Obstacles greater than ___ inches high, deep, or wide that cannot be removed must be ____.

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Multiple Choice

Obstacles greater than ___ inches high, deep, or wide that cannot be removed must be ____.

Explanation:
When you’re dealing with an obstacle in a pathway that can’t be removed, the goal is to make sure everyone sees it in time to avoid a collision. The rule uses 18 inches as the threshold, so any obstacle that is more than 18 inches high, deep, or wide and cannot be removed should be marked. Marking provides a persistent, visible cue at eye level and helps people navigate safely around the hazard without relying on temporary notices. Why this approach fits best: marking a permanent obstacle creates a stable signal that remains in place, reducing the chance of overlooking it. Flags are more suitable for temporary hazards or quick, movable warnings, but they can be easily lost or ignored if the obstacle is fixed. Smaller thresholds (like 12 inches) would flood the area with warnings, while larger thresholds (like 24 inches) might miss hazards that still pose a real risk. Hence, marking objects over 18 inches that can’t be removed is the prudent safety practice.

When you’re dealing with an obstacle in a pathway that can’t be removed, the goal is to make sure everyone sees it in time to avoid a collision. The rule uses 18 inches as the threshold, so any obstacle that is more than 18 inches high, deep, or wide and cannot be removed should be marked. Marking provides a persistent, visible cue at eye level and helps people navigate safely around the hazard without relying on temporary notices.

Why this approach fits best: marking a permanent obstacle creates a stable signal that remains in place, reducing the chance of overlooking it. Flags are more suitable for temporary hazards or quick, movable warnings, but they can be easily lost or ignored if the obstacle is fixed. Smaller thresholds (like 12 inches) would flood the area with warnings, while larger thresholds (like 24 inches) might miss hazards that still pose a real risk. Hence, marking objects over 18 inches that can’t be removed is the prudent safety practice.

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