Bicyclists are arming themselves with a new tool in their battle with motorists over sharing the roadways: video cameras affixed to their helmets to record rude, threatening and even violent drivers. One D.C. biker captured a video on Aug. 31 of a driver in a black pickup yelling at him along Rhode Island Avenue, then apparently slamming into him with the back of his truck. The biker was knocked to the ground and taken to the hospital with injuries.

Now D.C. police are investigating the incident, reportedly using the video to track down the pickup driver. The Washington Area Bicyclist Association is also using that video to help push the D.C. Council to enact a tougher law to fight harassment and assaults of bicyclists.