Yes, but don’t let perfection be the enemy of good. I have personally wondered why this isn’t a thing, because it would help immensely at crosswalks. In Denmark, marked crosswalks give right of way to the pedestrian, but it is very hard to judge if a car is actually stopping or not until it’s already at the crosswalk. An indicator that the operator is actually pressing the brakes would make it safer to cross earlier and save everyone time.

This is not mutually exclusive with better street design.

harm minimization is good, too