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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.
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.
Alignment
The geometric characteristics or layout of a roadway. Alignment is usually subdivided into horizontal alignment. Includes straight, curve left, curve right.
Centerline
A pavement marking used to separate traffic traveling in opposite directions. A centerline need not be at the geometrical center of the pavement.
Authorized Speed Limit
Authorized speed limit for the motor vehicle at the time of the crash. The authorization may be indicated by the posted speed limit, blinking sign at construction zones, etc.
Booster Seat
A "belt-positioning seat" that positions a child on a vehicle seat to improve the fit of the lap and shoulder seat belt system. This seat is recommended for children who weigh 40 pounds or more.
Curb
A raised edge or border to a roadway. Curbs may be constructed of concrete, asphalt, or wood and typically have a face height of less than 9 inches (225 mm).
Centerline, Solid and Broken Line
A centerline that is both solid and broken indicates that passing is permitted in one direction.
Backing
A start from a parked or stopped position in the direction of the rear of the motor vehicle.
AASHTO
American Association of State Highway and Transportation Officials
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