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Archive for Wednesday, December 16, 2009

Money-saving LED traffic lights can’t melt snow

December 16, 2009

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This photo provided by the Oswego, Ill., police was taken after a fatal crash April 6. Oswego police Detective Rob Sherwood said the wind had blown the snow over the red light, causing a driver to run the light and hit the vehicle of 34-year-old Lisa Richter, who was making a left turn. She was killed.

This photo provided by the Oswego, Ill., police was taken after a fatal crash April 6. Oswego police Detective Rob Sherwood said the wind had blown the snow over the red light, causing a driver to run the light and hit the vehicle of 34-year-old Lisa Richter, who was making a left turn. She was killed.

— 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 from West Bend 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. How is that safe?”

Many communities have switched to LED bulbs in their traffic lights because they 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 labor-intensive.”

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 she had a green light and began making a left turn. A driver coming from the opposite direction did not realize the stoplight was obscured by snow and 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 the city of 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 many cities are enjoying.

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.

Minnesota, where authorities have upgraded hundreds of traffic lights to LEDs, 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.”

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