Automatic bike brake light

Good idea, the author took a cheap rear bicycle light and put some switches (homemade) to his brakes and it triggers the light.  My 2 cents.  I think I would have put them in the handlebars, maybe a contact switch that when the contact is broken, the circuit is completed thus turning on the light.

http://www.instructables.com/id/Brake-Lights-for-Bikes/