
The groove where the wear indicator is located is 1/16 inch (1.6 mm) shallower than elsewhere on the tire. If the tread has worn so that the indicator is exposed, replace the tire.
Worn out tires have poor traction on wet roads.
Temperature
Tire Service LifeHonda Civic Owners Manual. When the System can be Used
The system can be used when the following conditions are met.
The lane in which you are driving has detectable lane markers on
both sides, and
your vehicle is in the center of the lane.
The vehicle speed is between 45 and 90 mph (72 and 145 km/h).
You are driving on a ...