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