There's a bunch of cycling lights that do exactly this. Cycliq do some and you can get 2-3 hours of battery life between them. For commuting, they're great. Fo

There's a bunch of cycling lights that do exactly this. Cycliq do some and you can get 2-3 hours of battery life between them. For commuting, they're great. For my longer weekend rides, I tend to turn it on at the start/end of a ride, where the worst driving happens, then turn it off for the middle to save battery. There's a good few police forces across England and Wales that act on camera footage and hand out fixed penalty notices for dangerous driving. Usually this is: * Passing too close, especially at speed (40mph+) * Passing when it's not safe (usually into an oncoming car) * Jumping red lights I have noticed drivers are more aware of the lights, now, too. It's so stark that I can noticeably see an increase in dangerous driving when I've not got the camera, or it's switched off. It's a sad situation but the reality is that the only language some drivers understand is the threat that the police will take their toys off them if they don't behave.