Many people want to do their bit to help save the planet, or to simply get fit, by riding a bike instead of using their vehicle. However, traveling on the road when the sun goes down can be off-putting for fear of not being seen by motorists. The Firefly light has been designed to address this concern by making them more visible. It uses a passive Infrared sensor to detect traffic approaching from behind the rider and projects light from flashing LEDs onto the back of the rider with varying intensity depending on the proximity of the traffic. The Firefly light is another shortlisted design submission in our ongoing series of the Australian Design Awards - James Dyson Award 2010.