The National Highway Traffic Safety Administration expresses its appreciation to the following law enforcement and highway safety agencies whose contributions made the development of this guide possible:

Arizona Department of Public Safety

Albuquerque Police Department

California Highway Patrol

Colorado State Patrol

Connecticut State Police

Delaware State Police

Fairfax County Police Department, Virginia

Florida Highway Patrol

Howard County Police Department, Maryland

Illinois State Police

Iowa Highway Safety Office

Los Angeles Police Department, California

Maryland State Police

Massachusetts State Police

Michigan State Police

Minnesota State Patrol

New York State Police

Ohio State Highway Patrol

Oklahoma City Police Department, Oklahoma

Ontario Provincial Police, Ontario, Canada

Orange County Sheriff’s Department, California

Peel Regional Police Department, Ontario, Canada

Pennsylvania State Police

Richardson Police Department, Texas

St. Petersburg Police Department, Florida

Utah Highway Patrol

Virginia State Police

Washington Metropolitan Police Department, District of Columbia

Washington State Patrol