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Harley-Davidson Knucklehead engine
Harley-Davidson built the Knucklehead engine from 1936 to 1947; this 45-degree OHV V-twin was the company's first production engine and established the architecture for later big twins.
Harley-Davidson Sportster
The Harley-Davidson Sportster is a line of Harley-Davidson motorcycles produced since 1957, spanning air-cooled Ironhead and Evolution V-Twins until 2022 and the liquid-cooled Sportster S.
Harley-Davidson Super Glide
The Harley-Davidson Super Glide is a cruiser motorcycle introduced in 1971 as the FX Super Glide, credited as the industry's first factory custom, designed by Willie G. Davidson.
Harley-Davidson Touring
Harley-Davidson Touring, marketed as Grand American Touring, is a family of large long-distance motorcycles with hard saddlebags, fairings, and large-displacement V-twin engines, tracing to the 1965 Electra Glide.
Harley-Davidson Twin Cam engine
The Harley-Davidson Twin Cam is a 45-degree air-cooled pushrod V-twin that powered Big Twin motorcycles from 1999 to 2017, named for its two chain-driven camshafts, one per cylinder.
Harley-Davidson VRSC
The Harley-Davidson VRSC, marketed as the V-Rod, is a performance cruiser produced from 2002 to 2017, the first Harley-Davidson with overhead camshafts and liquid cooling.
Harmony Intelligent Mobility Alliance (鸿蒙智行)
Harmony Intelligent Mobility Alliance (鸿蒙智行, HIMA) is a Huawei-led automotive alliance in China, upgraded from the Huawei Zhixuan model in November 2023 and spanning five vehicle brands.
Hatchback
A hatchback is a passenger car whose rear door, incorporating the rear window, swings upward to open the cargo area to the cabin, unlike a sedan's trunk, in a two-box body design.
Haul truck
Haul truck (mining truck, rigid hauler): off-highway rigid-frame rear-dump truck for open-pit mining, from ~45 t to the 450 t BelAZ 75710; diesel-electric or mechanical drive, ultra-class models from Caterpillar, Komatsu, Liebherr, BelAZ.
Haval Xiaolong MAX
The Haval Xiaolong MAX (哈弗枭龙MAX) is a mid-size plug-in hybrid SUV from Great Wall Motor's Haval brand, launched in China in May 2023 and redesigned in 2025.
Hawaii Department of Transportation
The Hawaii Department of Transportation (HDOT) is the Hawaii state agency that plans and operates the state's highways, airports, and harbors, created by an act of 1959 after statehood.
Hazard perception test
The hazard perception test is a computer-based assessment used in driver licensing in the United Kingdom and Australia that measures how quickly a candidate responds to dangerous traffic scenes.
HCS (traffic software)
HCS (Highway Capacity Software) is a traffic analysis program implementing the Highway Capacity Manual, developed by the McTrans Center at the University of Florida since 1987.
Head restraint
A head restraint is a pad on a vehicle seat or the top of the seat back that limits rearward head movement and reduces whiplash injury in rear collisions.
Headlamp
A headlamp is a lamp mounted on the front of a motor vehicle to light the road at night, with lower beams for close range and upper beams for distance.
Hearse
A hearse, also called a funeral coach, is a vehicle built to carry a coffin at a funeral, typically leading the procession from service to burial.
Heavy Equipment Transport System
The Heavy Equipment Transport System, also known as the HET (Heavy Equipment Transporter), is the U.S. Army's M1070 tractor and M1000 semitrailer for moving main battle tanks.
Heavy Expanded Mobility Tactical Truck
The Heavy Expanded Mobility Tactical Truck (HEMTT) is a family of 8-wheel drive tactical trucks built by Oshkosh Defense for the United States Army since 1982.
Heavy-duty pickup
A heavy-duty pickup is a full-size pickup truck in US Classes 2b and 3, built to tow and haul beyond light-duty trucks, led by Ford Super Duty, GM HD, and Ram HD models.
Hells Angels
The Hells Angels Motorcycle Club, also known as HAMC, is an outlaw motorcycle club founded in California around 1950 and one of the largest in the world.
Hennessey Blackbird
The Hennessey Blackbird is a limited-production touring hypercar revealed in 2026 by Hennessey of Sealy, Texas, powered by a naturally aspirated 6.2-liter V8 and a six-speed manual.
Hennessey Performance Engineering
Hennessey Performance, also known as Hennessey Performance Engineering, is an American company founded by John Hennessey in 1991 that builds high-performance cars in Sealy, Texas.
Hennessey Venom F5
The Hennessey Venom F5 is an American hypercar built by Hennessey Special Vehicles in Sealy, Texas, with a 1,817-horsepower twin-turbo V8 and a target top speed above 300 mph.
Hennessey Venom GT
The Hennessey Venom GT is an American mid-engine hypercar built in Sealy, Texas, from 2010 to 2017, with only 13 made, using a Lotus Elise chassis.
Henrik Fisker
Henrik Fisker is a Danish automobile designer and entrepreneur who designed the BMW Z8 and Aston Martin V8 Vantage and founded Fisker Automotive and Fisker Inc.
Henry Ford II
Henry Ford II, known as Hank the Deuce, was an American businessman who led Ford Motor Company from 1945, rescuing it from near-collapse after World War II.
Henry Hudson Parkway
The Henry Hudson Parkway is a limited-access urban parkway in New York City, running 11.2 miles along the Hudson River from West 72nd Street to Westchester County.
Hero Honda CD 100
The Hero Honda CD 100 was a 100 cc commuter motorcycle produced in India from 1985 to 2004, establishing itself as the template for Indian commuter bikes.
Hero MotoCorp
Hero MotoCorp, formerly Hero Honda Motors, is an Indian motorcycle and scooter manufacturer based in New Delhi and the world's largest by volume. It began in 1984 as a joint venture with Honda.
High-definition map
A high-definition map is a centimeter-accurate digital representation of the road environment, recording lane geometry, markings, and traffic signals, serving as prior knowledge for automated vehicle localization, perception, and path planning.