10-17-2003, 01:36 PM
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Confirmed User
Join Date: Jan 2003
Location: Hollywood, CA
Posts: 3,569
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Quote:
Originally posted by Armed & Hammered
Actually, on some older lights, it DOES work. Modern lights can't be changed this way. I used to work for a company that installed emergency equipment and 2-way radios in police cars, fire trucks, ambulances, etc. What actually changes the light (especially on ambulances) is called an Opticon. They (the recievers) are installed on a lot of major intersections and usually look like a black beer can with a little pipe sticking out the front, usually pointing towards the flow of traffic. There are several variations but most look like that.
On vehicles is the Opticon strobe. Modern versions look like a regular strobe light. They are usually mounted in the center of the main lightbar and flash at a steady rate. The Opticon traffic preemption reciever on the stop light will notice the flashing and if it is the correct frequency, will change the stop light.
There's a hefty fine for having your own Opticon but I *hear* that there is an infrared version available that can hardly be seen.
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good stuff, maynard! 
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