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By DINESH RAMDE, Associated Press Writer Dinesh Ramde, Associated Press Writer
Tue Dec 15, 8:41 pm ET
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
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.
"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."
___
Associated Press writers Patrick Condon in Minneapolis and Melanie Welte in Des
Moines, Iowa, contributed to this report.
(This version CORRECTS corrects figures on Minnesota lights.)