I had not thought of Sucker666's reasone, but he's most likely right, privately used vehicles and I would add this. Company vehicles are not CMV's and are not subject to DOT regulations and neither are the drivers of those company vehicles. If we consider that if a CMV with equipped with an on board recorder is involved in an accident, especially a reportable one, all parties involved have the opportunity to see first hand, circumstances that led up to the accident. Given that the on board recorder was keeping the driver of the CMV honest, there is a good chance the driver and the company would be able to avoid a costly lawsuit by eliminating from the mix, "the driver is always guilty" variable. I am a driver/trainer and as such, I see the footage from the on board recorders and there are incidents, more than you may think, where the driver is doing nothing wrong at the time of the recording, and when that occurs, myself and my SCM take the driver's side. Personally, I'm willing to deal with a camera in my face for the added layer of protection I get in the event I get into a non-preventable accident because video doesn't lie and my case is already made.