Directional tyre: A tyre having tread grooves swipe away in a backward direction from the center of the tread face and is meant to rotate…

Directional stability: Ability of a vehicle to travel straight ahead with minimum driver control.

Dimmer switch: A device to decrease or increase the brightness of the headlights by switching from high beam to low beam and vice versa.

Dimming mirror: A rear-view mirror located above the windshield which can be switched to reduce the glare from the headlights of a vehicle approaching from…

Differential: The arrangement to ensure equal speeds of the inner and the outer wheels of an axle while taking turns. In an ordinary differential, the…

Diagnostic trouble code: A numerical identifier for a fault condition detected by the on-board diagnostic system.

Diagnostic testing: Analysis of various functions of the components and systems of a vehicle to determine if they are operating properly or have recorded faults…

Departure angle: The angle between the ground and a line running from the rear tyre to the lowest hanging point directly behind it, which is…

Denver boot: Denver boot is also called wheel clamp, it is a locking device which wraps around the wheel of a vehicle to immobilize it.

De dion axle: De dion axle is invented by Count de Dion, the axle is used to achieve independent suspension-of a live axle.

Dampers: Commonly called shock absorbers, their function is to dampen i.e., absorb the oscillations of the suspension springs.

CVT: It is an automatic transmission that can select any desired drive ratio within its operating range. In other words, it is an 'infinite speed…

Curb weight: The weight of a vehicle without passengers or payload, but including all fluids (oil, fuel, coolant, etc.) and standard equipment or accessories. Sometimes…

Crossover SUV: An improved version of SUV having light weight and better fuel efficiency, now being produced on a unibody architecture, i.e., frameless construction. However,…

Coupe: A car with only two doors and a hard top. The SAE standard J1100 defines it as having less than 33 cubic feet (934…