Do you want it to capture possible accidents etc. or are you hoping to capture the journey for playback later. I think a lot of the dash cams record on a loop (I may be wrong) so will start over writing previous recordings. If you want to record the trip for posterity then go for a Go Pro if you're feeling flush or one of the Chinese clones like the Qmox SJ series which a few people on here have and are really impressed with.
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