"Driver of the car was pushed underneath the tractor trailer in entrance"...why does the US not require tractor trailers to have bumper heights/reinforcement that could reduce this? I'm guessing simply because trucking providers foyer against it. In Germany, all trucks have this. Make it possible for far more adhering http://pulling-double-trailers83827.mybloglicious.com/28140643/new-step-by-step-map-for-pulling-double-trailers