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- U.S. Route 50 in ColoradoU.S. Route 50 (US 50) is a part of the U.S. Highway System that travels from West Sacramen
- U.S. Route 66Former US Highway between Chicago and Santa Monica
- U.S. Route 99 in CaliforniaU.S. Route 99 (US 99) was the main north–south United States Numbered Highway on the West
- U4 (Vienna U-Bahn)Line U4 is a line on the Vienna U-Bahn metro system. Opened in 1976, it currently has 20 s
- Udine (Milan Metro)Udine is a station on Line 2 of the Milan Metro. It is located at Piazzale Udine, near Par
- Uhlandstraße (Berlin U-Bahn)Uhlandstraße is the western terminus station of line U1 of the Berlin U-Bahn. It is locate
- Újbuda-központ metro stationÚjbuda-központ (lit. "Újbuda-Centrum") is a station on Line 4 of the Budapest Metro. The s
- Újpest-központ metro stationÚjpest-központ (lit. Újpest-Centrum) is the northern terminus of the Budapest Metro Line 3
- Újpest-városkapu metro stationÚjpest-városkapu (lit. Újpest-City Gate) is a station on the Budapest Metro Line 3 (North-
- Ullsteinstraße (Berlin U-Bahn)Ullsteinstraße is a Berlin U-Bahn station located on the U6 line. The station was designed
- Ultralight aircraft (Canada)The Canadian Aviation Regulations define two types of ultralight aircraft: basic ultra-lig
- Ultralight aviationAviation field involving lightweight aircraft
- Undercarriage arrangementsBelow are featured the wheeled undercarriage (also called landing gear) arrangements of so
- UnicycleOne-wheeled mode of transportation
- Union Pacific RailroadClass I freight railroad in the United States
- Unit loadThe term unit load refers to the size of an assemblage into which a number of individual i
- United States and the United Nations Convention on the Law of the SeaAmerican involvement in drafting but non-ratification
- United States Department of TransportationFederal executive department
- United States Maritime AdministrationAgency within the U.S. Department of Transportation
- United States Merchant MarineU.S. civilian mariners
- United States Merchant Marine AcademyU.S. service academy
- Universidad de Chile metro stationUniversidad de Chile (in Spanish: University of Chile) station is a transfer station betwe
- Unmanned aerial vehicleAircraft without any human pilot on board
- UpgradeProcess of improving something by replacing part of it or adding additional parts
- Urban rail transitTrain service intended for city-dwellers
- Uruguai StationUruguai / Tijuca is a station on the Rio de Janeiro Metro that services the neighborhood o
- USS Advance (1862)USS Advance, the second United States Navy ship to be so named, was later known as USS Fro
- Utah Department of TransportationUtah State Department