The action undertaken may be communicating to at least one of the vehicles potentially involved in the collision an indication of the collision prediction to enable the driver of the vehicle to initiate an action to prevent the collision, or automatically implementing a change in {HEAD ~ the movement} of {TAIL ~ one vehicle} 
The action undertaken may be communicating to at least one of the vehicles potentially involved in the collision an indication of the collision prediction to enable the driver of the vehicle to initiate an action to prevent the collision , or automatically implementing a change in { HEAD ~ the movement } of { TAIL ~ one vehicle }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL