A bidirectional guide system for {HEAD ~ an axle} on a road vehicle guided by {TAIL ~ a guide rail} , the guide system comprising: 
A bidirectional guide system for { HEAD ~ an axle } on a road vehicle guided by { TAIL ~ a guide rail } , the guide system comprising :
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH