Isn't the solution some sort of collision avoidance system that is used in airplanes? Or perhaps as a stop gap, some sort of add-on (passive?) device for operat

Isn't the solution some sort of collision avoidance system that is used in airplanes? Or perhaps as a stop gap, some sort of add-on (passive?) device for operators of vehicles that are frequently stopped can use to signal to autopilot vehicles that they are an obstruction to be avoided? It's a hack, but perhaps a necessary one?