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Road Terms

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Term Description


To increase the speed of a vehicle

Aerial Speed Enforcement

A method of speed enforcement using premeasured distance markers, visible from the aire, to determine the speed of vehicles on the gournd. A pilot and spotter, in fixed-wing or rotary aircraft, 'clock' vehicles and radio a description of the offender's vehicle to officers on the ground who intercept the vehicle and isuue a citation.

Air Bag

The air bag, also known as a Supplemental Inflatable Restraint System, is a passive safety device, supplemental to safety belts, that inflates to provide a cushion to absorb impact forces during moderate to severe frontal collisions. This system can help to lessen the chance of contact with the steering wheel, instrument panel and windshield. The air bag is actuated automatically by sensors located in the front of the vehicle. To maximize effectiveness, seat and shoulder belts must always be used in conjunction with this system.

Air Filtration System

It purifies both interior circulated air and outside polluted air. It gets rid of smog, pollen, exhaust, smoke and odors.


An aerodynamic device designed to improve traction by increasing the downforce on the car. The use of airfoils (also called wings) increases the cornering capability and improves stability at speed, but often at the expense of additional aerodynamic drag.


A street or highway intended to provide access to the rear or side of lots or buildings in urban districts and not intended for the purpose of through vehicular traffic.


Trucker slang for a low overpass.


An obstruction (e.g., plate or vane) used to slow down or divert the flow of gases, liquids, sound, etc. They are found in the fuel tank, crankcase, muffler, and radiator.

Balance Shaft

A shaft designed so that, as it turns, it counter rotates the rotational direction of the engine crankshaft in a manner that reduces or cancels out some of the vibration produced by the engine.


Trucker slang for a deer

Banked Turn

A turn that's inclined so the outside area is higher than the inside area.


The sloping of a race track, particularly at a curve or corner, from the apron to the outside wall. Degree of banking refers to the height of a track's slope at its outside edge.

Bash Plate

A protective plate placed under the engines of off-road machines. This avoids damage caused by grounding.


Big F$%#ing Truck. An average/large truck that has been lifted and placed on oversized tires and wheels. Usually driven by rednecks or teenage males with ego issues.


1) Any road, path, or way which in some manner is specifically designated as being open to bicycle travel, regardless of whether such facilities are designated for the exclusive use of bicycles or are to be shared with other transportation modes.

Blind Spot

Areas around a commercial vehicle that are not visible to the driver either through the windshield, side windows or mirrors.


The diameter of the cylinder bore.

Brake Master Cylinder

A cylinder containing a movable piston activated by pressure on the brake pedal. The piston produces hydraulic pressure that pushes fluid through the lines and wheel cylinders. This forces the brake lining or pad against the drum or disc to slow or stop the car.


This term refers to a stretch of surface road that connects two different freeways, or two different stretches of a single one, without any direct connection via an interchange. Usually, these roads are filled with traffic lights, gas stations, fast food joints, etc. The original example is in Breezewood, Pennsylvania, where I-70 follows surface US 30 for a quarter mile where it meets the Pennsylvania Turnpike.


A structure that divides compartments. It

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