I believe it could help prove which side was wrong. It could be usefull if I'm wrongly accused of speeding or having a red light. Or to know who has damaged the car while parked.
Some of those devices can record two video chanels, 3D g acceleration, GPS position (with speed), HD video (for plate and face identification).
I'm sure some of you have experimented such geeky device
Could you share your experience ? Is it efficent ? Is there any problem with it regarding your country/state's law ?"