In addition to planning for traffic impacts, Richards noted that vehicle preparation is critical to safe winter travel. Tires should be checked often for the correct level of air pressure and adequate tire-tread depth to perform on ice and snow. A quick way to check tread depth is to insert a penny in the tread groove with Lincoln’s head upside down. If you can see the entire head, the tires are worn and traction will suffer. If you live in an area prone to heavy snow, drivers may want to consider using dedicated snow tires or carrying a set of tire chains. At a minimum, all-season tires should be rated for use in mud and snow.
Source : https://www.thedailyreview.com/news/local/new-winter-travel-tool-to-inform-public-about-penndot-operations/article_ec0f23a0-b533-11e7-be5d-ab1b7a1bc0f8.html
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