Main haulage levels with inadequate clearance shall be provided with shelter holes placed not more than thirty _____________ apart along the walkway side.

• A. meters
• B. yards
• C. feet
• D. inches

Answer: (A)

When haulage levels lack enough clearance, you need safe refuges close enough that a worker can reach one quickly during an emergency or when the main path is blocked. The rule requires shelter holes to be placed no more than thirty meters apart along the walkway side, so no one has to travel far to find shelter. The metric unit is used here to keep distances consistent with the safety code’s measurements, which is why thirty meters is specified. Other units like yards, feet, or inches aren’t used in this standard, so they wouldn’t match the required spacing.