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