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For example, in Iowa, IDOT performed a two-year study of using blue and white flashing lights on their snowplow trucks and found that the lights improved visibility and reduced accidents with motorists.‍

Your state may be changing their laws to include flashing, colored warning lights on their trucks. Many snowplow drivers in other states applaud the change because it means fewer accidents.‍

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You can read more on this popular trend of warning lights. Here are some news clips and articles from states where flashing, colored lights are used successfully on snowplow trucks:‍

“The Iowa Legislature modified the law in 2015 to allow for a three-year research project with blue and white lights in central Iowa. But DOT officials say the evidence from just two years of data is so clear that the [sic] third year of study isn’t necessary. They plan to ask state lawmakers in January to consider permanently authorizing the blue and white LED lights statewide on snowplow trucks.”‍

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Studies showed that there were fewer accidents between motorists and snowplow trucks as a result of different colored warning lights. However, state laws were on the books that only flashing lights were allowed to be on emergency vehicles.‍

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And before you know it, you’re getting too close to the truck. You hit the brakes a little too hard—momentarily forgetting that the roads are slick—and you’re sliding quickly toward the truck’s rear-end.‍

Back in 2014, Kent County, Michigan’s road commissioner saw the success of flashing green lights on trucks in Ohio. By 2016, Michigan DOT started using green flashing lights and constant burn amber lights on the back of their trucks.‍

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The good news: studies proved over and over again that there’s a reduction in car accidents involving snowplow trucks when colored, flashing lights are employed.‍

But some states, like Ohio, use green and amber lights on their trucks. So the laws needed to be re-written to include flashing green lights on Ohio snowplow trucks.‍

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Since 2012, various state DOTs have experimented using different types and colors of warning lights to alert motorists that they’re getting too close to the trucks.‍

The Center for Environmentally Sustainable Transportation in Cold Climates in Montana studied auxiliary and warning lights’ effectiveness.‍

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ODOT created a fact sheet on their website, after changing their laws in 2012, to include flashing colored lights on the back of all snowplow trucks.‍

We all do it. It’s snowing, and you’re behind a snowplow going 30 mph. You’re getting impatient, wanting to pass the truck as soon as possible.‍

These DOTs found LEDs work the best for warning lights—LEDs last longer, cost less and are the closest to actual daylight. And snowplow operators preferred amber and bright blue warning lights.‍

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However, LEDs don’t heat up enough to keep snow and ice from forming on them. So, DOTs experimented with mounting these lights high off the back of trucks with airfoils as well as lower on the back of trucks to avoid snow accumulation.‍

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Plus, snowplow drivers can now focus on getting the job done—rather than worrying about motorists trying to pass by them on a blustery, snowy night.‍

During a typical winter, there would be 29 car crashes involving snowplows. However, when trucks used flashing blue and white lights, there were only 10 car crashes involving snowplow trucks during that winter.‍