Which component prevents wheelchair roll-off?

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Multiple Choice

Which component prevents wheelchair roll-off?

Explanation:
Wheelchair roll-off is prevented by a barrier that actively blocks the platform edge when needed. Retractable safety arms extend across the access opening, creating a solid barrier that stops a wheelchair from slipping past the edge. They deploy automatically when the platform is in a stop or loading state and retract to allow boarding and exiting. This targeted barrier is more effective for wheelchairs than a grab bar, which only offers balance support, or a fixed platform guard, which may not provide a complete or retractable protection. Direction push buttons don’t serve as a safety barrier at all.

Wheelchair roll-off is prevented by a barrier that actively blocks the platform edge when needed. Retractable safety arms extend across the access opening, creating a solid barrier that stops a wheelchair from slipping past the edge. They deploy automatically when the platform is in a stop or loading state and retract to allow boarding and exiting. This targeted barrier is more effective for wheelchairs than a grab bar, which only offers balance support, or a fixed platform guard, which may not provide a complete or retractable protection. Direction push buttons don’t serve as a safety barrier at all.

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