A vehicle tracking system includes a wheel unit containing circuitry capable of sensing various types of conditions, such as {HEAD ~ specific electromagnetic and magnetic signals} indicative of {TAIL ~ particular wheel locations} 
A vehicle tracking system includes a wheel unit containing circuitry capable of sensing various types of conditions , such as { HEAD ~ specific electromagnetic and magnetic signals } indicative of { TAIL ~ particular wheel locations }
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 HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL