When we find ourselves in the autonomous car-filled future, there will be many near misses.
Since these vehicles are likely to be battery powered, today’s invention is a way to make use of the massive torque available (beyond the potential for drag racing between the lights).
When a car senses that a collision is imminent, and steering out of trouble is not possible, then the vehicle can apply a sudden torque to the rear wheels and make the whole thing rear up out of the way -like a startled horse.
A flat back face allows the vehicle to park in that position until it can be safely rocked back onto its wheels.