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. To Set the Vehicle Speed
Take your foot off the pedal and press the -/SET button when you reach the desired speed. The moment you release the -/SET button, the set speed is fixed, and cruise control begins. The CRUISE CONTROL indicator comes on. During cruise control, Straight Driving Assist Function is acti ...