They've been around in Minnesota for over a decade but these devices once again showed their usefulness in preventing another serious crash on a Minnesota highway.
Snowy and icy conditions have been widespread across Minnesota during this recent big snowstorm and a traffic camera just caught the scary moment a semi-truck jackknifed on a busy highway recently.
A MnDOT traffic camera caught the exact moment a fast-moving car slid on slippery pavement and careened right off a highway overpass in Minnesota recently.