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. Ignition Switch
Ignition Switch* Manual transmission models WARNING Removing the key from the ignition switch while driving locks the steering. This can cause you to lose control of the vehicle. Remove the key from the ignition switch only when parked. Continuously variable transmission models You ca ...