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