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