We were setting at an intersection yesterday in Alabama. Besides the
regular red light there was a single red light hanging, and it had a
white strobe that looked like it was part of the flashing red light
and it shined more at the bottom. One of the passengers said that
this is a camera to see who runs the red light.
Is he right?
In our area, western Chicago suburb of Naperville, emergency vehicles
can signal lights to turn red and flash a brilliant white strobe
light. Our strobe lights are usually not part of the actual traffic
light, but are mounted on the same crossarm that supports the traffic
signal itself. I don't kknow if there are any standards for such
lights, but they are becoming somewhat more common.
Most of the flashing lights I've seen at intersections were "attention
getters" at intersections where the red light might not be as
noticeable to drivers.
I've seen them on dark country roads so that the red light is noticed
by the driver who is cruising over the hillsides and I've seen them at
very busy intersections where there are lots of distractions such as
left hand turning lanes, lighted strip mall signs, etc.
I've never seen a camera built into a red light...in my area they are
covered with a blue dome.
No,speed cameras are set back from the intersection,so they include the
traffic light itself in the pic of your car being past the white stop bar.
Usually on a pole at curbside,they are a breadbox sized box,and may have an
extra box for the flash.
some traffic lights have an extra light so that police can tell that the
light is actually red in a particular direction without seeing the red
themselves.(because they are off to the side...).
The ones in my area change from white to blue when the traffic light is red
for that lane and direction.
I've also seen red lights that have a strobe built in,so that it draws
drivers attention better. eyes are naturally drawn to flashing or movement.
The light I saw looked exactly like this one except is was in a single
enclosure in addition to the regular red lights:
I was in the back seat in an unknown town in Alabama on 431 highway.
It was a pretty large intersection. At one time during the trip we
ran into a fire truck, but I can't be sure it was at the same time,
but it most likely was.
Read the section entitled "Why choose a Barlo Strobe Enhanced Traffic
It's basically says what I have been saying all along, including
references to the same things I mentioned in an earlier response:
visual noise (my example: strip mall lighting) and high speed
approaches (my example: long, straight country roads)
I'll save you throuble...here it is:
The Barlo Safety Beam traffic signal system has been designed to
enhance the normal illuminated red or amber section of the signal.
This is sometimes necessary because of intense background lighting
(visual noise), obstructed approaches, intersections that have
activities that distract the drivers attention, obscure rail-road
crossings, wrong-way warnings and high speed approaches that tends to
deceive the drivers perception of distance.
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