Comment by kragen

These cars need an emergency stop button which brings the car to a halt as fast as could plausibly be safe and then opens the doors. This is standard equipment on all industrial machinery and used to be standard equipment on all trains as well; I got into a lot of trouble once for pulling the emergency stop cord on a train when I was young. The inconvenience and occasional danger of unwarranted emergency stops is almost certain to be outweighed by the lives saved in the rarer cases where the E-stop is necessary.