 1969–1970 state budget. Due to financial concerns, it was announced in September 1968 that the target date for completing the Interstate Highway System would be extended until 1974, from 1972. The missing portion of I-8

6552-410: The highest concrete bridge in the state at the time was to be built at 430 ft (130 m) over Pine Valley Creek on the segment between Japatul Valley Road and Sunrise Highway. The contract came in at $ 22.6 million (about $ 125 million in 2023 dollars), over $ 5 million (about $ 28 million in 2023 dollars) beyond budget due to the difficulty of the bridge construction. All three of

6669-446: The highest ratio of cars to number of lanes worldwide, at 2400 cars per hour. Plans to add another lane to I-8 west from College Avenue to I-15 began in March 1992. Caltrans proposed the installation of a metered traffic signal on I-8 west in Lakeside during 1987, in order to improve traffic flow in the mornings by inserting a short delay before entering San Diego should the rate exceed 2,000 vehicles per hour. However,

6786-540: The highway continues on an easterly bearing to a junction with SR 84 , a highway that parallels I-8 to the north and goes through Casa Grande , while I-8 passes to the south of both Stanfield and Casa Grande. I-8 reaches its eastern terminus southeast of Casa Grande Mountain Park at an interchange with I-10 , which continues north (westbound) to Phoenix , and south (eastbound) to Tucson . The combination of SR 85 between I-10 and I-8 as well as I-8 between SR 85 and I-10 in Casa Grande has been promoted as

6903-461: The interchange and SR 109 was planned for early 1969. An interchange was planned at Midway Drive, and the western end of the freeway was to be at Sunset Cliffs and Nimitz boulevards. The cost of the SR 109 project was estimated to be $ 2.3 million (about $ 15 million in 2023 dollars). The ramp from south I-5 to Camino del Rio opened in February 1968, and a second ramp from southbound I-5 to eastbound I-8 opened in August 1968, with

7020-417: The intersection with Ninth Street was closed. The freeway was extended south to the former intersection at Ninth Street, where it resumes expressway status to the intersection with Old Pomona Road. The construction project was completed in December 2011. The City of Pomona is currently working with Caltrans to convert the rest of SR 71 within its borders from its current status as a four-lane expressway to

7137-421: The latter of which was the highest AADT for the highway in California. I-8 enters Arizona from California at the Colorado River bridge at Yuma. It initially heads south through Yuma until the interchange with US 95 , where the freeway begins to turn to the east and passes through eastern Yuma and Fortuna Foothills , briefly paralleling US 95 and passing through a second border inspection station. In

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7254-598: The latter's intersection with the southern terminus of Harritt Road. At a cost of $ 3.44 million (about $ 25 million in 2023 dollars), the project reduced the grade and curves at what was known as "Tunnel Hill" that hindered the flow of traffic. The part of the freeway from west of Harritt Road to west of Alpine was up for bidding in October 1964, and the Highway Commission set aside $ 2.1 million (about $ 16 million in 2023 dollars) for this 1.6-mile-long (2.6 km) stretch in February 1965. A contract for $ 1.42 million (about $ 10 million in 2023 dollars)

7371-411: The level terrain, but failed to do so after the concrete mixer malfunctioned. That same year, bids for an Arizona plant inspection station near Winterhaven, next to the California agricultural inspection station, were submitted. The last 6.5-mile (10.5 km) part of the California portion, from near Algodones Road to west of the Arizona state line, was to enter the bidding phase in early 1972. I-8

7488-429: The main cities; in 1865 the Lanza law introduced the classification of roads between national, provincial and municipal (see Annex F, art.10) and the Royal Decree of 17 November 1865, n. 2633 listed the first 38 national roads. Italian state highways are identified by a number and a name. In road signs and maps the number is preceded by the acronym SS, an acronym for strada statale ("state road"). The nomenclature of

7605-444: The median is over 1.5 mi (2.4 km) wide. This portion of the road is known for high winds through the canyons that have made driving difficult, sometimes resulting in closure of the freeway; in 1966, the California Highway Patrol estimated that winds blew at speeds of up to 100 mph (160 km/h). The route enters the Imperial Valley, where it intersects with SR 98, a highway leading to Calexico , and passes near

7722-444: The most rugged, hottest sections of San Diego and Imperial counties," according to The San Diego Union . Construction ran into difficulties following concerns regarding potential landslides. The westbound lanes were built first, and temporarily contained both directions of traffic while the old highway was converted into the eastbound lanes. The Los Angeles Times described the stretch east of Mountain Springs as follows: "Through it

7839-516: The national forest before passing through the La Posta and Campo Indian reservations. In Boulevard , I-8 has an interchange with the eastern end of SR 94 . I-8 straddles the San Diego – Imperial county line for a few miles before turning east. At the Mountain Springs/In-Ko-Pah grade, the freeway is routed down two separate canyons— Devils Canyon for westbound traffic and In-Ko-Pah Gorge for eastbound traffic—as it descends 3,000 ft (910 m) in 11 mi (18 km). In places,

7956-417: The nearby neighborhoods (North Ranch Road, Old Pomona Road, and Phillips Drive) may no longer enter or exit northbound due to added barriers in the highway's median. However, until 2021, southbound traffic could use these streets. (North Ranch Road, Old Pomona Road, and Phillips Drive can enter the highway via a stop sign .) These streets have been completely closed to southbound access as of 2021. Just south of

8073-427: The next important roads under the National highways . The number has two, three, or four digits. Highways with two-digit numbers routes are called State-funded local highways. State roads ( Turkish : Devlet yolu ) are primary roads, mostly under the responsibility of General Directorate of Highways (KGM) except in metropolitan city centers where the responsibility falls into the local government. The roads have

8190-424: The objections of Councilman Floyd Morrow, who objected to solving traffic issues by continuing to expand freeways. The cost was estimated to be $ 8 million (about $ 38 million in 2023 dollars). The La Mesa City Council asked the state to modify the interchange with SR 125 in 1974; the original interchange did not allow for access to SR 125 from I-8 east or to I-8 west from SR 125. Widening of

8307-434: The old US 80 bridge, was dedicated on August 18, 1978; this completed I-8 from San Diego to Casa Grande. The Arizona Department of Transportation and the City of Yuma assisted in the planning process. By the time the California portion of the freeway was complete, the average cost was $ 1 million per mile (about $ 4 million in 2023 dollars). The bridge opened on September 20, 1978. The State of California

8424-473: The other side of the freeway was cut off. Plans were put in place to build frontage roads to improve access through the region. The 16-mile (26 km) portion of I-8 bypassing Holtville began construction in December ;1969, and was nearing completion in May 1971, to result in a continuous freeway that connected two existing segments from Crestwood in San Diego County to just west of Winterhaven. It

8541-491: The path of the Butterfield Overland Mail stagecoach line. When the portion between San Diego and Temecula was redesignated US 395 , SR 71 was rerouted to run from Pomona to Aguanga. In 1973, it was cut back to its present terminus in Corona, with the portion between Corona and Temecula becoming I-15 and the portion between Temecula and Aguanga becoming SR 79 and SR 371 . The early section of

8658-572: The portion from SR 125 to El Cajon Boulevard to five lanes in each direction was under way in October. By 1981, the environmental impact report had been completed, and the $ 50 million (about $ 142 million in 2023 dollars) project to add ramps and widen I-8 was awaiting clearance from the Federal Highway Administration . Additional ramps to SR 67 were nearing completion in May ;1985, and were completed to I-15 north in October. In 1986,

8775-502: The portion of the freeway from west of Ogilby Road to east of Algodones Road was under construction, and projections were to have this portion completed by later that year. This $ 5.2 million (about $ 31 million in 2023 dollars) project also included resurfacing the freeway that had already been built through the Colorado Desert Sandhills; this part of the freeway had been built between 1961 and 1965. By this time, it

8892-484: The preservation of historical Old Town and keeping traffic through the area moving during construction. The goal was to begin the process in 1966, and complete the interchange in 1969. There were concerns about a $ 3 million shortfall in funding (about $ 22 million in 2023 dollars) during May 1966, which caused the San Diego Chamber of Commerce Highway Committee to recommend the completion of SR 109 as

9009-480: The process continued, concerns about increased smog from the additional traffic were raised in October 1967. A 3.7-mile (6.0 km) section to the east of Alpine was scheduled to have bidding opened in November of that year, and was to be finished in 1968; this would produce a continuous freeway from San Diego to the eastern terminus of this route. Both of these projects were underway by May 1968. An additional contract

9126-400: The project revamping the SR 125 interchange was under way, at a cost of $ 80 million (about $ 189 million in 2023 dollars); it would add two more lanes to I-8 from Jackson Drive to Fuerte Drive, and allow for SR 125 to be extended north past I-8. By 1977, traffic had reached 172,300 vehicles a day, which had increased by nearly 10 percent over the previous year. It

9243-497: The projects to complete I-8 were projected to be complete by mid-1974. However, in March 1972, it was announced that the La Posta Road portion of the project would be delayed due to budget troubles. By the beginning of 1974, the new projected completion date for I-8 was mid-1975, with 22 mi (35 km) of two-lane highway remaining. The Pine Valley Creek bridge and the segment extending from Japatul Valley Road to Pine Valley

9360-499: The remainder of the project to be completed in summer 1969. The groundbreaking for the Ocean Beach Freeway took place on September 23, 1968, with the estimated completion to take place within 15 months. However, rain in February 1969 delayed many construction projects across the county, including the SR 109 extension. The entire project was completed in September, with the road scheduled to open in October. The routing of SR 109

9477-504: The remaining two-lane part of I-8 in between El Centro and San Diego due to the frequent traffic jams in between Japatul Valley and Crestwood. At this time, this was the only missing link through the mountains. Bidding took place on the $ 16.5 million (about $ 95 million in 2023 dollars) La Posta Road to Crestwood Road and the Japatul Valley Road to Sunrise Highway portions in November 1971. As part of this series of projects,

9594-498: The remnants of Hurricane Kathleen . I-8 is part of the National Highway System , a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration . The freeway from the eastern junction with California State Route 98 (SR 98) to the eastern end is designated as part of the Juan Bautista de Anza National Historic Trail auto tour route, promoted by

9711-405: The route enters Riverside County (to the south) and Los Angeles County (to the north). The route is a four-lane highway between SR 91 and Central Avenue (excluding HOV lanes), a six-lane highway (excluding HOV lanes) from Central Avenue to SR 60 , and again a four-lane highway from SR 60 to I-10/SR 57. SR 71 is part of the California Freeway and Expressway System , and

9828-687: The routes of both the Gila Trail and the Butterfield Overland Mail Company line. The latter was a stagecoach line that went between Tipton, Missouri , and San Francisco, with several stations in between, and was used to transport passengers across the country at 5 mph (8.0 km/h) between 1858 and 1861. In later years, the Southern Pacific Railroad was constructed, paralleling the Gila River east of Fortuna; by 1877,

9945-729: The southern edge of Mission Bay at Sunset Cliffs Boulevard in San Diego, California , almost at the Pacific Ocean, to the junction with I-10 , just southeast of Casa Grande, Arizona . In California, the freeway travels through the San Diego metropolitan area as the Ocean Beach Freeway and the Mission Valley Freeway before traversing the Cuyamaca Mountains and providing access through the Imperial Valley , including

10062-420: The start and end postmiles in each county are given in the county column. State highway Roads maintained by a state or province include both nationally numbered highways and un-numbered state highways. Depending on the state, "state highway" may be used for one meaning and "state road" or "state route" for the other. In some countries such as New Zealand , the word "state" is used in its sense of

10179-631: The state highways managed by ANAS generally follows the SS n scheme, where n is a number ranging from 1 ( Aurelia ) up to 700 (of the Royal Palace of Caserta ) depending on the date of establishment of the state highway. Newly built ANAS roads, not yet classified, are identified by the acronym NSA, an acronym for nuova strada ANAS ("new ANAS road"). State highways can be technically defined as main extra-urban roads (type B road) or as secondary extra-urban roads (type C road). State highways that cross towns with

10296-430: The state put its plans on hold shortly thereafter, following several concerns from the public, and from state senator Jim Ellis. A stagecoach road existed into the 19th century that passed through the mountains east of San Diego. Before the freeway was constructed, the automobile road through the mountains east of San Diego was narrow and wound through the mountains; it was officially dedicated in 1912. This trip

10413-581: The summer and 4 °F (−16 °C) in winter, with winds reaching up to 80 mph (130 km/h). While using nuclear explosions to conduct blasting operations in the Laguna Mountains was considered as a possibility, the proposal was not considered to be practical at the time. Two cables and a hook were used to move girders into place; this was the first use of a cable in Southern California road construction. The portion from Boulevard to near

10530-462: The system is completely unsigned, aside from the Trans-Canada routes. This makes Canada unique in that national highway designations are generally secondary to subnational routes. In Germany , state roads ( Landesstraßen or Staatsstraßen ) are a road class which is ranking below the federal road network ( Bundesstraßen ). The responsibility for road planning, construction and maintenance

10647-401: The tracks were complete to Yuma. Work continued the next year, and, by 1880, the tracks were extended to Tucson from Yuma. This portion of the route of US 80, predecessor of I-8, was originally part of the proposed state system of highways in 1921. By 1926, this section became part of the cross-country highway US 80 . The route was not paved at this time, but was a gravel road along

10764-566: The valley as the main east–west route. Plans for a new freeway across the southernmost reaches of California date from before 1950. The bridge over the Colorado River was replaced in 1956, at a cost of $ 1.2 million, and was in use until 1978, when the I-8 bridge was built. In 1957, the City of El Centro expressed a desire for the new freeway to replace US 80 to be routed along the southern limits of

10881-518: The word "state" in this sense means "government" or "public" (as in state housing and state schools ), not a division of a country. New Zealand's state highway system is a nationwide network of roads covering the North Island and the South Island . As of 2006, just under 100 roads have a "State Highway" designation. The NZ Transport Agency administers them. The speed limit for most state highways

10998-540: Was a two-lane road that still had many switchbacks , with one popularly known as "Dead Man's Curve". Construction of I-8 took place atop much of the roadbed of the highway from the early 1930s. The delay in extending a road to San Diego caused increased development in Los Angeles and resulted in that city becoming the trade and population center of Southern California, according to the San Diego Union . Completion of

11115-602: Was accepted as a chargeable Interstate by the American Association of State Highway Officials in 1957, and was added to the state highway system in 1964 by the California State Legislature ; the US ;80 designation was removed at that time. The freeway that would become I-8 was constructed in the mid-20th century through the San Diego area. The section west of I-5 was originally part of SR 109, and

11232-415: Was added to I-8 in 1972. In later years, the California Department of Transportation (Caltrans) made efforts to widen the freeway as congestion increased. Much of Alvarado Canyon Road from San Diego to La Mesa was originally built between 1947 and 1950, a bypass of the old US 80 routing along El Cajon Boulevard and La Mesa Boulevard. Work began to convert the original US 80 divided highway into

11349-470: Was an expressway until its northern terminus, but this segment was upgraded to a freeway in 2012.) The route becomes a short freeway for about a mile until it meets at the Kellogg Interchange in San Dimas , where it terminates at I-10 and SR 57 . As of December 2016, all traffic signals were removed. Traffic entering and exiting the roads that lead into

11466-421: Was built at a cost of $ 7.4 million (about $ 33 million in 2023 dollars). In June 1975, there were concerns regarding the state delaying new construction projects due to financial concerns, and the effects this would have on the bridge. The bid for the project was awarded to Novo-Rados Construction in October 1975, as one of the final projects before the construction freeze. The new bridge, which replaced

11583-457: Was dedicated on November 24, 1974, and was scheduled to open on November 26; this left 8 mi (13 km) of freeway to be constructed. The final stretch of I-8 in California, from Sunrise Highway to La Posta Road, was completed in May 1975. The Buckman Springs rest area opened in January 1979 in eastern San Diego County. In 1987, the first 65 mph (105 km/h) speed limit sign

11700-464: Was estimated that the bypass would save travelers 20 minutes of travel time through the Imperial Valley. The cost of this project was $ 11.2 million (about $ 71 million in 2023 dollars). However, Holtville residents raised concerns about SR 115 providing the only access to the eastern part of the city, notably the narrow and curved portion leading from the freeway into town. Work on

11817-450: Was estimated that the drive from San Diego to El Centro now took 2 hours, as opposed to the 3.5 hours required two decades earlier, and the two days required in the pioneer era. This part of the freeway was opened in July 1970. As the freeway was constructed through the valley, it caused a break in many north–south roads. These breaks were located where access to the part of the road on

11934-502: Was expected to cost $ 45 million and be constructed in three parts, with one part being started each year. The segments between Japatul Valley Road and west of Laguna Junction, and from La Posta Road to west of Boulevard, were delayed for an entire year at the end of 1969 due to a nationwide effort to fight inflation by reducing spending. A 6.6-mile (10.6 km) segment from Buckman Springs to Crestwood received funding in May 1970, which would leave only an 8-mile (13 km) stretch of

12051-464: Was given out for $ 7.8 million (about $ 52 million in 2023 dollars) in August to continue the freeway east from Alpine Street to Japatul Valley Road; this would bring the freeway near Descanso Junction. Roughly 5.5 million cubic yards (4.2 × 10 ^  m ) of dirt and rock were to be generated by all three of these construction projects, since half of a mountain would have to be removed with

12168-407: Was hoped that the construction of SR 52 would help to reduce the congestion. A revised Mission Gorge Road eastbound exit opened in 1979, merging with traffic from I-15. Traffic reached 212,000 vehicles a day by February 1981, and Caltrans declared I-8 east of I-805 the busiest highway in the region. In 1987, Caltrans determined that I-8 west between College Avenue and Waring Road had

12285-544: Was imprisoned when he did not pay, but was released in September 1969. His ex-wife, Jewell, as well as the company, were fined $ 4,014 (about $ 23,000 in 2023 dollars) individually for their responsibility in the matter. For the state charges, he was sentenced in 1969 to one to three years in prison, after pleading guilty to the charges. He was incarcerated in Chico State Prison following a parole violation until 1973. Following Tropical Storm Kathleen in September 1976,

12402-401: Was in planning by that September, and was scheduled to begin the building phase shortly thereafter, with the section extending west of Boulevard to follow. That section, from Crestwood to Boulevard, was to begin construction soon after the $ 3 million (about $ 22 million in 2023 dollars) contract was given out in January 1966. The coming of the freeway from both west and east of Jacumba

12519-435: Was issued in August 1965. The entire 6-mile (9.7 km) stretch from Lake Jennings Road to Harbison Canyon Road was under construction by September 1965 and was scheduled to be complete by the next year. In the Mountain Springs pass between San Diego and Imperial counties, the eastbound lanes traverse the pass on the former roadbed of US 80 through In-Ko-Pah Gorge near Myers Creek . The westbound lanes were placed on

12636-401: Was known to take up to four hours, and frequently resulted in the radiator boiling over, flat tires, or broken fan belts ; inclement weather would result in cars becoming mired in the mud. The road was paved in 1926, and was open by 1927; remnants of this road were still present in the late 20th century. Another road was built in the early 1930s, to remove curves and widen the lanes. This

12753-401: Was largely complete by the time it was renumbered as I-8 in the 1964 state highway renumbering ; east of San Diego, the US 80 roadway was slowly replaced by I-8 as construction progressed in the Imperial Valley. The Arizona portion of the road was built starting in the 1960s. Several controversies erupted during the construction process; questionable labor practices in Imperial County led to

12870-639: Was no conflict of interest. The truck drivers were given $ 36,000 (about $ 251,000 in 2023 dollars) in back pay from the state government. Fratianno and Bompensiero were charged with fraud, as well as state labor and public utility code violations. While charges were dropped against Bompensiero, Fratianno was found guilty. The Imperial County Board of Supervisors estimated that $ 25,000 (about $ 758,000 in 2023 dollars) in damage to county roads took place due to overloaded trucks. The federal government fined him $ 10,000 (about $ 67,000 in 2023 dollars), which he never paid, and placed him on probation for three years; he

12987-636: Was officially added to I-8 in 1972. Even before the freeway was complete in California, bidding began in 1964 on widening I-8 from six to eight lanes between near Fairmount Avenue and Spring Street, in San Diego and La Mesa. Three years later, a contract was granted for the widening of the Fairmount Avenue to Ward Road stretch, adding two lanes to the freeway. In 1974, the San Diego City Council reached an agreement with state officials to improve I-8 from east of Pacific Highway to Texas Street, over

13104-469: Was posted east of El Cajon, the first one in the state; the speed limit on all I-8 east of El Cajon, except for the Mountain Springs Grade portion, was raised similarly. The highway through Imperial Valley was originally a plank road made of pieces of wood that were tied together. The Ocean-to-Ocean Bridge across the Colorado River was open in 1915. Following this, US 80 was built through

13221-553: Was potentially responsible. Both companies were awarded the contracts to transport dirt during the construction of I-8 in El Centro. Drivers were coerced to agree to buy the trucks, although the Fratianno Company still retained the ownership; they also had portions of their wages withheld from them. Following this, the drivers were loaned money from Leo Moceri, another mafia leader. An investigation in early 1966 after complaints from

13338-453: Was projected to be a significant event in the history of the town. Cafes and gas stations went out of business once the freeway bypassed the town; however, many retirees relocated into the town since the high traffic levels were gone. The labeling of the town Boulevard as Manzanita on I-8 signs raised controversy and forced the Division of Highways to obscure the name on the signs until the issue

13455-422: Was resolved. Construction continued with the issuing of a $ 6.55 million contract (about $ 46 million in 2023 dollars) to widen a 5.7-mile (9.2 km) section of I-8 through Alpine, from Harbison Canyon to east of West Victoria Drive, and to begin construction in April or May 1967, to be completed in 1969. This would leave only a 30-mile (48 km) stretch of I-8 that was not at freeway standards. As

13572-574: Was responsible for the bridge erection, even though the State of Arizona owned half of the bridge. Jimmy Fratianno was associated with Frank Bompensiero , the San Diego mafia leader, in a criminal lawsuit involving the Fratianno Trucking Company and the Miles and Sons Trucking Company in 1966; he was known to law enforcement as "the Mafia's West Coast executioner," with up to 16 deaths for which he

13689-417: Was scheduled to be completed in the summer of 1975 between San Diego and Yuma, although there would be a break in the freeway around Yuma; this occurred by October 1975. At the time the California portion was completed, it was the preferred route to Phoenix from some areas of Los Angeles, since I-10 had not been completed. The missing portion of the highway was the new bridge over the Colorado River, which

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