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Scout Terra
The Scout Terra is a full-size electric pickup from Scout Motors, unveiled in 2024 with up to 350 miles of range and production targeted for 2027.
Sd.Kfz. 251
The Sd.Kfz. 251 (Sonderkraftfahrzeug 251), nicknamed the Hanomag, was a German half-track armored personnel carrier of World War II that carried panzer grenadiers alongside tanks.
SEAT
SEAT (Sociedad Española de Automóviles de Turismo) is a Spanish automobile manufacturer founded in 1950, headquartered at Martorell near Barcelona and owned by the Volkswagen Group since 1986.
Seat belt
A seat belt, also called a safety belt, is a vehicle restraint that reduces occupants' risk of fatal injury, most effectively in the three-point design Volvo introduced in 1959.
Seat belt laws in the United States
Seat belt laws in the United States are state laws requiring occupants to buckle up, enforced as primary or secondary laws; every state except New Hampshire has one.
SEAT Ibiza
The SEAT Ibiza is a B-segment supermini built by Spanish manufacturer SEAT since 1984, with over six million sold across five generations, including the fifth-generation car on the Volkswagen MQB-A0 platform since 2017.
SEAT León
The SEAT León is a C-segment small family car built by Spanish manufacturer SEAT at its Martorell plant near Barcelona since 1999, selling over 2.2 million worldwide.
SEAT Toledo
SEAT Toledo is a small family car produced by the Spanish manufacturer SEAT between 1991 and 2019. It was the first model to feature Volkswagen Group technology.
Seat tube angle
The seat tube angle is the angle between the horizontal and a line through the bicycle's seat tube, determining saddle position relative to the pedals.
Seatbelt pretensioner
A seatbelt pretensioner is a device that instantly retracts the seat belt at the start of a crash to remove slack and hold the occupant in place.
Seating capacity
Seating capacity, also called seat or spectator capacity, is the number of people a vehicle is designed to carry, including the driver, printed on the tire and loading placard.
Section 4(f) of the Department of Transportation Act
Section 4(f) of the Department of Transportation Act is a 1966 US law barring DOT agencies from approving projects that use parks, refuges, or historic sites when prudent alternatives exist.
Section control
Section control, also called point-to-point or average speed enforcement, measures a vehicle's average speed between two cameras several kilometers apart and prosecutes drivers exceeding the limit.
Security Credential Management System
The Security Credential Management System (SCMS) is a public key infrastructure developed for the US Department of Transportation to secure vehicle-to-vehicle communication while protecting vehicle owners' privacy.
Sedan (automobile)
A sedan, known as a saloon in British English, is a four-door passenger car with a three-box body: separate engine bay, cabin, and enclosed trunk behind a fixed rear seat.
Segway
The Segway, also called the Segway Personal Transporter, is a two-wheeled, self-balancing electric personal transporter invented by Dean Kamen, unveiled in December 2001 and discontinued in 2020.
Self-driving car
A self-driving car, also called a driverless or autonomous car, is a road vehicle whose automated driving system performs the entire driving task without a human.
Self-healing asphalt
Self-healing asphalt is pavement material engineered to repair its own microcracks through binder recovery or added technologies such as induction heating, microcapsules, and microbes, extending service life.
Self-propelled artillery
Self-propelled artillery, also called a self-propelled gun, is a howitzer mounted on a tracked or wheeled vehicle, able to displace quickly after firing to avoid counter-battery fire.
Semi-active suspension
Semi-active suspension is a vehicle suspension in which an electronic controller continuously adjusts the shock absorbers' damping to road conditions and load, improving comfort while consuming little power.
Semi-automatic transmission
A semi-automatic transmission, also called a clutchless manual or paddle-shift gearbox, is a car transmission where the driver picks gears while actuators work the clutch.
Semi-trailer
A semi-trailer is a freight trailer whose front rests on a tractor's fifth wheel, so the tractor bears part of its weight; the main North American freight hauler.
Semi-trailer truck
A semi-trailer truck, also called a big rig or articulated lorry, is a truck tractor coupled to a trailer whose weight partly rests on the tractor.
Seoul Ring Expressway
The Seoul Ring Expressway (서울외곽순환고속도로), renamed the Capital Region First Ring Expressway in 2020, is a 127 km toll expressway forming a ring around Seoul, fully opened in December 2007.
Sequential manual transmission
A sequential manual transmission is a manual gearbox that selects gears only in order, one step up or down, using a ratcheting drum instead of an H-pattern.
Serve Robotics
Serve Robotics is an American autonomous robotics company spun out of Postmates by Uber in 2021, operating over 2,000 Level 4 sidewalk delivery robots for Uber Eats and DoorDash.
Seward Highway
The Seward Highway is a 127-mile highway in south-central Alaska running from Anchorage south to Seward on Resurrection Bay, completed in 1951 and holding the federal All-American Road designation.
Sexton (artillery)
The Sexton was a Canadian-built self-propelled gun of the Second World War, mounting the British 25-pounder on a tank chassis and serving British and Canadian forces from 1943.
SFpark
SFpark was a federally funded pilot of San Francisco's transit agency that adjusted parking rates by demand, and became a permanent citywide program in 2014.
Shadow mode (automated driving)
Shadow mode, also called silent testing, is a validation technique for automated driving in which a candidate function runs passively on a vehicle without controlling its actuators.