A Bike Indicator Alerts the Rear Vehicle Driver of Your Decisions on the Road. Indicators are used to alert the vehicles behind you or the ones in front of you, that you are going to change directions - making a turn (Left/Right - use it continuously until you have adjusted your direction and then switch off) It can also be used to change lanes in traffic quickly (Left/Right - use it for 2-3 blinks and then switch it off. By that time you should have changed your directions). It can also be used as Hazard /Warning Lights. It can be used when you have stopped your vehicle in traffic for some reason such as tyre puncture.