I was 50/50 pn cameras for anything but recording a nice ride out and seeing some countryside....
But the last time I was knocked off was last April, when I overtook a camper van, who swerved right as I was alongside and pushed me onto the verge/stone wall on my right.....
No indication, obviously oblivious to my presence...
His side of events was that he indicated for a while and pulled over because he didn't think I was going to overtake, and then i overtook and drove into the side of him. It still isn't settled, and due to a lack of witnesses they're trying to get me to settle 50/50. I've already seen my premiums go up because the insurance companies assume an unsettled claim to be the same as 100% my fault. ( I don't know if i can claim back their overcharge when the case is finally settled ?)
Anyhow, a camera would have settled that the day afterwards.....
"Car mode" 
Does that just record over oldest vid's so you've always go the most recent "just in case"?
No, car mode means the camera is easily distracted, frequently stops seeing what's in front of it, and randomly deletes useful honest memories...