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79-539: The Tennessee Highway Patrol provides assistance to motorists who need help. It investigates traffic accidents involving property damage , personal injury , or death. The agency works with prosecutors in the prosecution of cases in which the use of drugs or alcohol contributed to accidents causing personal injury or fatalities. In addition to traffic law enforcement, the Tennessee Highway Patrol has responsibility in criminal interdiction, which involves

158-834: A certificate that proves the vehicle is safe and roadworthy . Also, it needs to have a minimum of third party insurance . Drivers may be required to take lessons with an approved driving instructor (or are strongly encouraged to do so) and must pass a driving test before being granted a license. Almost all countries allow all adults with good vision and health to apply to take a driving test and, if successful, to drive on public roads. In many countries, even after passing one's driving test, new drivers are initially subject to special restrictions under graduated driver licensing rules. For example, in Australia, novice drivers are required to carry "P" ("provisional") plates, while in New Zealand it

237-521: A locomobile , to the summit of Mount Washington in New Hampshire in the United States to generate publicity for their automobile. The 7.6-mile (12.2 km) journey took over two hours (not counting time to add more water); the descent was accomplished by putting the engine in low gear and much braking. Driving in traffic is more than just knowing how to operate the mechanisms which control

316-582: A south-pointing chariot , a vehicle with an early form of guidance system. The stagecoach , a four-wheeled vehicle drawn by horses, originated in 13th century England. Railways began reappearing in Europe after the Dark Ages . The earliest known record of a railway in Europe from this period is a stained-glass window in the Minster of Freiburg im Breisgau dating from around 1350. In 1515, Cardinal Matthäus Lang wrote

395-504: A wagonway , a predecessor of the railway, found so far was the 6 to 8.5 km (4 to 5 mi) long Diolkos wagonway, which transported boats across the Isthmus of Corinth in Greece since around 600 BC. Wheeled vehicles pulled by men and animals ran in grooves in limestone , which provided the track element, preventing the wagons from leaving the intended route. In 200 CE, Ma Jun built

474-433: A boost from high altitude winds. Compressed gas is currently an experimental method of storing energy. In this case, compressed gas is simply stored in a tank and released when necessary. Like elastics, they have hysteresis losses when gas heats up during compression. Gravitational potential energy is a form of energy used in gliders, skis, bobsleds and numerous other vehicles that go down hill. Regenerative braking

553-577: A description of the Reisszug , a funicular railway at the Hohensalzburg Fortress in Austria. The line originally used wooden rails and a hemp haulage rope and was operated by human or animal power, through a treadwheel . 1769: Nicolas-Joseph Cugnot is often credited with building the first self-propelled mechanical vehicle or automobile in 1769. In Russia, in the 1780s, Ivan Kulibin developed

632-606: A driver's mental skills. Safety concerns in driving include poor road conditions, low visibility, texting while driving , speeding , impaired driving , sleep-deprived driving , and reckless driving . Laws regarding driving, driver licensing , and vehicle registration vary between jurisdictions. Most countries have laws against driving under the influence of alcohol or other drugs. Some countries impose annual renewals or point systems for driver's licenses to maintain road safety. The World Health Organization estimates that 1.35 million people are killed each year in road traffic; it

711-846: A fact that the New York Times denied in error . Rocket engines can be particularly simple, sometimes consisting of nothing more than a catalyst, as in the case of a hydrogen peroxide rocket. This makes them an attractive option for vehicles such as jet packs. Despite their simplicity, rocket engines are often dangerous and susceptible to explosions. The fuel they run off may be flammable, poisonous, corrosive or cryogenic. They also suffer from poor efficiency. For these reasons, rocket engines are only used when absolutely necessary. Electric motors are used in electric vehicles such as electric bicycles , electric scooters, small boats, subways, trains , trolleybuses , trams and experimental aircraft . Electric motors can be very efficient: over 90% efficiency

790-665: A flight with an actual ornithopter on July 31, 2010. Paddle wheels are used on some older watercraft and their reconstructions. These ships were known as paddle steamers . Because paddle wheels simply push against the water, their design and construction is very simple. The oldest such ship in scheduled service is the Skibladner . Many pedalo boats also use paddle wheels for propulsion. Screw-propelled vehicles are propelled by auger -like cylinders fitted with helical flanges. Because they can produce thrust on both land and water, they are commonly used on all-terrain vehicles. The ZiL-2906

869-546: A focus on truck traffic violations. Troop S in District 3 conducts all the below programs in addition to the D.A.R.E. program : The Special Operations Unit of the Tennessee Highway Patrol consists of four specialized sections: The design of the shoulder patch of the THP is unique, as it is the only State Police shoulder patch to identify the admittance of the state into the Union. Tennessee

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948-423: A gas station. Fuel cells are similar to batteries in that they convert from chemical to electrical energy, but have their own advantages and disadvantages. Electrified rails and overhead cables are a common source of electrical energy on subways, railways, trams, and trolleybuses. Solar energy is a more modern development, and several solar vehicles have been successfully built and tested, including Helios ,

1027-463: A go around is needed. Parachutes are used to slow down vehicles travelling very fast. Parachutes have been used in land, air and space vehicles such as the ThrustSSC , Eurofighter Typhoon and Apollo Command Module . Some older Soviet passenger jets had braking parachutes for emergency landings. Boats use similar devices called sea anchors to maintain stability in rough seas. To further increase

1106-509: A hot exhaust. Trains using turbines are called gas turbine-electric locomotives . Examples of surface vehicles using turbines are M1 Abrams , MTT Turbine SUPERBIKE and the Millennium . Pulse jet engines are similar in many ways to turbojets but have almost no moving parts. For this reason, they were very appealing to vehicle designers in the past; however, their noise, heat, and inefficiency have led to their abandonment. A historical example of

1185-537: A human-pedalled, three-wheeled carriage with modern features such as a flywheel , brake , gear box and bearings ; however, it was not developed further. In 1783, the Montgolfier brothers developed the first balloon vehicle. In 1801, Richard Trevithick built and demonstrated his Puffing Devil road locomotive, which many believe was the first demonstration of a steam-powered road vehicle, though it could not maintain sufficient steam pressure for long periods and

1264-460: A presence in each of Tennessee's 95 counties . The Criminal Investigation Division of the Tennessee Highway Patrol investigates, gathers evidence, and assists federal, state, and local law enforcement, when requested. It also handles background checks for handgun carry permits. The Commercial Vehicle Enforcement Division of the Tennessee Highway Patrol inspects commercial vehicles and driver logs, weighs commercial vehicles, and patrols highways with

1343-584: A solar-powered aircraft. Nuclear power is a more exclusive form of energy storage, currently limited to large ships and submarines, mostly military. Nuclear energy can be released by a nuclear reactor , nuclear battery , or repeatedly detonating nuclear bombs . There have been two experiments with nuclear-powered aircraft, the Tupolev Tu-119 and the Convair X-6 . Mechanical strain is another method of storing energy, whereby an elastic band or metal spring

1422-407: A special arrangement in which all four main wheels can be angled. Skids can also be used to steer by angling them, as in the case of a snowmobile . Ships, boats, submarines, dirigibles and aeroplanes usually have a rudder for steering. On an airplane, ailerons are used to bank the airplane for directional control, sometimes assisted by the rudder. With no power applied, most vehicles come to

1501-411: A stop due to friction . But it is often required to stop a vehicle faster than by friction alone, so almost all vehicles are equipped with a braking system. Wheeled vehicles are typically equipped with friction brakes, which use the friction between brake pads (stators) and brake rotors to slow the vehicle. Many airplanes have high-performance versions of the same system in their landing gear for use on

1580-581: A traumatic brain injury). Some jurisdictions implement road space rationing , where vehicles are banned from driving on certain days depending on a variety of criteria, most commonly the letters and digits in their vehicle registration plate . A few countries banned women driving in the past. In Oman , women were not allowed to drive until 1970. In Saudi Arabia , women were not issued driving licenses until 2018. Saudi women had periodically staged driving protests against these restrictions and in September 2017,

1659-489: A vacuum, which limits their use to spaceborne vehicles. Ion thrusters run primarily off electricity, but they also need a propellant such as caesium , or, more recently xenon . Ion thrusters can achieve extremely high speeds and use little propellant; however, they are power-hungry. The mechanical energy that motors and engines produce must be converted to work by wheels, propellers, nozzles, or similar means. Aside from converting mechanical energy into motion, wheels allow

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1738-422: A variety of conditions. One of the difficulties met when using gas motors is the cooling effect of expanding gas. These engines are limited by how quickly they absorb heat from their surroundings. The cooling effect can, however, double as air conditioning. Compressed gas motors also lose effectiveness with falling gas pressure. Ion thrusters are used on some satellites and spacecraft. They are only effective in

1817-528: A vehicle to roll along a surface and, with the exception of railed vehicles, to be steered. Wheels are ancient technology, with specimens being discovered from over 5000 years ago. Wheels are used in a plethora of vehicles, including motor vehicles, armoured personnel carriers , amphibious vehicles, airplanes, trains, skateboards and wheelbarrows. Nozzles are used in conjunction with almost all reaction engines. Vehicles using nozzles include jet aircraft, rockets, and personal watercraft . While most nozzles take

1896-400: A vehicle's steering through the gyroscopic effect . They have been used experimentally in gyrobuses . Wind energy is used by sailboats and land yachts as the primary source of energy. It is very cheap and fairly easy to use, the main issues being dependence on weather and upwind performance. Balloons also rely on the wind to move horizontally. Aircraft flying in the jet stream may get

1975-405: Is fuel . External combustion engines can use almost anything that burns as fuel, whilst internal combustion engines and rocket engines are designed to burn a specific fuel, typically gasoline, diesel or ethanol . Food is the fuel used to power non-motor vehicles such as cycles, rickshaws and other pedestrian-controlled vehicles. Another common medium for storing energy is batteries , which have

2054-405: Is a high rate of injury and death caused by motor vehicle accidents that involve teenage drivers. There is evidence that the less teenagers drive, the risk of injury drops. There is a lack of evidence as to whether educational interventions to promote active transport and share information about the risks, cost, and stresses involved with driving are effective at reducing or delaying car driving in

2133-519: Is an example of capturing kinetic energy where the brakes of a vehicle are augmented with a generator or other means of extracting energy. When needed, the energy is taken from the source and consumed by one or more motors or engines. Sometimes there is an intermediate medium, such as the batteries of a diesel submarine. Most motor vehicles have internal combustion engines . They are fairly cheap, easy to maintain, reliable, safe and small. Since these engines burn fuel, they have long ranges but pollute

2212-411: Is called restricted (R). Many U.S. states now issue graduated drivers' licenses to novice minors. While graduated driver licensing rules vary between jurisdictions, typical restrictions include newly licensed minors not being permitted to drive or operate a motorized vehicle at night or with a passenger other than family members, zero blood alcohol, and limited power-to-weight ratio of the vehicle. It

2291-478: Is common. Electric motors can also be built to be powerful, reliable, low-maintenance and of any size. Electric motors can deliver a range of speeds and torques without necessarily using a gearbox (although it may be more economical to use one). Electric motors are limited in their use chiefly by the difficulty of supplying electricity. Compressed gas motors have been used on some vehicles experimentally. They are simple, efficient, safe, cheap, reliable and operate in

2370-414: Is deformed and releases energy as it is allowed to return to its ground state. Systems employing elastic materials suffer from hysteresis , and metal springs are too dense to be useful in many cases. Flywheels store energy in a spinning mass. Because a light and fast rotor is energetically favorable, flywheels can pose a significant safety hazard. Moreover, flywheels leak energy fairly quickly and affect

2449-438: Is desirable and important in supplying traction to facilitate motion on land. Most land vehicles rely on friction for accelerating, decelerating and changing direction. Sudden reductions in traction can cause loss of control and accidents. Most vehicles, with the notable exception of railed vehicles, have at least one steering mechanism. Wheeled vehicles steer by angling their front or rear wheels. The B-52 Stratofortress has

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2528-518: Is never empty , a propeller could be made to work in space. Similarly to propeller vehicles, some vehicles use wings for propulsion. Sailboats and sailplanes are propelled by the forward component of lift generated by their sails/wings. Ornithopters also produce thrust aerodynamically. Ornithopters with large rounded leading edges produce lift by leading-edge suction forces. Research at the University of Toronto Institute for Aerospace Studies lead to

2607-418: Is organized into eight districts, which have a district headquarters, a varying number of troops, and county facilities. The table below indicates the district, the troops in each region, the counties in each district and troop, and the locations of the district headquarters and inspection facilities (called scale complexes). With the extensive coverage of THP facilities, the Tennessee Highway Patrol therefore has

2686-423: Is possible for a driver to be suspended or disqualified (banned) from driving, either for a short time or permanently. This is usually in response to a serious traffic offence (for example, causing death due to drink driving), repeated minor traffic offences (for example, accruing too many demerit points for speeding), or for a specific medical condition which prevents driving, pending a future assessment (for example,

2765-577: Is restricted to tip jet helicopters and high speed aircraft such as the Lockheed SR-71 Blackbird . Rocket engines are primarily used on rockets, rocket sleds and experimental aircraft. Rocket engines are extremely powerful. The heaviest vehicle ever to leave the ground, the Saturn V rocket, was powered by five F-1 rocket engines generating a combined 180 million horsepower (134.2 gigawatt). Rocket engines also have no need to "push off" anything,

2844-639: Is the Glock Model 45 chambered in 9x19mm. Also THP troopers wear bulletproof vests under their uniform shirt. Less lethal weapons issued to troopers include OC Pepper Spray and the Expandable Straight Baton.Troopers are also issued the Glock model 43x as a backup weapon. In 2023, the Tennessee Highway Patrol began fielding the Axon Taser X7 for duty use. Since the organization was established, 44 members of

2923-620: Is the leading cause of death for people age 5 to 29. The origin of the term driver , as recorded from the 15th century, refers to the occupation of driving working animals , especially pack horses or draft horses . The verb to drive in origin means "to force to move, to impel by physical force". It is first recorded of electric railway drivers in 1889 and of a motor-car driver in 1896. Early alternatives were motorneer , motor-man , motor-driver or motorist . French favors " conducteur " (the English equivalent, " conductor ", being used—from

3002-497: Is the most-produced helicopter. The top commercial jet airliner is the Boeing 737 , at about 10,000 in 2018. At around 14,000 for both, the most produced trams are the KTM-5 and Tatra T3 . The most common trolleybus is ZiU-9 . Locomotion consists of a means that allows displacement with little opposition, a power source to provide the required kinetic energy and a means to control

3081-485: Is worn at the base of the hat. The THP utilizes a unique duty belt. Instead of the standard 2 + 1 ⁄ 4 -inch-wide (5.7 cm) duty belt worn by most agencies, the THP utilizes a 3-inch-wide (7.6 cm) clarino (Patent High Gloss) leather duty belt, creating a distinctive look. All other accessories on the belt are also clarino and feature hidden snap closures. The belt buckle is silver for troopers and gold for higher ranks. The issued sidearm for THP Troopers

3160-499: The Vienna Convention on Road Signs and Signals standardises road signs, traffic lights and road markings to improve safety. The rules of the road, driver licensing and vehicle registration schemes vary considerably between jurisdictions, as do laws imposing criminal responsibility for negligent driving , vehicle safety inspections and compulsory insurance . Most countries also have differing laws against driving while under

3239-472: The influence of alcohol or other drugs . Aggressive driving and road rage have become problems for drivers in some areas. Some countries require annual renewal of the driver's license. This may require getting through another driving test or vision screening test to get recertified. Also, some countries use a points system for the driver's license. Both techniques (annual renewal with tests, points system) may or may not improve road safety compared to when

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3318-497: The rules of the road . Driving over a long distance is referred to as a road trip . In many countries, knowledge of the rules of the road, both practical and theoretical, is assessed with a driving test(s), and those who pass are issued with a driving license . A driver must have physical skills to be able to control direction, acceleration, and deceleration. For motor vehicles, the detailed tasks include: Avoiding or successfully handling an emergency driving situation can involve

3397-408: The 15th century. Its meaning has changed from primarily driving working animals in the 15th century to automobiles in the 1800s. Driving skills have also developed since the 15th century, with physical, mental and safety skills being required to drive. This evolution of the skills required to drive have been accompanied by the introduction of driving laws which relate not only to the driver but also to

3476-422: The 1830s—not of the driver but of the person in charge of passengers and collecting fares), while German influenced areas adopted Fahrer (used of coach-drivers in the 18th century, but shortened about 1900 from the compound Kraftwagenfahrer ), and the verbs führen , lenken , steuern —all with a meaning "steer, guide, navigate"—translating to conduire . The world's first long-distance road trip by automobile

3555-1129: The Saudi government agreed to lift the ban, which went into effect in June 2018. Land vehicle A vehicle (from Latin vehiculum ) is a machine designed for self- propulsion , usually to transport people, cargo , or both. The term "vehicle" typically refers to land vehicles such as human-powered vehicles (e.g. bicycles , tricycles , velomobiles ), animal-powered transports (e.g. horse-drawn carriages / wagons , ox carts , dog sleds ), motor vehicles (e.g. motorcycles , cars , trucks , buses , mobility scooters ) and railed vehicles ( trains , trams and monorails ), but more broadly also includes cable transport ( cable cars and elevators ), watercraft ( ships , boats and underwater vehicles ), amphibious vehicles (e.g. screw-propelled vehicles , hovercraft , seaplanes ), aircraft ( airplanes , helicopters , gliders and aerostats ) and space vehicles ( spacecraft , spaceplanes and launch vehicles ). This article primarily concerns

3634-518: The Tennessee Highway Patrol became the first police agency in the United States to utilize helicopters in patrol work. The THP is headquartered in Nashville , the state capital. The agency's field operations are organized geographically into eight districts, each with a district headquarters and a varying number of troops (stations that are usually grouped with adjacent counties). As of September 2007,

3713-468: The Tennessee Highway Patrol have died in the line of duty. Motorist Driving is the controlled operation and movement of a land vehicle , including cars , motorcycles , trucks , and buses . A driver's permission to drive on public highways is granted based on a set of conditions being met, and drivers are required to follow the established road and traffic laws in the location they are driving. The word "driving" has etymology dating back to

3792-645: The Tennessee Highway Patrol was authorized to have up to 947 commissioned troopers. The Tennessee Highway Patrol operates six inspection sites around the state, in Districts 1, 2, 3, 4, 5, and 7. The Tennessee Highway Patrol's enforcement activities at the inspection sites, also called scale complexes, include inspections of commercial vehicles and driver logs , highway patrols with a focus on traffic violations by trucks, and weighing of commercial vehicles, both at permanent inspection stations on Interstate highways and with portable scales. The Tennessee Highway Patrol

3871-863: The advantages of being responsive, useful in a wide range of power levels, environmentally friendly, efficient, simple to install, and easy to maintain. Batteries also facilitate the use of electric motors, which have their own advantages. On the other hand, batteries have low energy densities, short service life, poor performance at extreme temperatures, long charging times, and difficulties with disposal (although they can usually be recycled). Like fuel, batteries store chemical energy and can cause burns and poisoning in event of an accident. Batteries also lose effectiveness with time. The issue of charge time can be resolved by swapping discharged batteries with charged ones; however, this incurs additional hardware costs and may be impractical for larger batteries. Moreover, there must be standard batteries for battery swapping to work at

3950-458: The air, causing harmful acid rain . While intermittent internal combustion engines were once the primary means of aircraft propulsion, they have been largely superseded by continuous internal combustion engines, such as gas turbines . Turbine engines are light and, particularly when used on aircraft, efficient. On the other hand, they cost more and require careful maintenance. They can also be damaged by ingesting foreign objects, and they produce

4029-417: The aircraft when retracted. Reverse thrust is also used in many aeroplane engines. Propeller aircraft achieve reverse thrust by reversing the pitch of the propellers, while jet aircraft do so by redirecting their engine exhausts forward. On aircraft carriers , arresting gears are used to stop an aircraft. Pilots may even apply full forward throttle on touchdown, in case the arresting gear does not catch and

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4108-454: The collars of both seasonal uniform shirts. The uniform pant is forest green with a wide black stripe. The uniform hat is a forest green campaign style hat. A felt version is worn with the winter uniform while a straw version is worn with the summer uniform. A miniaturized version of the breast badge is worn as a hat badge while higher ranks display their insignia of rank on the uniform hat. A silver or gold (Depending on Rank) cord with acorns

4187-494: The driveability of a car. The term "driver" originated in the 15th century, referring to the occupation of driving working animals such as pack or draft horses . It later applied to electric railway drivers in 1889 and motor-car drivers in 1896. The world's first long-distance road trip by automobile was in 1888, when Bertha Benz drove a Benz Patent-Motorwagen from Mannheim to Pforzheim , Germany. Driving requires both physical and mental skills, as well as an understanding of

4266-515: The driver is not continuously or annually evaluated. Car ownership does not require a driver's license at all. As such, even with a withdrawn driver's license , former drivers are still legally allowed to possess a car and thus have access to it. In the USA, between 1993 and 1997 13.8% of all drivers involved in fatal crashes had no driver's license. In some countries (such as the UK), the car itself needs have

4345-410: The environment. A related engine is the external combustion engine . An example of this is the steam engine. Aside from fuel, steam engines also need water, making them impractical for some purposes. Steam engines also need time to warm up, whereas IC engines can usually run right after being started, although this may not be recommended in cold conditions. Steam engines burning coal release sulfur into

4424-625: The first large-scale rocket program. The Opel RAK.1 became the first rocket car ; the following year, it also became the first rocket-powered aircraft . In 1961, the Soviet space program 's Vostok 1 carried Yuri Gagarin into space. In 1969, NASA 's Apollo 11 achieved the first Moon landing . In 2010, the number of motor vehicles in operation worldwide surpassed 1 billion, roughly one for every seven people. There are over 1 billion bicycles in use worldwide. In 2002 there were an estimated 590 million cars and 205 million motorcycles in service in

4503-650: The first sustained, controlled, reproducible flights. In 1903, the Wright brothers flew the Wright Flyer , the first controlled, powered aircraft, in Kitty Hawk, North Carolina . In 1907, Gyroplane No.I became the first tethered rotorcraft to fly. The same year, the Cornu helicopter became the first rotorcraft to achieve free flight. In 1928, Opel initiated the Opel-RAK program,

4582-537: The following skills: Distractions can compromise a driver's mental skills, as can any altered state of consciousness . One study on the subject of mobile phones and driving safety concluded that, after controlling for driving difficulty and time on task, drivers talking on a phone exhibited greater impairment than drivers who were suffering from alcohol intoxication. In the US "During daylight hours, approximately 481,000 drivers are using cell phones while driving according to

4661-418: The ground. A Boeing 757 brake, for example, has 3 stators and 4 rotors. The Space Shuttle also uses frictional brakes on its wheels. As well as frictional brakes, hybrid and electric cars, trolleybuses and electric bicycles can also use regenerative brakes to recycle some of the vehicle's potential energy. High-speed trains sometimes use frictionless Eddy-current brakes ; however, widespread application of

4740-614: The more ubiquitous land vehicles, which can be broadly classified by the type of contact interface with the ground : wheels , tracks , rails or skis , as well as the non-contact technologies such as maglev . ISO 3833-1977 is the international standard for road vehicle types, terms and definitions. It is estimated by historians that boats have been used since prehistory ; rock paintings depicting boats, dated from around 50,000 to 15,000 BC, were found in Australia . The oldest boats found by archaeological excavation are logboats , with

4819-483: The motion, such as a brake and steering system. By far, most vehicles use wheels which employ the principle of rolling to enable displacement with very little rolling friction . It is essential that a vehicle have a source of energy to drive it. Energy can be extracted from external sources, as in the cases of a sailboat , a solar-powered car , or an electric streetcar that uses overhead lines. Energy can also be stored, provided it can be converted on demand and

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4898-683: The oldest logboat found, the Pesse canoe found in a bog in the Netherlands, being carbon dated to 8040–7510 BC, making it 9,500–10,000 years old, A 7,000 year-old seagoing boat made from reeds and tar has been found in Kuwait. Boats were used between 4000 -3000 BC in Sumer , ancient Egypt and in the Indian Ocean. There is evidence of camel pulled wheeled vehicles about 4000–3000 BC. The earliest evidence of

4977-466: The propeller has been tested on many terrestrial vehicles, including the Schienenzeppelin train and numerous cars. In modern times, propellers are most prevalent on watercraft and aircraft, as well as some amphibious vehicles such as hovercraft and ground-effect vehicles . Intuitively, propellers cannot work in space as there is no working fluid; however, some sources have suggested that since space

5056-578: The publication on the National Highway Traffic Safety Association. Another survey indicated that music could adversely affect a driver's concentration." Seizure disorders and Alzheimer's disease are among the leading medical causes of mental impairment among drivers in the United States and Europe. Whether or not physicians should be allowed, or even required, to report such conditions to state authorities, remains highly controversial. Safety issues in driving include: There

5135-463: The rate of deceleration or where the brakes have failed, several mechanisms can be used to stop a vehicle. Cars and rolling stock usually have hand brakes that, while designed to secure an already parked vehicle, can provide limited braking should the primary brakes fail. A secondary procedure called forward-slip is sometimes used to slow airplanes by flying at an angle, causing more drag. Motor vehicle and trailer categories are defined according to

5214-500: The rules of the road. In many countries, drivers must pass practical and theoretical driving tests to obtain a driving license. Physical skills required for driving include proper hand placement, gear shifting, pedal operation, steering , braking , and operation of ancillary devices. Mental skills involve hazard awareness, decision-making, evasive maneuvering, and understanding vehicle dynamics . Distractions , altered states of consciousness , and certain medical conditions can impair

5293-565: The shape of a cone or bell , some unorthodox designs have been created such as the aerospike . Some nozzles are intangible, such as the electromagnetic field nozzle of a vectored ion thruster. Continuous track is sometimes used instead of wheels to power land vehicles. Continuous track has the advantages of a larger contact area, easy repairs on small damage, and high maneuverability. Examples of vehicles using continuous tracks are tanks, snowmobiles and excavators. Two continuous tracks used together allow for steering. The largest land vehicle in

5372-462: The storing medium's energy density and power density are sufficient to meet the vehicle's needs. Human power is a simple source of energy that requires nothing more than humans. Despite the fact that humans cannot exceed 500 W (0.67 hp) for meaningful amounts of time, the land speed record for human-powered vehicles (unpaced) is 133 km/h (83 mph), as of 2009 on a recumbent bicycle . The energy source used to power vehicles

5451-521: The suppression of narcotics on the state's roads and highways, including Interstate Highways . It is the agency responsible for conducting background checks on applicants for permits to carry handguns . The Tennessee Highway Patrol came into existence on December 14, 1929, to replace the unpopular Tennessee State Police Force, which had been created in 1926 and had been patterned after the Texas Rangers to obtain fees and taxes from citizens. In 1957,

5530-440: The technology has been limited by overheating and interference issues. Aside from landing gear brakes, most large aircraft have other ways of decelerating. In aircraft, air brakes are aerodynamic surfaces that provide braking force by increasing the frontal cross section, thus increasing the increasing the aerodynamic drag of the aircraft. These are usually implemented as flaps that oppose air flow when extended and are flush with

5609-509: The teenage years. Driveability of a vehicle means the smooth delivery of power, as demanded by the driver. Typical causes of driveability degradation are rough idling , misfiring , surging , hesitation , or insufficient power. Drivers are subject to the laws of the jurisdiction in which they are driving. Some jurisdictions submit to some or all of the requirements of the Geneva Convention on Road Traffic of 1949. Additionally,

5688-541: The use of a pulse jet was the V-1 flying bomb . Pulse jets are still occasionally used in amateur experiments. With the advent of modern technology, the pulse detonation engine has become practical and was successfully tested on a Rutan VariEze . While the pulse detonation engine is much more efficient than the pulse jet and even turbine engines, it still suffers from extreme noise and vibration levels. Ramjets also have few moving parts, but they only work at high speed, so their use

5767-422: The vehicle; it requires knowing how to apply the rules of the road (which ensure safe and efficient sharing with other users). An effective driver also has an intuitive understanding of the basics of vehicle handling and can drive responsibly. Although direct operation of a bicycle and a mounted animal are commonly referred to as riding , such operators are legally considered drivers and are required to obey

5846-464: The world, the Bagger 293 , is propelled by continuous tracks. Propellers (as well as screws, fans and rotors) are used to move through a fluid. Propellers have been used as toys since ancient times; however, it was Leonardo da Vinci who devised what was one of the earliest propeller driven vehicles, the "aerial-screw". In 1661, Toogood & Hays adopted the screw for use as a ship propeller. Since then,

5925-642: The world. At least 500 million Chinese Flying Pigeon bicycles have been made, more than any other single model of vehicle. The most-produced model of motor vehicle is the Honda Super Cub motorcycle, having sold 60 million units in 2008. The most-produced car model is the Toyota Corolla , with at least 35 million made by 2010. The most common fixed-wing airplane is the Cessna 172 , with about 44,000 having been made as of 2017. The Soviet Mil Mi-8 , at 17,000,

6004-630: Was a Soviet-designed screw-propelled vehicle designed to retrieve cosmonauts from the Siberian wilderness. All or almost all of the useful energy produced by the engine is usually dissipated as friction; so minimizing frictional losses is very important in many vehicles. The main sources of friction are rolling friction and fluid drag (air drag or water drag). Wheels have low bearing friction, and pneumatic tires give low rolling friction. Steel wheels on steel tracks are lower still. Aerodynamic drag can be reduced by streamlined design features. Friction

6083-708: Was in August 1888, when Bertha Benz , wife of Benz Patent-Motorwagen inventor Karl Benz , drove 66 mi (106 km) from Mannheim to Pforzheim , Germany , and returned, in the third experimental Benz motor car, which had a maximum speed of 10 mph (16 km/h), with her two teenage sons Richard and Eugen but without the consent and knowledge of her husband. She had said she wanted to visit her mother, but also intended to generate publicity for her husband's invention, which had only been taken on short test drives before. In 1899, F. O. Stanley and his wife Flora drove their Stanley Steamer automobile, sometimes called

6162-644: Was of little practical use. In 1817, The Laufmaschine ("running machine"), invented by the German Baron Karl von Drais , became the first human means of transport to make use of the two-wheeler principle . It is regarded as the forerunner of the modern bicycle (and motorcycle). In 1885, Karl Benz built (and subsequently patented) the Benz Patent-Motorwagen , the first automobile, powered by his own four-stroke cycle gasoline engine . In 1885, Otto Lilienthal began experimental gliding and achieved

6241-417: Was the 16th state admitted in the Union; therefore the shoulder patch has a Roman numeral 16 displayed on it. The uniform of the THP consists of a tan uniform shirt with forest green epaulets and pocket flaps. Long sleeves with a forest green tie is worn during the winter months while short sleeves with an open collar is worn during the summer months. Collar ornaments that have the letters "T.H.P" are worn on

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