A lot of new cars come equipped with emergency braking systems, including affordable cars like Hondas. There has not been an increase in accidents due to these

A lot of new cars come equipped with emergency braking systems, including affordable cars like Hondas. There has not been an increase in accidents due to these systems, nor has there been an epidemic of cars autonomously slamming on their brakes on the freeway for no reason. So I tend to think the manufacturers got the engineering and safety trade-offs right for those cars. The big difference is that people who drive those cars do not generally expect that their cars are self-driving. Tesla owners do seem to expect that, and consequently the decisions made about trade-offs for, say, automatic braking in a Honda Accord are not the right decisions for a Tesla Model S. The bottom line is this: if people think their cars can drive themselves, the cars really need to be able to do that or there are going to be crashes.