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