Dash cams are like a fire alarm: ideally, you’ll never need to use it, but you’ll really wish you had one if the need arises, particularly in a world where “crash for cash” are other insurance fraud is now commonplace. You don’t need to spend extortionate amounts of money to get a reliable, unintrusive little device though: the Z-Edge Z3, available for $100 from Amazon, does the job nicely.