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U.S. Xpress
U.S. Xpress is a Chattanooga, Tennessee-based truckload carrier founded in 1985 with about 7,200 tractors; Knight-Swift acquired it on July 1, 2023 for a total purchase price of $630.0 million.
UAZ (УАЗ)
UAZ, from the Russian for Ulyanovsk Automobile Plant, is a Russian automaker in Ulyanovsk known since 1941 for the UAZ-469, Bukhanka van, and Patriot SUV.
UAZ-452
The UAZ-452, popularly known as the Bukhanka (Буханка) for its loaf shape, is a Soviet and Russian four-wheel-drive van built by UAZ since 1965 and still in production.
UAZ-469
The UAZ-469 is a Soviet four-wheel-drive light utility vehicle produced by the Ulyanovsk Automobile Plant from 1972, replacing the GAZ-69 and serving military and civilian roles in over 80 countries.
Uber
Uber, also known as Uber Technologies, is an American platform for ride-hailing and food delivery through a smartphone app, serving over 40 million daily trips in 70+ countries.
Uber Eats
Uber Eats, first launched as UberFRESH in 2014, is an online food ordering and delivery platform by Uber Technologies connecting restaurants, couriers, and customers in over 11,000 cities worldwide.
Uber Freight
Uber Freight is a digital freight brokerage and logistics platform operated by Uber Technologies that matches shippers with truck carriers, launched as an app in May 2017.
UD Trucks (トラックス株式会社)
UD Trucks, formerly Nissan Diesel Motor, is a Japanese commercial vehicle manufacturer founded in 1935, headquartered in Ageo, Saitama, and owned by the Isuzu Group since 2021.
UL 4600
UL 4600 is an ANSI safety standard, published by UL Standards & Engagement in April 2020, for building safety cases for autonomous vehicles that operate without human supervision.
Ultima RS
The Ultima RS is a British sports car from Ultima Sports Ltd of Leicester, produced since 2021 with a Corvette-derived V8 and a 250 mph top speed.
UN number
A UN number is a four-digit code prefixed with UN that identifies dangerous goods in transport, appearing on shipping papers and placards for first responders.
Underbone
An underbone, also called a cub motorcycle, is a small motorcycle common in Southeast Asia that uses foot pegs rather than a floorboard, with the engine mounted beneath the rider.
Underride guard
An underride guard is a steel barrier on the rear or side of a large truck that stops vehicles from sliding underneath in a crash.
Understeer and oversteer
Understeer and oversteer are the two ways a car's cornering deviates from its steering: turning less sharply and running wide, or more sharply with the rear sliding out.
UNECE Regulation No. 155
UNECE Regulation No. 155 is a United Nations vehicle regulation on cybersecurity, adopted in 2020, requiring manufacturers to run a certified Cyber Security Management System for type approval.
UNECE Regulation No. 156
UNECE Regulation No. 156, also known as UN Regulation No. 156, is a United Nations vehicle regulation on software updates, adopted in June 2020 and in force since January 2021.
UNECE Regulation No. 157
UNECE Regulation No. 157, also called UN R157, is a United Nations regulation for the type approval of vehicles with Automated Lane Keeping Systems, adopted in June 2020 and in force since January 2021.
UNECE Regulation No. 171
UNECE Regulation No. 171, also called UN Regulation No. 171, is a UN vehicle regulation for Driver Control Assistance Systems (DCAS), adopted in Geneva in March 2024 and applied by 60 contracting parties.
UNECE Vehicle Regulations
UNECE Vehicle Regulations are United Nations technical regulations for wheeled vehicles, developed by WP.29 in Geneva and applied through type approval with mutual recognition among contracting parties.
UNECE World Forum for Harmonization of Vehicle Regulations
The UNECE World Forum for Harmonization of Vehicle Regulations (WP.29) is a United Nations forum where governments agree common technical regulations for wheeled vehicles, created in 1952.
Unicycle
A unicycle is a human-powered vehicle with a single wheel and pedals cranked directly on the axle; unlike a bicycle it has no gears or handlebars, the saddle steering it.
Uniform Vehicle Code
The Uniform Vehicle Code (UVC) is a model set of US traffic laws published by the National Committee on Uniform Traffic Laws and Ordinances, first produced in 1926.
Unimog
The Unimog is a Mercedes-Benz range of all-wheel-drive utility vehicles with portal axles and implement attachments, first series-produced in 1949, with more than 375,000 built for farming, municipal, firefighting, and road-rail work.
Uniroyal
Uniroyal is an American tire brand that originated as the United States Rubber Company, incorporated in 1892 and renamed Uniroyal in 1967; its tires are now owned by Michelin.
United Nations Economic Commission for Europe Inland Transport Committee
The Inland Transport Committee (ITC) is the highest transport policy body of the United Nations Economic Commission for Europe, created in 1947 to negotiate international transport agreements.
United States license plate designs and serial formats
License plate designs and serial formats in the United States vary by state. New York first registered automobiles in 1901, and standard plate size was fixed at 12 by 6 inches in 1956.
United States MRAP program
The United States MRAP program was a Department of Defense effort begun in February 2007 to rapidly buy V-hulled armored vehicles protecting troops from IEDs in Iraq and Afghanistan.
United States Numbered Highway System
The United States Numbered Highway System, also called U.S. Highways, is a national road network adopted in 1926, numbered with even routes east-west and odd routes north-south.
Universal motorcycle helmet law
A universal motorcycle helmet law requires all motorcycle riders and passengers to wear helmets regardless of age; by 2021, 18 states and DC had such laws.
Ural-4320
The Ural-4320 is a Soviet and Russian 6×6 all-terrain diesel cargo truck built by the Ural Automobile Plant in Miass since 1977, successor to the Ural-375D.