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