All indicators on a vehicle are designed to let other road users know that a vehicle is about to make a turn or change lanes. The wing indicators allow for other vehicles to view this function from a side-on perspective rather than front or rear. The driverside wing indicator is found on the driver’s side of the vehicle just to the front of the driver’s door. When the indicator is operated the wing indicator will flash amber regularly until switched off. The indicator stalk is found on the steering column alongside other light switches and wiper controls. The indicators can either be switched off manually by the driver or they may automatically switch off if there is an auto-return mechanism fitted. This is activated when the steering wheel returns to the straight-ahead position after making a turn.

The amber colour of all indicators is achieved by either an amber coated bulb with a clear lens or a clear bulb with an amber lens.

The most common fault with indicators is due to the bulb having blown or that faulty contacts with the bulb-holder are stopping the power from the battery reaching the bulb.