First prize in this year's James Dyson Award has gone to London-based product design student Michael Chen, whose Reactiv jacket makes cycling in the city safer.
The Reactiv jacket uses an accelerometer to sense the rider's movement, changing the colour of LEDs on his or her back to green when accelerating, and to red when braking.
A tilt switch in the jacket makes LEDs in the sleeve flash amber when the cyclist lifts their arm to signal a turn.
James Dyson said: "Michael took a very real problem for cyclists visibility - and has engineered a solution. Reactiv is a brilliant safety device, especially when cyclists can be so vulnerable. The use of arm movements to operate the tilt switches and LEDs is especially clever".
The James Dyson Award is supported by the James Dyson Foundation, a registered charity whose aim is to inspire and excite young people about design engineering.
Michael is hoping to get his jacket into production, believing that it will reduce the 20,000 accidents involving cyclists on London roads every year.
