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Road salt
Road salt, also known as de-icing salt or rock salt, is sodium chloride spread on roads, parking lots, and walkways in winter to lower water's freezing point and melt ice.
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.
Road Traffic Safety Law of the People's Republic of China
The Road Traffic Safety Law of the People's Republic of China is the national statute governing road traffic in mainland China, adopted in 2003 and effective May 1, 2004.
Road train
A road train, or long combination vehicle, is a truck towing two or more trailers, used at scale in remote Australia to haul cattle and freight.
Road transport
Road transport, also called road transportation, is the movement of people and goods over roads using wheeled vehicles such as animal-drawn carts, cars, buses, and trucks.
Road Transport Department
The Road Transport Department, known in Malay as Jabatan Pengangkutan Jalan (JPJ), is Malaysia's agency for vehicle registration and driver licensing under the Road Transport Act 1987.
Road–rail vehicle
A road–rail vehicle, also called a hi-rail vehicle, is a vehicle or construction machine that travels on ordinary roads and on railway track, used mainly for rail maintenance.
Roadheader
A roadheader is a crawler-mounted excavation machine that cuts rock or coal with a rotating cutting head on an articulated boom, used in mining and tunneling.
Roadrailer
RoadRailer is a Wabash National bimodal freight system whose reinforced semi-trailers run on highways and rails without unloading, last operated by Norfolk Southern's Triple Crown until 2024.
Roads and Highways Department (Bangladesh)
The Roads and Highways Department (সড়ক ও জনপথ অধিদপ্তর), or RHD, is the Bangladeshi government agency that plans, builds, and maintains the national road and bridge network, established in 1962.
Roads in India
Roads in India, the Indian road network, form the world's second largest road system, carrying 65 percent of freight and 80 percent of passenger traffic.
Roads in Romania
Roads in Romania form a public network of about 86,847 km (2024), organized by law into motorways, express roads, European, main, and secondary national roads, and administered nationally by CNAIR.
Roads: Buraq → Dionysias
Roads: Buraq → Dionysias is a hypothetical Roman road in southern Syria heading south from Buraq to Dionysias, linked to an archaeologically attested segment near Umm ez-Zeitun/Omra.
Roads: Dionysias → Salamanestha
Roads: Dionysias → Salamanestha is a hypothetical Roman secondary road in southern Syria from Dionysias (es-Suweida) to Salamanestha (Sala/Saleh), per Barrington Atlas Map 69 and Bauzou 1985.
Roadside barrier
A roadside barrier is a safety device along a highway that contains or redirects errant vehicles, shielding them from hazards like steep slopes, trees, and bridge piers.
Roadside Design Guide
The Roadside Design Guide is an AASHTO manual presenting recommended practice for roadside safety, including the clear zone concept and barrier guidance, first published in 1989.
Roadside drug testing
Roadside drug testing is the on-site screening of drivers for recent drug use, usually by saliva swab, followed by laboratory confirmation when positive; used in Australia, Belgium, and New Zealand.
Roaming
Roaming, also known as international or mobile roaming, is the set of network functions and agreements letting a subscriber use services on a visited network outside their home operator's coverage.
Rob Fergus
Rob Fergus is a computer scientist and NYU professor known for spectral hashing and camera-shake removal, who co-founded Facebook AI Research and became its head in 2025.
Rob Pike
Rob Pike, also known as Robert Pike, is a Canadian-born American software engineer best known for co-creating the Go programming language at Google in 2009.
Robart
ROBART is a series of three experimental indoor security robots developed for the United States Navy between 1980 and 2007, beginning as Bart Everett's thesis project.
Robby the Robot
Robby the Robot is a fictional robot character who first appeared in the 1956 MGM film Forbidden Planet, designed by MGM art director Robert Kinoshita.
Robcad
Robcad is a 3D robot simulation and offline programming software package released in 1986 as the first product of Tecnomatix, now part of Siemens Digital Industries Software.