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.
Honda Civic Service Manual. Steering Column Removal and Installation
SRS components are located in this area. Review the SRS component locations,
and the precautions and procedures before doing repairs or service.
1.
Battery Terminal (SRS) - Disconnection
1.
...