CLEARER VISION ON A RAINY DAY Rain sensors save a driver from the constant distraction of having to flick the wipers to adjust the blade speed. A sensor at the base of the wipers detects the volume of rain falling on the windscreens and accordingly, adjusts the speed of the wipers. It uses two types of sensor – the acrylic fibre system that bonds a bracket for the sensors to the glass, and the silicon system, which bonds the sensor lens to the glass.