On Tue, 29 Nov 2011 19:00:55 -0800 (PST), "hr(bob) "
wrote:

On Nov 29, 6:23*pm, Metspitzer wrote:
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.

That makes more sense to me. I couldn't see a reason to build a
camera into a flashing red light.