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Department of Transportation (DOT)

DOT signifies that the tyre complies with the United States Department of Transportation tyre safety standards, and is approved for highway use.

The first two characters following DOT designate the tyre's manufacturer and plant code. The third and fourth characters denote the tyre size. The fifth, sixth, seventh and eighth (optional) characters identify the brand and other significant characteristics of the tyre. The ninth and tenth characters denote the week the tyre was produced. The final number signifies the year in which the tyre was manufactured. For Michelin tyres only the triangle indicates the decade of the 1990s. For the new millennium ETRTO standard tyres have adopted a four number DOT code. The last two numbers denote the year.