SAN FRANCISCO — All three major self-driving vehicle companies are facing federal investigations over potential flaws linked to dozens of crashes, a sign of heightened scrutiny as the fledging industry lays plans to expand nationwide.
The National Highway Transportation Administration (NHTSA) announced this month that it would examine two rear-end collisions involving motorbikes and vehicles operated by Amazon’s Zoox, which is already testing cars without steering wheels or brakes for passengers to operate.
