for anyone using cameras in traffic (this is now police, bicyclists, motorcyclists, truck drivers, bus operators, pedestrians and even regular car drivers) these cameras are an asset to those who are safe and follow the rules, and a liability to those who are unsafe and don't follow the rules.
i highly suspect that video cameras will be REQUIRED in all new cars within a few years, built directly into the cars, record an 8-24 hour loop, and be illegal to tamper with (will the video be accessible to the vehicle's owner to download?). too many times when i was an EMT we'd get on a crash scene and struggle to figure out what happened: cameras built into cars will solve that problem when the police need to sort out the mess. no more he-said-she-said games. there will soon be an impartial witness at nearly every crash scene.