This system operates at a maximum speed of 50 km / hr for preventing collisions with stationary vehicles and 40 km / hr for rear collisions. (motorbeam.com)
Operating at maximum speed, that should allow two - thirds of a person in - and - out each second. (canadianbusiness.com)
If science has limits, then it might be moving at maximum speed just before it hits the wall. (discovermagazine.com)