it uses infrared signal (from article) so u dont have to worry about FCC and was originally used by fire trucks and emergency vehicles. Man that's my next mod! Maybe i can find some on ebay.330Bimmer3 said:Thats crazy, do traffic lights have radio waves or something? Who ever figured that out is genious.
I'm right.330Bimmer3 said:Slow323 you need to write an article on this product and submit it to people trying to buy that piece...if your right, thats a total waste of money.
There are no pressure plates in the roads. In most places (signalized intersections) there are loops of wire in the road that sense a change in inductance when a big metal object like a car sits on top of them. The IR thing is for a totally different purpose. The vehicle sensors in the ground are used to tell the traffic signal controller that someone is waiting for the light to change. So that when it gets around to it the light will change. The IR sensor lets an emergency vehicle tell the light to change RIGHT NOW.Jeremy152 said:I haven't seen a whole lot of places that have that IR technology. Usually it's just the pressure plates in road used to change the lights.
Yep, those rubber hoses are simply for counting traffic temporarily. You might also see them used to open or close an automatic door or gate. They are just hollow tubes attached to an air switch. When a car squashes it, the air pressure goes up in the tube and triggers the switch.Jeremy152 said:Good lord - great explanation. So explain to me what those two rubber hoses are that are often taped half way across the road. Is that simply for counting traffic?