[HPsquared]

It's the cars themselves that are dangerous. Whether people or robots are driving them. We used to have sensible regulation to ensure safety, which was unfortunately repealed, resulting in millions of avoidable deaths:

"...this restricted the speed (of horse-less vehicles) to 2mph in towns & 4mph in the country. The Act also required three drivers for each vehicle – two to travel in the vehicle and one to walk ahead carrying the infamous red flag."

https://law-school.open.ac.uk/blog/red-flag-act