NHTSA | National Highway Traffic Safety Administration
https://www.nhtsa.gov/

Automated Driving Systems | NHTSA
https://www.nhtsa.gov/vehicle-manufacturers/automated-driving-systems

Voluntary Safety Self-Assessment | NHTSA
https://www.nhtsa.gov/automated-driving-systems/voluntary-safety-self-assessment

Automated Vehicles for Safety | NHTSA (html)