You focus it so its looking out the rear view screen, so it does not see the driver, etc, but yes it would be blocked if carrying loads of big/bulky stuff in the rear, which I never do, so it would not be an issue for me personally. I like the idea of a two in one unit.The problem with that one is that the rear view is from your rear view mirror so anything in the car can block it.........its more of an in car view that a rear view