Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!newstop!jethro!exodus!oobleck.Eng.Sun.COM!bender From: bender@oobleck.Eng.Sun.COM (I want to be eating rich soup in another town) Newsgroups: sci.electronics Subject: Re: Traffic signals Message-ID: <11928@exodus.Eng.Sun.COM> Date: 19 Apr 91 22:03:42 GMT References: Sender: news@exodus.Eng.Sun.COM Organization: Sun Microsystems, Mt. View, Ca. Lines: 18 In article lrk@k5qwb.lonestar.org (Lyn R. Kennedy) writes: ->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 ^^^^^^^^^^^^^^^^^^^^^^^^ really? you mean it literally shorts the 110VAC coming into the traffic light controller? I assume then that some traffic engineer has to come by and reset the controller?? ->flashing mode. mike -- Won't look like rain, Won't look like snow, | DOD #000007 Won't look like fog, That's all we know! | AMA #511250 We just can't tell you anymore, We've never made oobleck before! | MSC #298726