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