What is the recommended speed limit for vehicles on unpaved haul/access roads?

• A. 20 mph
• B. 25 mph
• C. 15 mph
• D. 30 mph

Answer: (C)

The recommended speed limit for vehicles on unpaved haul or access roads is 15 mph. This speed is established primarily to minimize dust generation, which is a key concern under Rule 310, particularly in dust-sensitive areas. At lower speeds, vehicles are less likely to disturb the dust particles present on the road surface, resulting in decreased emissions of particulate matter into the air. Additionally, maintaining a lower speed enhances safety for both drivers and any personnel working in the vicinity of unpaved roads, as it allows for better control of the vehicle and reduces the likelihood of accidents.

By setting the limit at 15 mph, regulations aim to strike a balance between operational efficiency and environmental protection, ensuring that dust control practices are adhered to while still allowing for the transportation of materials as needed.