US Department of Transportation

NHTSA provides links to crash avoidance research documents.

The National Association of Motor Vehicle Administrators (AAMVA) and the National Highway Transportation Safety Administration (NHTSA) provides a driver fitness medical guideline booklet on its website. 

Brief summaries of research on alcohol-involved driving, drug-involved driving, occupant protection (e.g., seat belts, and child safety seats), speed and other unsafe driving behaviors. 

 By converting four-lane roadways to 3 (1 lane in each direction, with a center 2-way turning lane), road diets assist older drivers by making left turns safer, and help older pedestrians by reducing the crossing distance of the road.

A Case Study of Guidelines and Processes in Seven U.S. States. 

This volume updates the information presented in 2003 (Summary of Medical Advisory Board Practices in the United States).