Abstract: A turn signal for use on a motorcycle which incorporates means for automatic cancellation of the signal during completion of a turn. A normally open momentary contact push button switch is located on each side of the handle of the motorcycle, with each such push button switch in series with a self-latching relay that when energized switches on the appropriate turn indicator lamp. A mercury, normally closed, switch in series with the relay coil is mounted on each side of the handle and opens the relay coil circuit under the momentum of a turn to open the indicator lamp circuit.