Or a trunk, for that matter. It's not at 100 feet behind you that the trouble lies; mirrors are sufficient for that. It's the 1-5 feet behind you that you're

Or a trunk, for that matter. It's not at 100 feet behind you that the trouble lies; mirrors are sufficient for that. It's the 1-5 feet behind you that you're completely blind to with mirrors (assuming you don't have transparent rear seats and hatch).