An automatic turn signal deactivation system monitors and deactivates a turn signal indicator for a vehicle. A lane departure warning device compares a vehicle position with an originating roadway lane and provides a monitoring signal to a communication bus. A turn signal module activates the turn signal indicator under manual control and automatically deactivates the turn signal indicator in response to the monitoring signal when the monitoring signal received from the lane departure warning device over the communication bus indicates that a lane change maneuver is complete.