Autonomous vehicles should be parked on the road once they are 10 % better than human drivers , and waiting until they are 80 % or 90 % better to cause needless problems during the interim , according to the RAND Corporation . About 90 % of deaths are caused by driver error , it says .
Autonomous vehicles should be allowed on the road once they are 10% better than human drivers, and waiting until they are 75% or 90% better would cause needless deaths during the interim, according to the RAND Corporation. About 90% of crashes are caused by driver error, it said.