Types of buses Overview of bus categories, their design features, history, typical uses and current trends including accessibility and electrification.
U.S. Route 101 in California U.S. Route 101 is a principal north–south highway on California's coast, an original 1926 U.S. Route and the state's longest highway, linking coastal cities and major landmarks fro…
U.S. Route 160 An east–west U.S. Highway linking northern Arizona and the Navajo Nation with the Four Corners, southern Colorado, the plains of Kansas and the Ozark region of Missouri.
U.S. Route 166 U.S. Route 166 is an east–west U.S. Highway across southern Kansas, serving small towns, agriculture and tourism and surviving as a branch of the historic U.S. Route 66.
U.S. Route 2 — Northern United States highway U.S. Route 2 U.S. Route 2 is a major east–west United States highway in the far northern tier, composed of two segments that run near the Canadian border and serve both transportation and sceni…
U.S. Route 24 (US 24) U.S. Route 24 U.S. Route 24 is an east–west United States highway that stretches from Minturn, Colorado to Independence Township, Michigan, passing through seven states and several major Midwest…
U.S. Route 25: an overview of the north–south highway in the eastern United States U.S. Route 25 U.S. Route 25 is a historic north–south United States highway running from Cincinnati, Ohio, to Brunswick, Georgia, passing through several southeastern states and serving local, c…
U.S. Route 250 — Sandusky, Ohio to Richmond, Virginia U.S. Route 250 U.S. Route 250 is a 514-mile U.S. Highway spur of US 50 connecting Sandusky, Ohio, with Richmond, Virginia, crossing Ohio, West Virginia and Virginia and serving cities such as Whe…
U.S. Route 3: New England highway from Cambridge, MA to the Canadian border U.S. Route 3 U.S. Route 3 is a U.S. Highway running north–south from Cambridge, Massachusetts to the Canadian border, serving suburban, rural and recreational corridors across Massachusetts and…
U.S. Route 36 U.S. Route 36 is an east–west United States highway running about 1,414 miles from Rocky Mountain National Park, Colorado, to Uhrichsville, Ohio, linking mountain gateways, plains…
U.S. Route 4 — East Greenbush, NY to Portsmouth, NH U.S. Route 4 U.S. Route 4 is an east–west U.S. Highway linking the Albany area of New York with the seacoast of New Hampshire, running roughly 250 miles through New York, Vermont, and New Hamps…
U.S. Route 40 — Historic east–west highway from Park City, Utah to Atlantic City U.S. Route 40 U.S. Route 40 is an east–west U.S. Highway running today from Park City, Utah to Atlantic City, New Jersey. Established in 1926, it follows historic corridors such as the National…
U.S. Route 400 U.S. Route 400 is an east–west U.S. Highway established in 1994 that runs mostly across Kansas from Granada, Colorado, to an interchange near Joplin, Missouri.
U.S. Route 50 U.S. Route 50 is a transcontinental east–west U.S. Highway running from West Sacramento, California, to Ocean City, Maryland, notable for varied landscapes, long rural stretches an…
U.S. Route 54 U.S. Route 54 is a 1,197-mile U.S. Highway running between El Paso, Texas and Griggsville, Illinois, linking the American Southwest and Midwest and paralleling parts of the Union P…
U.S. Route 56 U.S. Route 56 is an east–west United States highway of about 640 miles linking Springer, New Mexico, with Kansas City, Missouri, and following portions of the historic Santa Fe Tra…
U.S. Route 59 U.S. Route 59 is a long north–south U.S. highway from Laredo, Texas, to the Canada border in Minnesota, linking multiple states and serving as an important regional freight corrido…
U.S. Route 66: The Mother Road — history, route, and cultural legacy U.S. Route 66 U.S. Route 66, the historic transcontinental highway from Chicago to Los Angeles, shaped American travel and culture. Overview, route, history, significance, and preservation.
U.S. Route 69: North–South highway from Port Arthur, Texas to Albert Lea, Minnesota U.S. Route 69 U.S. Route 69 is a major north–south U.S. Highway linking Port Arthur, Texas, with Albert Lea, Minnesota, traversing multiple states and serving urban centers, rural communities, f…
U.S. Route 73 U.S. Route 73 is a north–south highway linking Bonner Springs, Kansas, with rural areas near Dawson, Nebraska, serving regional towns and connecting to major interstates across app…
U.S. Route 75 — major north–south highway through the central United States U.S. Route 75 U.S. Route 75 is a principal north–south United States highway running roughly 1,239 miles from Dallas, Texas, to the Canada–US border in Minnesota, serving urban freeways and rura…
U.S. Route 78 U.S. Route 78 is an east–west U.S. highway linking Memphis, Tennessee, to Charleston, South Carolina, crossing several states and serving both long-distance and local traffic along…
U.S. Route 81: history, route, and significance U.S. Route 81 U.S. Route 81 is a historic north–south highway in the central United States, originally part of the 1926 U.S. Numbered Highways and following older corridors such as the Meridian…
U.S. Route 9 U.S. Route 9 is a north–south United States highway running from Laurel, Delaware, through New Jersey and New York, to Champlain near the U.S.–Canada border. It serves urban, subur…
UIC classification of locomotive axle arrangements International system used to describe wheel/axle layouts of locomotives, multiple units and trams, using letters, numbers and qualifiers to indicate powered axles, bogies and artic…
UK railway stations beginning with A UK railway stations – A Overview of United Kingdom railway stations whose names start with the letter A, including naming patterns, examples, types, history and distinguishing features.
UK railway stations — B UK railway stations – B Encyclopedic overview of United Kingdom railway stations beginning with the letter B: types, history, notable examples, facilities, accessibility and practical guidance for travell…
UK railway stations beginning with C UK railway stations – C Overview of United Kingdom railway stations starting with the letter C, covering naming patterns, historical development, roles within the network, notable examples and conservatio…
UK railway stations beginning with D UK railway stations – D Overview of United Kingdom railway stations whose names start with the letter D, highlighting common features, notable examples, historical development and contemporary roles.
UK railway stations beginning with Y UK railway stations – Y An overview of United Kingdom railway stations whose names start with the letter Y, covering their types, distribution, notable examples, history and role in local travel.
Ultimate Air Shuttle Ultimate Air Shuttle is a U.S.-based regional shuttle airline operating frequent short-haul flights from a Cincinnati hub; founded with its first flight in July 2009.
Undercarriage (Aircraft Landing Gear) Undercarriage The undercarriage, or landing gear, is the structure supporting an aircraft on the ground. This article explains types, components, history, operations and notable distinctions.
Unicycle: single-wheel cycle — design, history, and uses Unicycle A unicycle is a single-wheel pedal vehicle used for performance, sport and transport. This article explains its design, common types, riding techniques, historical origins and prac…
Union Pacific Railroad: Overview, History, and Role in U.S. Freight Transportation Union Pacific Railroad Union Pacific Railroad is the largest freight railroad in the United States, operating thousands of locomotives across a network that spans much of the western two-thirds of the co…
United Airlines Flight 232: 1989 DC-10 Crash and Its Lasting Impact United Airlines Flight 232 On July 19, 1989, United Airlines Flight 232 suffered an uncontained engine failure and loss of flight controls, crash-landing in Sioux City. Of 296 aboard, 111 died and 185 surviv…
United States Army Trucks: History, Types, and Roles United States Army trucks An overview of U.S. Army trucks from early off‑road trials to modern tactical families, describing their development, common features, vehicle types and roles in military logistics…
United States Numbered Highways: history, structure, and significance United States Numbered Highways Overview of the United States Numbered Highway system: its numbering, history, road types, relationship with the Interstate System, notable routes and cultural importance.
Unmanned Aerial Vehicle (UAV): Definition, Types, Uses and Issues Unmanned aerial vehicle A comprehensive overview of unmanned aerial vehicles (drones): what they are, how they work, their history, common uses, types, regulations, safety concerns and future directions.
Upper Thomson MRT station (TE8) — Overview and significance Upper Thomson MRT station Upper Thomson MRT (TE8) is an underground station on the Thomson–East Coast line in Bishan, Singapore, serving the Upper Thomson area and nearby amenities such as Thomson Plaza.
Urawa Station (Saitama, Japan) Urawa Station Major JR East railway station in Urawa, Saitama. A commuter hub on the Keihin–Tōhoku and Tōhoku Main routes with bus and local connections and a long role in the city's development…
USA3000 Airlines USA3000 Airlines was a U.S. leisure carrier founded by Apple Vacations in 2001, operating Airbus A320 family jets on charter and scheduled routes to Caribbean and Mexican destinati…
USS Abraham Lincoln (CVN-72) — Nimitz-class aircraft carrier USS Abraham Lincoln (CVN-72) Nuclear-powered Nimitz-class aircraft carrier of the United States Navy named for President Abraham Lincoln; serves as a sea-based airfield for power projection, maritime security…
USS Enterprise (CV-6): The Big E — Yorktown‑class U.S. carrier of World War II USS Enterprise (CV-6) USS Enterprise (CV-6), nicknamed "The Big E" and "The Grey Ghost," was a Yorktown-class aircraft carrier that earned 20 battle stars and served extensively in the Pacific during Wo…
USS Ronald Reagan (CVN-76) USS Ronald Reagan USS Ronald Reagan (CVN-76) is a Nimitz-class, nuclear-powered aircraft carrier of the United States Navy, named for President Ronald Reagan and notable for its power-projection rol…
Utility cycling: everyday transport by bicycle Utility cycling Utility cycling refers to riding a bicycle primarily for transportation—commuting, shopping, errands and social trips—covering short to medium distances in cities and towns, often…
Vale of Rheidol Railway A preserved narrow‑gauge steam railway running from Aberystwyth to Devil's Bridge through the Rheidol Valley in Ceredigion, Wales, notable for its scenic route and continuous opera…
Van (vehicle): types, design, uses, history and regulations Van Overview of vans: types (panel, cargo, passenger, minivan), design features, history, common uses, manufacturers, licensing and market trends including notable models.
Vancouver International Airport (YVR) — overview, facilities, and significance Vancouver International Airport Major international airport on Sea Island serving Vancouver and British Columbia; known for multiple terminals, runway capacity, US preclearance and a rapid transit connection to d…
