2009 Toyota Avalon Owners Manual - Page 456

6-1. Specifications Summer tire or all season tire (→P. 340) An all season tire has "M+S" on the sidewall. A tire not marked "M+S" is a summer tire. Typical DOT and tire identification number (TIN) DOT symbol* Tire Identification (TIN) Number Tire manufacturer's identification mark Tire size code Manufacturer's optional tire type code (3 or 4 letters) Manufacturing week Manufacturing year *: The DOT symbol certifies that the tire conforms to applicable Federal Motor Vehicle Safety Standards. 434