re emergency vehicle sensors traffic light phreaks in article linnig apr m dseg ti com linnig m dseg ti com mike linnig writes folks here in the dallas area i have noticed that it is quite common to see an odd sensor on top of traffic lights these have been here for at least six years i ve often wondered what they are mike linnig texas instruments inc of all statistics are made here in erie pa there is a system in the inner city called rado lite a trade name which allows police and ambulance vehicles to gain right of way by controlling traffic lights through radio signals the receivers look much like what you describe but they include a uhf whip antenna less than a foot tall and a light which flashes on and off to let traffic know that an emergency vehicle has taken control and is approaching local folklore says this system was invented here i don t know if this company has any other installations it has been in operation for at least years going only by my memory bob sciamanda edinboro univ of pa
