[silax]

Most cars have this starting in 2016. Later this year every single car will be mandated to have automatic emergency braking. At least Tesla will have millions of miles of practice. https://www.consumerreports.org/car-safety/most-new-cars-hav...

[pandaman]

Most (all?) other cars have radars for this. They do not seem to experience as many problems as Teslas, which is especially telling considering how much more other cars are on the road.