"Electric Eyes"

Radio Record, Volume III, Issue 9, 13 September 1929, Page 9

"Electric Eyes"

New FT rafic Control ne ae > "TT RAFFIC YRS, " which automatically control traffic lights, .when they see automobiles, are in use in Pittsburgh, U.S.A, says "Wireless Weekly." The purpose of this new system is to eliminate all: unnecessary traffic delays by giving the right of: way continuously to traffic on the main street interrupting the main traffic flow only when cars are actually waiting on the side street to cross the intersection. Motorists on one street are given a ereen or "go" signal continuously un-’ til a car on the cross-street comes within a short distance of the intersection, at which time the traffic signal mechanism starts to operate. and the lights go through a complete cycle, allowing traffic on the one street.to pass through and then stop again with the green light on the other street. The lights then allow’ traffic’ to proceed uninterruptedly on the ‘one street until the presence of. cars on the ,other street justifies another change. °