4,460 articles
Rickshaw (人力車)
A rickshaw (人力車), from the Japanese jinrikisha, is a two-wheeled passenger cart pulled by a person, invented in Tokyo in 1870 and adapted worldwide into cycle rickshaws and motorized auto-rickshaws.
Ridge Route
The Ridge Route, officially the Castaic-Tejon Route, is a historic mountain highway in Southern California, opened in 1915 as the first direct road between Los Angeles and Bakersfield.
Riding boots
Riding boots are footwear for motorcycles and horses, characterized by a shaft that covers the ankle and a heel designed for grip and control, protecting the user during rides.
Right turn on red
Right turn on red (RTOR) is a traffic rule, used in the United States and similar regions, allowing a right turn at a red light after stopping unless prohibited.
Rijkswaterstaat
Rijkswaterstaat is the executive agency of the Dutch Ministry of Infrastructure and Water Management, managing the main road network, waterways, and flood defenses since 1798.
Rim brake
A rim brake is a bicycle braking system in which pads press directly against the wheel rim, the dominant brake for most of the 20th century.
Rimac Automobili
Rimac Automobili is a Croatian manufacturer of electric hypercars and automotive technology, founded by Mate Rimac in 2009, which merged its car business with Bugatti in 2021.
Rimac Concept One
The Rimac Concept One, also called the Concept 1, is a Croatian all-electric hypercar with four motors, one per wheel, built in eight units from 2016.
Rimac Nevera
The Rimac Nevera, formerly the Rimac C Two, is an all-electric two-seat hypercar built in Croatia by Rimac Automobili, unveiled in 2021 with 1914 hp and a 258 mph top speed.
Ring barrier controller
A ring barrier controller is a traffic signal controller, standard in United States practice, that organizes phases into rings meeting at barriers so conflicting movements never run simultaneously.
Rivian
Rivian Automotive is an American electric vehicle maker in Irvine, California, founded by RJ Scaringe in 2009, known for the R1T truck and Amazon delivery vans.
Rivian EDV
The Rivian EDV, or Electric Delivery Van, is an electric step-in van built by Rivian on its Commercial Van platform and designed with Amazon, its largest operator, with over 30,000 on the road by 2026.
Rivian R1T
The Rivian R1T is an all-electric pickup truck built by Rivian in Normal, Illinois, and introduced for the 2022 model year as the company's first consumer vehicle.
Rivian R2
The Rivian R2 is a midsize battery-electric SUV built by Rivian in Normal, Illinois, unveiled in 2024 and delivered from June 2026 at a starting price of $59,485.
Rivian R3
The Rivian R3 is an all-electric compact crossover that Rivian unveiled on March 7, 2024, alongside the R2 and R3X, with production planned in Georgia from 2028.
Road
A road is a prepared route over land, typically surfaced with asphalt, concrete, or gravel, that provides a durable track for vehicles, cyclists, and pedestrians to travel between places.
Road bicycle
A road bicycle, or road bike, is a lightweight bicycle with drop handlebars and narrow tires, built for paved surfaces and most often carbon-fiber framed, with racing versions restricted by UCI rules.
Road Development Authority (Sri Lanka)
The Road Development Authority (RDA) is Sri Lanka's apex state body for highways, managing the national road network and expressways since succeeding the Department of Highways in 1986.
Road Fund (United Kingdom)
The Road Fund was a UK government fund created by the Roads Act 1920, financed by motor vehicle license duties and abolished after hypothecation ended in 1937.
Road roller
A road roller, also known as a roller-compactor, is a heavy self-propelled engineering vehicle with wide steel drums used to compact soil, gravel, and asphalt on roads.
Road Safety Audit
A road safety audit (RSA) is a formal safety performance examination of an existing or future road or intersection by an independent, multidisciplinary team, originating in Great Britain.
Road Safety Authority
The Road Safety Authority (RSA; An tÚdarás um Shábháilteacht ar Bhóithre) is Ireland's statutory agency for driver licensing, vehicle standards, and road safety, established in 2006.
Road signs in Spain
Road signs in Spain are the standardized traffic signs and markings overseen by the Dirección General de Tráfico and defined in an official catalog updated in 2025.
Road signs in the Southern African Development Community
Road signs in the Southern African Development Community follow a harmonized regional system set out in the SADC Road Traffic Signs Manual, which member states agreed to implement in 2002.
Road signs in the United States
Road signs in the United States, also known as American road signs, are traffic control devices governed by the MUTCD, the national standard since 1935 that defines their shapes, colors, and messages.
Road speed limits in the United Kingdom
Road speed limits in the United Kingdom, also known as UK speed limits, are 30 mph on lit restricted roads, 60 mph on single carriageways, and 70 mph on motorways.
Road surface
A road surface, also known as road surfacing or street paving, is the top layer of a road pavement, usually asphalt or Portland cement concrete.
Road surface marking
A road surface marking, or pavement marking, is paint, thermoplastic, or tape applied to a roadway to communicate the intended vehicle path, lane divisions, and restrictions to drivers.
Road Traffic Act 1988
The Road Traffic Act 1988 is a United Kingdom Act consolidating the main statutory law on road traffic in Great Britain, including driving offenses, licensing, and insurance.
Road Traffic Regulation Act 1984
The Road Traffic Regulation Act 1984 is a UK Act governing road traffic in England, Wales, and Scotland, under which authorities make Traffic Regulation Orders and set speed limits.