I have a dash cam, have been using it religiously over the last 18 months or so at work (much less so at home as I do less miles and the windscreen mount is rubbish)
I wasn’t an arrogant driver before, but its a reminder to back off or stop trying to look for an overtake when you do get impatient with a plodding numpty ahead. Also makes you think twice about creeping over a 30mph limit as if the Satnav is on it stamps your speed onto the video.
Didn’t cost me anything, its just my smartphone with ‘Dailyroads Voyager’ App installed. It records in a loop unless you or an impact signals it to save a clip.
Only real points it has caught so far is a driver that managed to miss me (my white Transit luton) and pulled straight out across my path, that was a little scary, a boy racer that pulled across my lane 1 of a dual carriageway from a side road, but couldn’t get out of the way as he wanted to queue in lane 2 and there was no gap, and a Jag I narrowly avoided rear ended after he slowed down suddenly, the gap between us naturally closed as I braked, and then as I increased the gap he noticed a level crossing was coming down so he swung into a side road to divert, but left it so late he crossed onto the wrong side of the road and had to jump on the brakes before he hit some bollards on a traffic island, leaving his rear end sticking out into the main road. I’d like to think that what would normally be my fault, would go the other way as his standard of driving on the video was clearly a large factor. Oh, and someone who drifted out of their lane whilst passing me on a dual and nearly took my front bumper off, and then gave me the finger when I flashed him 🙂