The first sensor is adapted to send input to the control device when triggered by a passing first vehicle on {HEAD ~ the first street} prompting {TAIL ~ the control device} to switch the lights to green for the first street 
prompting
The first sensor is adapted to send input to the control device when triggered by a passing first vehicle on { HEAD ~ the first street } prompting { TAIL ~ the control device } to switch the lights to green for the first street
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH