Why do many American school buses sport those black stripes along their sides?

Why do many American school buses sport those black stripes along their sides? Are they racing stripes for the slowest race on earth?

Actually, those black stripes, known as "rub rails," aren't just for show. They serve a crucial safety function. Positioned at specific heights—typically aligning with the floor line, seat level, and window bottom—they reinforce the bus's structural integrity. In the event of a side collision, these rub rails help absorb and distribute the impact, protecting the passengers inside. So, next time you see those stripes, remember: they're the unsung heroes of school bus safety, keeping the wheels on the bus going round and round safely!
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