Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!mips!dimacs.rutgers.edu!rutgers!cbmvax!amix!undrground!seanp From: undrground!seanp@amix.commodore.com (Sean Petty) Newsgroups: sci.electronics Subject: Speaking of Traffic Signals.... Message-ID: Date: 22 Apr 91 21:38:58 GMT Lines: 23 Can anyone out there tell me what would be involved in building on of the 'Trippers' (as the local FD refers to them) that are used to turn the traffic lights green. I telephoned my local signal company, and they wanted ~$1500 for one! Why is it that these things cost so much money? It merely looks like a light-green strobe light to me. Can anyone explain the concept and workings behind both the 'tripper' and the receiver on the signal? Why does that flood light come on when it trips?? Any help is greatly appreciated. Sean ------- Sean Petty |INTERNET: undrground!seanp@amix.commodore.com | UUCP: uunet!cbmvax!amix!undrground!seanp "In order to make anything from | ICBM: 39.58.1' North 75.61.1' West scratch, you must first create | 50/50: seanp@undrground.UUCP the universe." - Carl Sagan | seanp@amix.commodore.com