Why should a driver check that wheelchair securement devices are properly locked in place after a passenger using a wheelchair has boarded?

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1. Wheelchair securement is optional as long as the passenger feels comfortable
2. Securement checks are required only at the end of the route, not after boarding, since most shifting happens gradually over a longer trip
3. An improperly secured wheelchair could shift or tip during travel, injuring the passenger
4. Wheelchair securement has no bearing on passenger safety during travel

Correct!

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