running a shortest path algorithm with the current location and {TAIL ~ the destination location} or {HEAD ~ the destination region} 
running a shortest path algorithm with the current location and { TAIL ~ the destination location } or { HEAD ~ the destination region }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD