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