LED traffic lights good for wallets, bad in snowstorm

MILWAUKEE — Cities around the country that have installed energy-efficient traffic lights are discovering a hazardous downside: The bulbs don’t burn hot enough to melt snow and can become crusted over in a storm - a problem blamed for dozens of accidents and at least one death.

“I’ve never had to put up with this in the past,” said Duane Kassens, a driver who got into a fender-bender recently because he couldn’t see the lights. “The police officer told me the new lights weren’t melting the snow.”

Many communities have switched to LED bulbs in their traffic lights because the lights use 90 percent less energy than the old incandescent variety, last far longer and save money. Their great advantage is also their drawback: They do not waste energy by producing heat.

Authorities in several states are testing possible solutions, including installing weather shields, adding heating elements like those used in airport runway lights, or coating the lights with water-repellent substances.

Short of some kind of technological fix, “as far as I’m aware, all that can be done is to have crews clean off the snow by hand,” said Green Bay, Wis., police Lt. Jim Runge. “It’s a bit laborintensive.”

In St. Paul, Minn., for example, city crews use air compressors to blow snow and ice off blocked lights.

Some communities began installing cool-burning LEDs more than a decade ago, and it wasn’t long before drivers started complaining about the problem.

Illinois authorities said that during a storm in April, 34-year-old Lisa Richter could see that she had a green light and began making a left turn. A driver approaching from the opposite direction did not realize that he had a red light because the stoplight was obscured by snow and he plowed into Richter’s vehicle, killing her.

“Would the accident have occurred if the lights had been clear? I would be willing to bet not,” Oswego police detective Rob Sherwood said.

Authorities said dozens of similar collisions have been reported in other cold-weather states, including Iowa and Minnesota.

Not every storm causes snow to stick to the lights, but when the wind is right and the snow is wet, drivers should beware, said Gary Fox, a traffic engineer for Des Moines, Iowa.

Exactly how much a technological fix will cost is unclear, but it will surely cut into the savings and the energy efficiency that the cities want.

Wisconsin, which has put LED bulbs at hundreds of intersections, saves about $750,000 per year in energy costs, said Dave Vieth of the state Transportation Department.

LEDs installed seven years ago are still burning, while most incandescent bulbs have to be replaced every 12 to 18 months, he said.

“With LEDs we have energy savings in excess of 80 percent, and we don’t have to have crews replacing them as often,” Vieth said. “So it’s clear the overall savings are pretty significant.”

In Minnesota, where authorities have upgraded hundreds of traffic lights to LEDs, the Transportation Department occasionally gets reports of an obstructed light. But by the time a highway crew arrives, the wind has often knocked out the snow and ice, said traffic systems specialist Jerry Kotzenmacher. Minnesota is experimenting with weather shields.

One reason there have been so few deaths is that drivers know they should treat a traffic signal with obstructed lights as a stop sign, traffic experts say.

“It’s the same as if the power is out,” said Dave Hansen, a traffic engineer with the Green Bay Department of Public Works. “If there’s any question, you err on the side of caution.”