Why is it critical for a school bus driver to walk to the rear of the bus after every route, checking every seat and the aisle, even if no students are believed to remain?

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1. This check is required only on the final route of the day, not every route
2. A visual glance from the driver's seat is always sufficient, so walking to the rear of the bus adds nothing to the check
3. Post-trip checks are purely a scheduling formality with no real safety purpose
4. A sleeping or hidden child could otherwise be left unattended on the bus, which has led to serious incidents in the past

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