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