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Collision
A motor vehicle crash, other than an overturning crash, in which the first harmful event is a collision of a motor vehicle in transport with another motor vehicle, other property, animal or pedestrian.
Centerline, Solid and Broken Line
A centerline that is both solid and broken indicates that passing is permitted in one direction.
Driver License Restrictions
Restrictions assigned to an individual's driver license by the license examiner, e.g. daytime driving only.
Commercial Motor Vehicle
Any self-propelled or towed motor vehicle used on a highway in interstate commerce to transport passengers or property when the vehicle (1) has a gross vehicle weight rating or gross combination weight rating or gross vehicle weight or gross combination weight, of more than 10,000 lbs or 4,536 kg or (2) used for commercial transport of more than 8 passengers (including the driver); or (3) is used for non-commercial transport of more than 15 passengers, including the driver; or (4) is used in transporting material found by the Secretary of Transportation to be hazardous under 49 U.S.C. 5103 and transporting in a quantity requiring placarding under regulations prescribed by the Secretary under 49 CFR, subtitle B, chapter I, subchapter C.
Advance Warning Area
Located after the first warning sign but before the work area.
Alcohol/ Involvement
Law enforcement suspected, and documented, that at least one driver or non-motorist involved in the crash had used alcohol. Includes both alcohol use under the legal limit and at or over the legal limit.
Centerline, Broken
A broken centerline indicates that passing is permitted.
Alignment
The geometric characteristics or layout of a roadway. Alignment is usually subdivided into horizontal alignment. Includes straight, curve left, curve right.
AASHTO
American Association of State Highway and Transportation Officials
Backing
A start from a parked or stopped position in the direction of the rear of the motor vehicle.
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