The Driving Safety Indicator (DSI) placed numbers corresponding to the tread in 32nds of an inch on the tread's center rib. These numbers wear away with the tread and, as a result, they visually portray the tread wear rate along the tread area. The Winter Safety Indicator (WSI) places a snowflake on the tread. This snowflake represents the tire's winter weather performing ability. As the tread wears out, the snowflake will eventually wear away as well. The tire maintains its winter traction as long as the snowflake is visible on its tread. When it wears out and is no longer visible, the tire should not be driven in winter conditions. These indicators ensure a safer performing ability and driving safety in this manner.