What are these things for?
February 21, 2007 10:32 PM Subscribe
Why do the traffic signals at a particular intersection have light-blocking louvers on them?
posted by aerotive to travel & transportation (10 answers total)
These traffic lights were installed about six months ago. There are two lights in quick succession, then an overpass, then two more lights. The first set of lights is about 30 to 40 yards apart, the same distance for the second set.
These louvers, or slats or whatever , prevent the light from being seen until you are very near the first signal in the set--then the light becomes visible quite abruptly. The slats are not effective at night, though they dim the light somewhat.
What is the purpose of these slats? Why would you want to make a traffic signal less visible?
No idea if this is relevant, but the replacement lights with these louvers are LED-based. The previous ones were old-style lights and none of the signals had these louvers.