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Ackermann steering geometry
Ackermann steering geometry is an arrangement of steering linkages that steers the inside front wheel at a larger angle than the outside wheel so all wheels roll without scrubbing.
Active traffic management
Active traffic management (ATM) is the real-time electronic control of motorway capacity and safety, using variable speed limits, hard shoulder running, ramp metering, and queue warning.
Acura (アキュラ)
Acura (アキュラ) is the luxury and performance automobile marque of Japanese automaker Honda, launched in the United States in 1986 as the first Japanese luxury brand.
Acura ADX
The Acura ADX is a subcompact luxury crossover SUV introduced by Acura for 2025, slotting below the RDX and MDX as the brand's entry SUV.
Acura CL
The Acura CL is a front-wheel-drive luxury coupe sold by Honda's Acura division in the United States in two generations, 1997 through 1999 and 2001 through 2003.
Acura ILX
The Acura ILX was a compact luxury sedan sold by Honda's Acura division from the 2013 through 2022 model years, built on the Honda Civic platform as Acura's entry model.
Acura Legend
The Acura Legend is a luxury sedan introduced March 27, 1986 as the first model from Acura, Honda's North American luxury marque, later continuing as the Acura RL.
Acura MDX
The Acura MDX is a three-row mid-size luxury crossover SUV built by Honda's Acura division since 2001, serving as Acura's flagship with a Type S variant since 2022.
Acura RDX
The Acura RDX is a compact luxury crossover SUV built by Honda's Acura division since 2006, selling around 850,000 units in North America across three generations.
Acura RL
The Acura RL, also known as the 3.5RL, is a full-size luxury sedan sold in North America from 1996 to 2012 as Acura's flagship, succeeding the Legend.
Acura TL
The Acura TL, also known as the 3.2TL, is a mid-size luxury sport sedan sold by Acura from 1996 through 2014, later replaced by the TLX.
Acura TLX
The Acura TLX is a mid-size luxury sport sedan from Honda's Acura division, built from 2015 to 2025 as the successor to the TL and TSX.
Acura TSX
The Acura TSX was an entry-luxury sport sedan sold by Honda's Acura division in North America from 2004 to 2014, based on the European Honda Accord.
Adaptive cruise control
Adaptive cruise control, also called autonomous cruise control, is a driver assistance system that automatically adjusts vehicle speed to keep a set distance from the car ahead.
Adirondack Trailways
Adirondack Trailways is the operating brand of Adirondack Transit Lines, Inc., an intercity bus company founded in 1926 and headquartered in Hurley, New York, serving eastern New York State and Montreal.
Adler (cars and motorcycle)
Adler, also known as Adlerwerke, was a Frankfurt vehicle manufacturer founded in 1880 that built cars from around 1900 to 1939 and motorcycles until 1958 before becoming Triumph-Adler.
Administrative license suspension
Administrative license suspension, also called administrative license revocation, is a civil action suspending a driver's license immediately after a drunk-driving arrest, before criminal proceedings conclude.
Advanced driver-assistance systems
Advanced driver-assistance systems (ADAS) are vehicle technologies that monitor the road and driver inputs, warning of crashes or intervening with automatic braking and steering to prevent or lessen collisions.
Advanced Reconnaissance Vehicle
The Advanced Reconnaissance Vehicle (ARV) is a planned US Marine Corps combat vehicle family intended to replace the Light Armored Vehicle, with six variants and prototypes from Textron and General Dynamics.
Advanced traffic management system
An advanced traffic management system (ATMS) is an intelligent transportation system using sensors, software, and a traffic management center to monitor roads and control traffic in real time.
AEC Routemaster
The AEC Routemaster is a double-decker bus developed by London Transport with AEC and Park Royal Vehicles, built from 1958 to 1968 and withdrawn from London service in 2005.
Afeela 1
The Afeela 1 was an electric sedan from Sony Honda Mobility, the Sony-Honda joint venture, revealed at CES 2025 and canceled in March 2026 before deliveries began.
Agence nationale des titres sécurisés
The Agence nationale des titres sécurisés, known as France Titres since 2024, is the French agency producing identity cards, passports, driving licenses, and vehicle registration certificates.
AGV (helmet manufacturer)
AGV is an Italian motorcycle helmet manufacturer founded in 1947 by Gino Amisano, whose helmets have been worn by champions from Agostini to Valentino Rossi.
Aimsun
Aimsun (Aimsun SLU) is a Barcelona-based transport technology company whose main product, Aimsun Next, simulates road networks at microscopic, mesoscopic, macroscopic, and hybrid levels; it also offers Aimsun Live, a real-time digital twin.
Aion i60
The Aion i60 is a compact five-seat electric SUV from China's GAC Aion, launched in November 2025 as the brand's first model offered in both battery electric and extended-range versions.
Aion UT (埃安UT)
The Aion UT (埃安UT) is a compact electric hatchback from GAC Group's Aion brand, launched in China in 2025 and also sold in Europe and Southeast Asia.
Air brake (road vehicle)
An air brake is a road vehicle braking system that uses compressed air from an engine-driven compressor, standard on heavy trucks, buses, and trailers rather than the hydraulic brakes used on cars.
Air spring
An air spring is a suspension spring that uses compressed air instead of a metal coil, adjustable by pump and lighter than a coil spring.
Air suspension
Air suspension, also called pneumatic suspension, is a vehicle suspension system using pressurized rubber bellows instead of metal springs, allowing adjustable ride height and self-leveling under varying loads.