Parsons design & technology student Nour Chamoun writes in about her responsive bike jacket:

The bike jacket is composed of 3 features:
1- 2 tilt sensors on each arm to sense the right or left motioning of arms, flashing lights indicating right or left.
2- An accelerometer to sense the deceleration of the cyclist, flashing a red warning light on the back of the jacket.
3- An infrared sensor to the left side of the cyclist to sense if any vehicles or other cyclists are getting too close and sets off a small vibrating motor to warn the cyclist.