They started putting heaters in the traffic lights as he leds like mentioned don't melt the snow/iice off.
Here allot of the led traffic lights were swapped back to regular because the led units failed at an amazing rate and cost more to maintain than electricity costs. Usually about half the leds on the board would start to flicker then just go out all together. Traffic lights I go through everyday were dying within days of install.
In this case the hardware quality just isn't very good yet.
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