Advocates for Highway and Auto Safety
American Association of State Highway and Transportation Officials
American Automobile Association
American Bus Association
American Trucking Associations
Commercial Vehicle Safety Alliance
Engine Manufacturers Association
Greyhound Lines, Inc.
Intelligent Transportation Society of America
International Brotherhood of Teamsters
International Transport Workers Union
Motor Coach Industries
National Private Truck Council
Owner-Operator Independent Drivers Association, Inc.
Parents Against Tired Truckers
Truck Manufacturers Association
U. S. Department of Transportation
     Office of the Secretary
     Federal Highway Administration
     National Highway Traffic Safety Administration
United Motorcoach Association