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Centerline, Solid and Broken Line
A centerline that is both solid and broken indicates that passing is permitted in one direction.
AAMVA
American Association of Motor Vehicle Administrators
Advance Warning Area
Located after the first warning sign but before the work area.
Centerline
A pavement marking used to separate traffic traveling in opposite directions. A centerline need not be at the geometrical center of the pavement.
Deployed-Side Air Bag
Air bag on side of motor vehicle is deployed out of its cover and protruding into occupant compartment. Bag is fully or partially deflated or inflated.
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, Double
A double centerline indicates that passing is prohibited.
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.
AASHTO
American Association of State Highway and Transportation Officials
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).
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