I'm not sure about "necessary" but dash cams make even more sense for bikers. The default response for police in car-bike traffic accidents is to assume the bi

I'm not sure about "necessary" but dash cams make even more sense for bikers. The default response for police in car-bike traffic accidents is to assume the biker did something stupid and let the driver go or worse, issue a ticket to the biker without any evidence at all. See: http://greatergreaterwashington.org/post/19284/it-must-have-been-your-fault-cmon-you-are-a-biker/ http://greatergreaterwashington.org/post/19284/it-must-have-...