Driving safety and hydroplaning indicator

Driving Safety Indicator (DSI) patented by Nokian Tyres has been made easier to use than ever before. The numbers indicating the groove depth and the water drop symbol indicating a risk of hydroplaning have been rotated to be immediately visible to a driver inspecting the tires installed on a vehicle. The water drop symbol disappears at the point that less than four millimetres(0.4 centimeters) of tread are remaining, indicating thereby an increased risk for hydroplaning.