alt Hacker News> It's not hard to imagine the partially legitimate reason that on occasion, someone will drive with the trunk open
No, it's a much more serious and likely reason -- people stopping on a highway at night, getting out, and opening their trunk for some reason (like a spare tire, fluids, etc)?-- then their lights (and the reflectors in the lamp housings) are pointed at the sky.
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WalterBright • yesterday at 7:06 PM
My dad, in the 1960s, put reflective tape on the rear bumpers.
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Or, movable bodywork is more prone to be misaligned during normal operation.
Headlights get out of alignment sometimes. I posit that likelihood goes up if the lights are themselves mounted on a hood/door/whatever that can also go out of alignment.