Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!evax!utacfd!letni!rwsys!kf5iw!k5qwb!lrk From: lrk@k5qwb.lonestar.org (Lyn R. Kennedy) Newsgroups: sci.electronics Subject: Traffic signals Message-ID: Date: 18 Apr 91 20:42:34 GMT Organization: Radio Amateur k5qwb Lines: 25 The Opticon units installed around here force the signal green to clear out traffic. The red-all-directions scheme has a safety fault: If it doesn't work, the emergency equipment may be racing into an intersection while the cross-traffic has a green light and the driver thinks it's red. One posting mentioned a system truning the lights green both ways when two emergency units approached from different directions. I hope they fired the guy if this is true. Traffic lights are supposed to have a safety device that monitors current to the opposing greens and if both are on it shorts the power line, forcing the system to the flashing mode. I just wish the traffic idiotjineers could make the signals work right without the extra goodies. ------------------------------------------------------------------------- lrk@k5qwb.lonestar.org lrk@k5qwb.UUCP 73, utacfd.utarl.edu!letni!rwsys!kf5iw!k5qwb!lrk Lyn Kennedy K5QWB @ N5LDD.#NTX.TX.US.NA P.O. Box 5133, Ovilla, TX, USA 75154 -------- "We have met the enemy and they are us." Pogo -----------------