4,460 articles
Drug recognition expert
A drug recognition expert, also called a drug recognition evaluator, is a police officer trained to recognize drivers impaired by drugs other than or in addition to alcohol.
Drugged driving
Drugged driving is operating a vehicle while impaired by illicit, prescription, or over-the-counter drugs besides or alongside alcohol, and it is illegal in all 50 US states.
Drum brake
A drum brake is a vehicle brake in which brake shoes press against the inside of a rotating drum; dominant through the 20th century, it remains common on rear axles and heavy trucks.
Drunk driving in the United States
Drunk driving in the United States is driving with a blood alcohol level of 0.08 or higher, causing about 30 percent of U.S. traffic deaths.
Drunk driving law by country
Drunk driving law by country, also called drunk driving laws throughout the world, covers national legal limits on blood alcohol concentration for drivers and their penalties.
Drunk driving recidivism
Drunk driving recidivism is the repetition of an impaired-driving offense (DWI, DUI, or OWI) by a person already arrested or convicted for one, typically measured by rearrest.
Dry van trailer
A dry van trailer is an enclosed, unrefrigerated semi-trailer that hauls palletized freight needing weather protection but no temperature control, the most common type in North American trucking.
DS Automobiles
DS Automobiles is a French premium car marque founded in Paris in 2014, positioned above Citroën within PSA and now Stellantis, selling the DS 3, N°4, N°7, and N°8 in 40 countries.
DS No. 4
The DS No. 4, also styled DS N°4, is a compact premium hatchback from DS Automobiles, Stellantis's premium marque, sold as the DS 4 until the 2025 facelift.
DS No. 8
The DS No. 8 (DS N°8) is a battery-electric SUV coupé and flagship of DS Automobiles, unveiled in December 2024 with a WLTP range of up to 466 miles.
Dual carriageway
A dual carriageway is a road where traffic in the two directions is separated by a central reservation; in the United States it is called a divided highway.
Dual-clutch transmission
A dual-clutch transmission (DCT), also called a twin-clutch gearbox, is an automotive gearbox combining manual-transmission efficiency with automatic shift comfort, pre-selecting the next gear on a second clutch so shifts occur without traction interruption.
Dual-mass flywheel
A dual-mass flywheel is a vehicle flywheel split into two masses connected by springs to filter engine vibration, developed by LuK and mass-produced from around 1985.
Dual-sport motorcycle
A dual-sport motorcycle, also called dual-purpose or all-road, is a street-legal motorcycle usable both on pavement and off-road, typically with a 250 to 650cc single-cylinder engine.
Ducati
Ducati is an Italian motorcycle manufacturer based in Bologna, founded in 1926, known for sport bikes with desmodromic valve gear and a racing program with MotoGP and Superbike titles.
Ducati 1199
The Ducati 1199 Panigale is a 1199 cc sport motorcycle produced by Ducati from 2012, the first superbike with an aluminum monocoque chassis and a name alongside its capacity number.
Ducati Monster
The Ducati Monster is a naked roadster motorcycle built by Ducati in Borgo Panigale, Italy, since 1993, designed by Miguel Galluzzi and Ducati's best-selling model.
Ducati Panigale V4
The Ducati Panigale V4 is a superbike motorcycle built by Ducati in Bologna and the first production Ducati to use a four-cylinder engine, derived from its MotoGP racer.
Duesenberg
Duesenberg was an American luxury automobile built in Indianapolis from 1921 to 1937 by the Duesenberg brothers, whose Model J was advertised as the finest car in the United States.
Duesenberg Model J
The Duesenberg Model J, or Duesenberg J, is an American ultra-luxury car built in Indianapolis from 1928 to 1937, billed as the world's finest motor car.
DUKW
The DUKW, nicknamed the duck, was a six-wheel-drive amphibious truck built for the US military in World War II, ferrying supplies ashore from Sicily to Normandy.
Dump truck
A dump truck, also known as a tipper lorry, is a truck with an open-box bed raised by a hydraulic hoist to unload sand, gravel, or debris.
Dune buggy
The dune buggy, also called a beach buggy, is a lightweight recreational vehicle built or modified for driving over sand, popularized on the California coast in the 1960s.
Dunlop pneumatic tire bicycle
The Dunlop pneumatic tire bicycle carries the air-filled tire that John Boyd Dunlop, a Scottish veterinary surgeon in Belfast, developed for his son's tricycle in 1887–1888 and patented.
Dunlop Tyres
Dunlop Tyres is a premium tire brand originating from the pneumatic tire patented by John Boyd Dunlop in 1888, now owned by Sumitomo Rubber Industries.
Duryea Motor Wagon Company
The Duryea Motor Wagon Company, founded by brothers Charles and Frank Duryea in Springfield, Massachusetts, in the 1890s, was the first American company to manufacture and sell automobiles.
Dymaxion car
The Dymaxion car, also called the Fuller Dymaxion, was a streamlined three-wheeled prototype automobile designed by Buckminster Fuller and Starling Burgess, built in Bridgeport, Connecticut, in 1933 and 1934.
DynaMIT
DynaMIT (Dynamic Network Assignment for the Management of Information to Travelers) is a simulation-based traffic estimation and prediction system developed at MIT, whose prototype appeared in 1998.
DYNASMART
DYNASMART is a simulation-based dynamic traffic assignment model developed at the University of Texas at Austin that combines network traffic simulation with routing of individual vehicles.
E-scooter
An e-scooter, also called an electric kick scooter or motorized kick scooter, is a battery-powered scooter used privately or in dockless rental fleets across 600-plus cities.