Variable gear ratio mechanism variably sets {HEAD ~ a ratio} defining a pivot angle of {TAIL ~ steered wheels} of the vehicle to a steering angle of a steering wheel of the vehicle 
Variable gear ratio mechanism variably sets { HEAD ~ a ratio } defining a pivot angle of { TAIL ~ steered wheels } of the vehicle to a steering angle of a steering wheel of the vehicle
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH