It's just a proactive measure in case you are in an accident. Then there is some documentation of what happened. It's just a safety thing. I've never had to use mine, knock on wood, but i've only had it for about 8 months. I don't make youtube videos of bad drivers, but I suppose you could.
It's in the car all the time, it's permanent. I hardwired mine in. I have both my radar detector and dash cam running off a tapped auxiliary fuse. All wires are run hidden for a clean look. A lot of people just use the cigarette lighter method, maybe because of laziness or lack of electrical knowledge, but they are really not that hard to hardwire yourself with some basic knowledge.
Camera comes on when I turn the car on. Camera goes off when I turn the car off. I have a 16 gig card (I think) in the camera and it just loops over itself. It's 4 - 6 hours of HD recording. My camera also records GPS location and speed.
There are cameras on the market that will turn on when it senses motion. If you are parked in a parking lot and someone is backing up, the camera will turn on and if that person happens to back into you, you will have a recording of it.
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