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SOMUA SM
SOMUA SM: experimental French heavy tank prototype (1946–1953) by SOMUA of Saint-Ouen, rival to the AMX-50, with 100-mm autoloader gun in an oscillating turret; one 56-tonne prototype built, scrapped after failed 1953 trials. Not a trolleybus.
Sonny Barger
Sonny Barger, born Ralph Hubert Barger, was an American motorcycle club leader who founded the Hells Angels' Oakland chapter in 1957 and became its de facto national leader.
Sons of Silence
The Sons of Silence Motorcycle Club is an American one-percenter motorcycle club founded in Niwot, Colorado, in 1966, grouped with the Hells Angels among the Big Five.
Souo S2000
The Souo S2000 is a luxury touring motorcycle from Souo Motorcycle, Great Wall Motor's brand, and the first with a flat-eight engine, launched in 2024.
South African National Roads Agency
The South African National Roads Agency (SANRAL) is a South African state-owned company, established in 1998, that plans, builds, and maintains the national road network.
South Carolina Department of Transportation
The South Carolina Department of Transportation (SCDOT) is the state agency responsible for South Carolina's highways, established in 1993. It maintains over 41,000 road miles, the fourth largest state-owned system in the nation.
South Dakota Department of Transportation
The South Dakota Department of Transportation (SDDOT) is the state agency responsible for South Dakota's 7,794-mile state highway system, plus aeronautics, rail, and transit programs, headquartered in Pierre.
South Luzon Expressway
The South Luzon Expressway (SLEx), originally the Manila South Expressway, is a Philippine toll road from Metro Manila to Calamba, Laguna, opened in 1969 and serving the CALABARZON region.
Spadina Expressway
The Spadina Expressway was a proposed north–south freeway in Toronto, canceled by Ontario Premier Bill Davis in 1971 after public opposition; only the William R. Allen Road was built.
Spaghetti junction
Spaghetti Junction is the popular name for the Gravelly Hill Interchange, the five-level junction where the M6 meets the A38(M) in Birmingham, England, opened in 1972.
Specialized Bicycle Components
Specialized Bicycle Components, also known as Specialized Bicycles, is an American bicycle maker founded by Mike Sinyard in 1974 and based in Morgan Hill, California.
Speed bump
A speed bump, also called a sleeping policeman, is a raised ridge across a road that forces vehicles to slow down, typically used in parking lots.
Speed camera
A speed camera is an automated traffic enforcement device that photographs the license plate of a speeding vehicle, and the owner or driver is sent a ticket.
Speed harmonization
Speed harmonization is an active traffic management strategy that gradually lowers and coordinates vehicle speeds upstream of congested freeway bottlenecks, reducing stop-and-go traffic and delaying flow breakdown.
Speed hump
A speed hump, also called a road hump, is a raised, gently curved pavement area on residential streets that forces drivers to slow to about 15 to 20 mph.
Speed limit
A speed limit is a legal maximum, and sometimes a minimum, for vehicle speed on a road, set by a government and enforced through traffic law.
Speed limiter
A speed limiter is a device or software function that prevents a vehicle from exceeding a preset maximum speed, typically by restricting fuel supply to the engine.
Speed limits by country
Speed limits by country compares legal maximum road speeds worldwide: typical urban defaults of 50 km/h, motorway limits of 120 to 130 km/h, and Germany's Autobahn with no general limit.
Speed limits in Germany
Speed limits in Germany, set by road type and signs, are 50 km/h in built-up areas and 100 km/h rural, while autobahns carry only an advisory 130 km/h.
Speed limits in the United States
Speed limits in the United States are maximum vehicle speeds set by individual states through state law or engineering studies, including Texas's 85 mph maximum.
Speed table
A speed table is a flat-topped raised area across a roadway, a traffic calming device that reduces speeds by 4 to 11 mph and can be striped as a raised crosswalk.
Speed Up (motorcycle manufacturer)
Speed Up is an Italian racing motorcycle constructor founded in 2010 by former grand prix rider Luca Boscoscuro to build Moto2 chassis, rebranded Boscoscuro in 2021.
Speeding
Speeding is driving a motor vehicle faster than the posted speed limit or too fast for road, weather, or traffic conditions, and it contributes to roughly one third of fatal road crashes.
Speedometer
A speedometer, also called a velocimetre, is the vehicle instrument that indicates speed in km/h or mph, commonly paired with an odometer; it was the first automotive instrument, patented by Otto Schulze in 1902.
Spirit of Ecstasy
The Spirit of Ecstasy, also known as the Flying Lady, is the hood mascot of Rolls-Royce cars, designed by Charles Robinson Sykes and registered in 1911.
Spoiler (car)
A spoiler is an aerodynamic device on a car, typically a lip on the trunk lid or front bumper, that disrupts airflow to reduce drag or lift, unlike a wing.
Sport bike
A sport bike, also written sportbike, is a motorcycle styled like a road racer, with streamlined bodywork and a forward-leaning position, built for handling, acceleration, braking, and cornering.
Sports car
A sports car is a production car designed for speed, high acceleration, and maneuverability, typically low-bodied and seating two, built for high-speed touring on ordinary roads.
Spyker Cars
Spyker Cars is a Dutch manufacturer of hand-built sports cars, founded in 1999 by Victor Muller to revive the Spyker marque, and known for its limited-production C8 series.
SsangYong Korando (쌍용 코란도)
The SsangYong Korando, sold as the Daewoo Korando and now the KGM Korando, is a South Korean compact SUV produced since 1983, whose name contracts the motto "Korean Can Do".