The same number of signal emitting fixtures are installed between {HEAD ~ each nonstop intersection} and operated by {TAIL ~ the central control device} with the same frequency of cycling 
The same number of signal emitting fixtures are installed between { HEAD ~ each nonstop intersection } and operated by { TAIL ~ the central control device } with the same frequency of cycling
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH