Why should emergency exit windows and roof hatches be kept free of obstruction, such as stacked luggage placed against them?

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1. This concern applies only to exits located at the rear of the vehicle
2. Luggage placement near an exit has no bearing on evacuation speed
3. Exit obstruction rules apply only to the main entrance door, not windows or hatches
4. Blocked exits could delay or prevent passengers from evacuating quickly in an emergency

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