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Opel Vectra
The Opel Vectra, sold as the Vauxhall, Holden, and Chevrolet Vectra, is a mid-size family car built by Opel from 1988 to 2008 through three generations.
Opel Zafira
The Opel Zafira, sold in the UK as the Vauxhall Zafira, is a compact MPV built by German manufacturer Opel and first shown in 1999 as the first seven-seat compact van.
Open container law
An open container law is a statute banning open alcoholic beverage containers and drinking in the passenger area of a motor vehicle, whether by the driver or passengers.
Open-graded friction course
An open-graded friction course (OGFC) is a thin, porous asphalt surface layer that lets water drain through it, improving wet-weather friction, reducing hydroplaning risk, and cutting tire noise.
Open-wheel car
An open-wheel car, also known as a single-seater or monoposto, is a racing car whose wheels sit outside the bodywork, defining Formula 1 and IndyCar.
Openpilot
Openpilot is an open-source driver assistance system developed by comma.ai, released in 2016, that performs adaptive cruise control and lane centering on 335 supported production cars.
Operational design domain
An operational design domain (ODD) is the set of operating conditions, such as road type, speed, and weather, under which a driving automation system is designed to function.
Optimal velocity model
The optimal velocity model is a car-following model of traffic, proposed in 1995, in which each driver adjusts speed to a target velocity set by the distance to the vehicle ahead.
Orange County Choppers
Orange County Choppers is an American custom motorcycle manufacturer founded in 1999 by Paul Teutul Sr. in New York, best known as the subject of the reality series American Chopper.
Oregon Department of Transportation
The Oregon Department of Transportation (ODOT) is the state agency responsible for highways, driver licensing, transit, and rail, founded in 1913 and headquartered in Salem.
Oshkosh M1070
The Oshkosh M1070 is an 8x8 military truck tractor built by Oshkosh Defense since 1992 to haul the M1 Abrams tank for the U.S. Army.
Otokar Cobra II
The Otokar Cobra II is a 4x4 tactical wheeled armored vehicle built by Turkish manufacturer Otokar and introduced in 2013, configurable for transport, reconnaissance, command, and ambulance roles.
Otta seal
An Otta seal is a thin bituminous surface treatment for low-volume roads, developed by Norwegian road authorities in 1963, that uses soft binder and inexpensive graded aggregate.
Outer Ring Road, Hyderabad
The Nehru Outer Ring Road, or ORR, is a 158 km, eight-lane access-controlled expressway encircling Hyderabad, India, built from 2007 and fully opened in June 2016.
Outlaw motorcycle club
An outlaw motorcycle club, or biker gang, is a motorcycle club outside mainstream motorcycling sanction that emerged in the United States after World War II.
Outlaws Motorcycle Club
The Outlaws Motorcycle Club, also known as Outlaws MC, is an American outlaw motorcycle club founded in 1935 in McCook, Illinois, one of the oldest in the United States.
Overdrive (mechanics)
Overdrive (mechanics) is a transmission gear ratio below 1:1, so the output spins faster than the engine crankshaft, cutting RPM, noise, and fuel use on highways.
Overseas Highway
The Overseas Highway, also known as the Florida Keys Scenic Highway, is the 126-mile segment of U.S. 1 from Florida City to Key West and the Keys' only road link to the mainland.
Oxbotica
Oxbotica was a British autonomous vehicle software company founded in Oxford in 2014 as a University of Oxford spin-out, rebranded as Oxa in 2023 to focus on industrial self-driving software.
Oxford Street
Oxford Street, historically the Tyburn Road, is a major retail street in London's West End, running 1.2 miles from Marble Arch to Tottenham Court Road and home to Selfridges, John Lewis, and Marks & Spencer.
Paccar
Paccar, formerly Pacific Car and Foundry, is an American truck manufacturer headquartered in Bellevue, Washington, selling Kenworth, Peterbilt, and DAF trucks, diesel engines, parts, and financial services.
Pacific Coast Highway
The Pacific Coast Highway is the popular name for California State Route 1, a 656-mile coastal highway from Dana Point to Mendocino County, completed in 1937.
Pacific Highway (Australia)
The Pacific Highway is a 960-kilometer road along the New South Wales coast, running from North Sydney to the Queensland border and linking Sydney with Brisbane.
Packard
Packard, an American luxury automobile manufacturer, was founded in Warren, Ohio, in 1899 and produced over 1.6 million vehicles before discontinuing the marque in 1958.
Pagan's Motorcycle Club
Pagan's Motorcycle Club, also known as Pagans MC, is an American outlaw motorcycle club founded in Maryland in the late 1950s and concentrated on the East Coast.
Pagani Automobili
Pagani Automobili is an Italian manufacturer of hand-built hypercars, founded by Horacio Pagani in 1998 in San Cesario sul Panaro near Modena, Italy, and known for the Zonda, Huayra, and Utopia model lines.
Pagani Huayra
The Pagani Huayra is an Italian mid-engine two-seat hypercar built by Pagani Automobili, unveiled at the 2011 Geneva Motor Show and named after the Andean god of wind.
Pagani Zonda
The Pagani Zonda is a mid-engine, V12-powered sports car made by Italian manufacturer Pagani Automobili, unveiled at the 1999 Geneva Motor Show; 140 street-legal examples were built by 2024.
Painted median
A painted median, also called a flush median, is a traversable median defined by pavement markings rather than a raised surface, most often used for left-turn channelization.
Palisades Interstate Parkway
The Palisades Interstate Parkway is a 42-mile scenic limited-access parkway running from the George Washington Bridge in New Jersey north along the Palisades cliffs to Bear Mountain, New York.