The U.S. Department of Transportation markings signify that the tire meets DOT tire-safety standards. The DOT markings help track the tire in the same way a lot number tracks a food product.
- The first two characters designate the tire manufacturer and plant code. This could be important if the tire receives a safety recall.
- Characters three and four denote the tire size.
- The fifth, sixth, seventh and eighth (optional) characters identify the brand as well as other characteristics important to the manufacturer.
- The final four numbers denote the date the tire was produced. The first two indicate the week, and the last numbers specify the year.