brake-sensitive bike light

Prototype of passive brake-sensing bike light

As the number of cyclists on London’s roads continues to increase, I found it strange that there has not been any real development of cycle safety gear for the urban environment in my recent cycling commutes.

While the visibility of cyclists to other road users has increased, communication between cyclists themselves hasn’t; given that cycles tend to accelerate and decelerate faster than cars, it was interesting that there are no commercially available bike lights that respond to this rapid change in speed. As such, after a particularly frustrating ‘rush hour’ cycle home, I developed a passive bike light, whose brightness is proportional to the braking deceleration.