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RTR Vehicles
RTR Vehicles, short for Ready to Rock, is an American performance company founded by driver Vaughn Gittin Jr. in 2009, known for its Mustang RTR Spec series and Ford collaborations.
Ruf Automobile
Ruf Automobile GmbH, the German manufacturer founded in Pfaffenhausen, Bavaria, in 1939, began with Porsche-based conversions and became certified in 1981, best known for the 1987 CTR Yellowbird.
Ruf CTR
The Ruf CTR, also known as the Ruf CTR Yellowbird, is a twin-turbo sports car built by Ruf Automobile of Pfaffenhausen, Germany, from 1987 on a Porsche 911 shell.
Rumble strip
Rumble strips, also known as sleeper lines, are grooved pavement strips along road shoulders or center lines that alert drivers drifting out of their lane through noise and vibration.
Rumble strips
Rumble strips are milled grooves or raised elements on a road surface that alert distracted or drowsy drivers through vibration and sound, a standard countermeasure against roadway departure crashes.
Run-flat tire
A run-flat tire is a pneumatic tire designed to stay drivable for about 50 miles at 50 mph after losing pressure, letting drivers reach a safe place.
Runaway truck ramp
A runaway truck ramp, also called a truck escape ramp, is a road facility beside steep highway downgrades that safely stops vehicles whose brakes have failed.
Rush hour
Rush hour, also called the peak hour, is the part of the day when traffic demand on a road network is highest, typically during morning and evening commutes.
Ruta 27 (Costa Rica)
Ruta 27, known as the Carretera San José–Caldera, is a toll highway in Costa Rica linking San José with the Pacific port of Caldera, inaugurated in 2010.
Ruta Nacional 45A
Ruta Nacional 45A, known as the Troncal Central, is a Colombian national highway running from Zipaquirá in Cundinamarca to San Alberto in Cesar, crossing five departments.
Ryder (company)
Ryder, formally Ryder System, Inc., is an American logistics and transportation company headquartered in Coral Gables, Florida, founded in 1933 and serving more than 40,000 customers across North America.
Saab 9-3
The Saab 9-3, also known as the Saab 9-3 Turbo, is a compact executive car produced by Sweden's Saab from 1998 to 2011 in sedan, wagon, and convertible styles.
Saab 9-5
The Saab 9-5 is an executive car produced by Swedish automaker Saab in Trollhättan in two generations from 1997 until the company's bankruptcy in December 2011, replacing the Saab 9000.
Saab 9-7X
The Saab 9-7X was Saab's first SUV, a mid-size sport utility vehicle built by General Motors, sold in North America for the 2005 through 2009 model years.
Saab 900
The Saab 900 is a front-wheel-drive car built by Swedish maker Saab in two generations from 1978 to 1998, known for its turbocharged engines and convertible.
Saab 9000
The Saab 9000 is a large executive car built by Swedish maker Saab from 1984 to 1998, developed jointly with Fiat, Lancia, and Alfa Romeo and styled by Giorgetto Giugiaro.
Saab Automobile
Saab Automobile AB was a Swedish car maker in Trollhättan that grew out of an aircraft company and produced cars from 1949 until bankruptcy in December 2011.
Saab H engine
The Saab H engine is a family of four-cylinder petrol engines built by Saab from 1981 to 2009 for the 900, 9000, 9-3, and 9-5.
Sachsenring
The Sachsenring is a German motorsport circuit near Hohenstein-Ernstthal in Saxony, best known as the home of the German motorcycle Grand Prix, a MotoGP round.
SAE J2735
SAE J2735 is a technical standard from SAE International that defines the message set, data frames, and data elements used by vehicle-to-everything (V2X) communications, first issued in 2006.
SAE J3016
SAE J3016 is a recommended practice published by SAE International in 2014 that classifies vehicle automation into six levels, from Level 0, no automation, to Level 5, full automation.
Safe Routes to School
Safe Routes to School (SRTS) is a public program combining infrastructure, education, and encouragement so children can walk or bicycle to school safely. The US federal program ran from 2005 until 2012.
Safe System approach
The Safe System approach is a road safety strategy that treats traffic deaths as preventable system failures, pioneered in the 1990s by Sweden's Vision Zero and the Netherlands' Sustainable Safety.
Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users
The Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU) is a United States federal law enacted in 2005, guaranteeing $244.1 billion for highways, safety, and transit.
Safety bicycle
The safety bicycle, with two equal wheels and chain drive to the rear wheel, replaced the penny-farthing in the late 1880s and remains the standard bicycle design.
Sag (bicycle setup)
Sag is the percentage of its travel that a bicycle's suspension compresses under the rider's weight, the foundational step in setting up mountain bike suspension.
SAIC Motor
SAIC Motor (上汽集团), also called Shanghai Automotive Industry Corporation, is a Chinese state-owned automaker headquartered in Shanghai, China's largest with about 5 million vehicles built in 2023.
SAIC Volkswagen
SAIC Volkswagen (上汽大众), formerly Shanghai Volkswagen, is a 50:50 automotive joint venture between China's SAIC Motor and Germany's Volkswagen Group, founded in Shanghai in 1985.
SAIC-GM (上汽通用汽车有限公司)
SAIC-GM, known until 2015 as Shanghai GM, is a 50-50 joint venture between General Motors and SAIC Motor, founded in 1997 and headquartered in Shanghai.
SAIC-GM-Wuling
SAIC-GM-Wuling (上汽通用五菱) is a Chinese automotive joint venture, established in 2002 and headquartered in Liuzhou, Guangxi, that builds vehicles under its Wuling and Baojun brands.