Maintaining haul roads is one of the highest-leverage activities in surface mining and heavy construction. Because haulage can account for up to 50% of total operating costs, even minor improvements in road quality yield significant returns in fuel efficiency, tire life, and mechanical availability [1]. The best practices below focus on balancing the cost of maintenance (graders, water trucks) against truck availability (reducing breakdowns and cycle times).
Geometric & structural design
The foundation of road maintenance is a design that minimizes the need for it. The ideal grade is between 8 and 10 percent with low rolling resistance of 2 percent or less [2]. Frequent grade changes force trucks to shift gears, which increases drivetrain wear and causes “wheel spin” that damages the road surface.
Bank curves so that centrifugal force is neutralized [2]. This prevents “ply separation” in tires and lateral stress on truck frames, which are leading causes of unplanned maintenance. Standardize roads to 3.5x to 4x the width of your largest truck for two-way traffic [3]. Narrow roads cause trucks to drive near the edges (berms), leading to shoulder failure and drainage issues.
Rolling resistance management
Rolling resistance is the “invisible” cost killer. A 1% increase in rolling resistance can decrease truck speed by 10% and significantly increase fuel burn [4]. It is important to use well-graded sub-base materials that provide a stiff, unyielding surface [5]. Soft or “spongy” roads allow tires to sink, increasing fuel consumption and heat buildup in the rubber [2]. Maintain a 2–4% cross-fall (crown) on straight sections. This ensures water runs off into side ditches rather than pooling, which prevents the formation of potholes and soft spots.
Precision dust & water control
Over-watering is a common mistake that actually increases operating costs. Excessive water turns surface fines into “slurry,” which acts as a lubricant for rocks to cut into expensive tires [6]. It also increases rolling resistance. Consider using bitumen emulsions, polymers, or lignosulphonates. While they have an upfront cost, they can reduce water truck requirements by up to 90% and grading frequency by 70%, keeping trucks moving faster and more safely.
Strategic maintenance tactics
Instead of “reactive” grading, use data to prioritize road crews [7]. Modern haul trucks can transmit “frame rack” and “strut pressure” data [7]. Use this to identify specific 100-meter sections of road that are causing the most mechanical stress and dispatch graders there immediately.
These areas are the most prone to spillage. A single rock in the loading pocket can ruin a $50,000 tire. Dedicated “spot” maintenance in these zones has a higher ROI than general road grading. Train grader operators not to just “spread the dirt,” but to cut out the “pot-hole” floors [8]. Simply filling a hole with loose material ensures it will reappear within hours.
Maintenance of the haul road has to achieve a balance that meets the performance level in accordance to the expenditure costs incurred. When done excessively, it leads to wastage of costs, whereas under-investing in maintenance leads to an increase in truck costs. Effective maintenance involves taking corrective measures in accordance to actual conditions, grading, moisture, and monitoring performance levels. Linking maintenance to data related to haulage enhances efficiency levels in reaching decisions. Effective maintenance programming maximizes truck utilization levels by reducing overall life-cycle costs.
Reference
[1] “Mine Haul Roads.” Accessed: Jan. 15, 2026. [Online]. Available: https://renolith.com.au/mine-haul-roads/
[2] “9 ways to ensure haul roads are an asset — not a liability,” catDotCom. Accessed: Jan. 15, 2026. [Online]. Available: http://www.cat.com/en_US/blog/ensure-haul-roads-are-an-asset.html
[3] “Haul Road Maintenance | Agg-Net.” Accessed: Jan. 15, 2026. [Online]. Available: https://www.agg-net.com/resources/articles/loading-hauling/haul-road-maintenance
[4] “Mine Haul Road Design And Management Best Practices For Safe And Cost-Efficient Truck Haulage,” OneMine. Accessed: Jan. 15, 2026. [Online]. Available: https://onemine.org/documents/mine-haul-road-design-and-management-best-practices-for-safe-and-cost-efficient-truck-haulage
[5] “Haul roads – the heart of every quarry operation – Aggregates Business.” Accessed: Jan. 15, 2026. [Online]. Available: https://www.aggbusiness.com/haul-roads-heart-every-quarry-operation/
[6] M. Shoko, “Haul roads – the heart of every quarry operation,” Aggregates Business. Accessed: Jan. 15, 2026. [Online]. Available: https://www.aggbusiness.com/haul-roads-heart-every-quarry-operation/
[7] “Reliabilityweb Mining Haul Road Maintenance.” Accessed: Jan. 15, 2026. [Online]. Available: https://reliabilityweb.com/articles/entry/Mining_Haul_Road_Maintenance
[8] “8 Tips for Haul Road Maintenance in South Africa – KH Plant.” Accessed: Jan. 15, 2026. [Online]. Available: https://www.khplant.co.za/blog/8-tips-for-haul-road-maintenance-in-south-africa/
