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The New York State Department of Transportation has identified a significant problem with LED traffic signals during winter weather. When replacing traditional incandescent lamps with low wattage LED modules, insufficient heat generation leads to snow accumulation on the lenses, particularly with wind-driven wet snow. Current practices involve temporarily placing intersections into an "All Red" phase, while maintenance personnel quickly remove snow using paint roller extensions equipped with brushes. Previous attempts to mitigate the issue, such as using snow scoops or pressurized fluids, proved ineffective.
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New York State Department of Transportation LED SNOW PACK 12/14/2010
Problem Description • With the installation of low wattage LED traffic signal modules replacing 135-150 Watt incandescent lamps, there is insufficient heat created by the LEDs to prevent snow from sticking to the lens of the LED modules. • The problem generally occurs with wind driven wet snow. Which tends to stick to the lens surface. Colder, dry snow does not stick to the lens.
New York State - Current Practice • Intersection is placed into ALL RED (we use the stop timing switch, catching a all red timing interval) • Traffic Signal Maintenance vehicles are pulled into the intersection to block traffic. • Personnel quickly remove packed snow with long paint roller extensions equipped with a brush. • This process takes less than 2 minutes.
Note signal in “All Red” and vehicles in intersection
Other Solutions Tried in NYSDOT • Snow Scoop Tunnel Visors. These devices provided no noticeable benefits, and in some cases resulted in additional snow stack on top of the hoods. • Pressurized windshield washer fluid. This was useful to remove packed snow but it didn’t prevent snow from sticking on lenses. • Use of Rain-X?
Greetings from New York! As you can see, snow pack is not the only problem in New York….
