Honda Civic Owners Manual: Lane Departure Warning Function

Lane Keep Support Function

Provides assistance to keep the vehicle in the center of the lane. When the vehicle nears a white or yellow line, steering force of the electric power steering will become stronger. ...

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. ...

See also:

Honda Civic Owners Manual. Important Safety Precautions
Always wear your seat belt A seat belt is your best protection in all types of collisions. Airbags are designed to supplement seat belts, not replace them. So even though your vehicle is equipped with airbags, make sure you and your passengers always wear your seat belts, and wear them properl ...