So cap the power, weight and speed of cars young people are allowed to drive. In the US you can only vote at 21, but you can join the army and kill people if you're 18 and in most states drive powerful cars at 16 (although subject to some conditions such as a curfew and limits on the number of underage passengers present in the vehicle). In most European countries one can only drive heavy quadricycles (<=450 kg curb weight, <=15kW, <=45 km/h by construction) at 16 years of age.
Same for autonomous vehicles: until the NTSB or whatever federal or state agency is responsible decides which tech is mature enough and issues licenses for a given AV system. A person has to have a driver's license, however AV systems do not. Why not certify which of them are able to operate heavier/more powerful/faster vehicles without human intervention (meaning they'd slow down to a stop when the driver would take his/her hands off the wheel).
Same for autonomous vehicles: until the NTSB or whatever federal or state agency is responsible decides which tech is mature enough and issues licenses for a given AV system. A person has to have a driver's license, however AV systems do not. Why not certify which of them are able to operate heavier/more powerful/faster vehicles without human intervention (meaning they'd slow down to a stop when the driver would take his/her hands off the wheel).