OK, maybe you don't. I've tended to be a bit nit picky about what I download (lane discipline, people doing 45 in a 60 zone and staying at that speed when it drops to a 30 zone, etc). I've had a couple of weeks without my dashcam, and have had no incidents to report. So today, I put the card back in and wasn't expecting to be pulling the card out again any time soon, when this happens within ¼ mile of home: