Key control of the vehicle travelling direction. You thought it was in the car on Mody » No, this is a hard-working truck driver's daily lives. Driving trucks loaded with goods, in rugged mountain path on the driving, driving the need to perfect technology, always worried about the safety of cargo on board, the same can not be Biaoju as arbitrary! All this is to live to the direction keys to move, on the button before the trip, the next key back to stone. Experience under the truck drivers to do the hard!