American Association of State Highway and Transportation Officials (AASHTO)

American Society of Safety Engineers (ASSE)

American Traffic Safety Services Association (ATSSA)

California Department of Transportation (Caltrans)

Environmental Working Group (EWG)
Mean Streets from EWG and the Surface Transportation Policy Project analyzes the failures of our transportation system.

Federal Highway Administration (FHWA)
The FHWA is a part of the Department of Transportation and is headquartered in Washington, D.C.

Federal Highway Administration Pedestrian Safety

Federal Transit Administration (FTA)

International Municipal Signal Association (IMSA)
The Leading International Resource for Information, Education and Certification for Public Safety

Institute of Traffic Engineers (ITE)
Source of professional and technical documents and information on transportation standards and recommended practices. Offer publications on street design and traffic calming.

Manual on Uniform Traffic Control Devices (MUTCD)
The MUTCD contains standards for traffic control devices that regulate, warn, and guide road users along the highways and byways in all 50 States. United States Department of Transportation - Federal Highway Administration.

National Highway Traffic Safety Administration

Surface Transportation Policy Project (STPP)
National coalition of grassroots and national organizations which advocates for balanced transportation policy.

Transportation Research Board (TRB)

U.S. Department of Transportation (USDOT)