Cool idea, and well done to Michel Chen for his invention and it pocketed him a cool £5000 cash plus £1000 towards his former university in the James Dyson international design awards. It's a cycling jacket that changes colour when you slow down, or when you turn left or right, and of course, when you are stopping.
Found this via BBC video of his interview: http://news.bbc.co.uk/2/hi/technology/7345902.stm
Beeb article on it: http://news.bbc.co.uk/newsbeat/hi/technology/newsid_7340000/7340963.stm
He's been picked up by many sites, including Gizmodo.