{HEAD ~ A precautionary action system} installed in {TAIL ~ a vehicle} uses this database, or a database derived therefrom, in combination with a positioning system to take a precautionary action as the vehicle approaches such a location 
{ HEAD ~ A precautionary action system } installed in { TAIL ~ a vehicle } uses this database , or a database derived therefrom , in combination with a positioning system to take a precautionary action as the vehicle approaches such a location
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL 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