In order to maintain alternating nonstop traffic flow on the nonstop lane, three moving zones are marked along {HEAD ~ the fastroads} by signal emitting fixtures operated according to {TAIL ~ signal progression principles} 
In order to maintain alternating nonstop traffic flow on the nonstop lane , three moving zones are marked along { HEAD ~ the fastroads } by signal emitting fixtures operated according to { TAIL ~ signal progression principles }
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 OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL