Night caregivers / Bicycle taillights

In order to increase the sense of security when a bicycle lane changing, we use the concept of a level on a bicycle taillights, when you want to change lanes, the car will be where to touch the side of the tilt switch which side blinks. Thus it can remind the rear car to reduce the risk.
Center-left, the left light will automatically blink when straight, middle for maintaining flashes. Center-right, the right light will automatically blink