I can't say I know 100% that they work, I can only tell you that before I loaded them onto my truck on a dark freeway one night in 2006, I charged a group of 8 ran big bucks that literally, by the grace of God, something in my head warned me to slow down just a few seconds before and I didn't hit anyone. But it scared me and I've had these things on my truck ever since and haven't seen any deer on or near the freeway despite living in the country. These are my second pair since I painted my truck in 2017 and the guys took them off so I replaced them with these which I think are the same brand. It's always worth the small price. I think they help keep deer off the road.
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