A haul road berm is a mound of rock or earth built along the edge of a mine haul road or ramp to guide vehicles and warn operators of dangerous drop-offs.
A haul road berm is a pile or mound of material, usually rock or earth, placed along the edge of a haul road, ramp or elevated roadway to guide vehicles and warn operators of a drop-off.
Berms are one of the most visible safety features at surface mines, quarries and sand and gravel pits. Haul trucks, loaders and service vehicles travel the same roads every shift, often on grades and in dust, rain or darkness. A properly built berm marks the road edge, gives the operator a clear visual cue and can redirect a vehicle that drifts toward the bank. Without one, a small steering error or a soft shoulder can turn into a rollover down a highwall or over a dump edge.
Berms matter to haul truck drivers, equipment operators, supervisors, road maintenance crews and anyone who examines the work area. They are covered by federal mining standards enforced by the Mine Safety and Health Administration (MSHA). Berms work alongside cab protection such as a rollover protective structure (ROPS), but the goal of a berm is to keep the vehicle on the road in the first place.
Under 30 CFR 56.9300(a), berms or guardrails must be provided and maintained on the banks of roadways where a drop-off exists of sufficient grade or depth to cause a vehicle to overturn or endanger persons in equipment. Under 30 CFR 56.9300(b), berms or guardrails must be at least mid-axle height of the largest self-propelled mobile equipment that usually travels the roadway. The same requirements apply to underground metal and nonmetal mines under 30 CFR 57.9300.
For dumping locations, 30 CFR 56.9301 requires berms, bumper blocks, safety hooks or similar impeding devices where there is a danger of overtravel or overturning.
At surface coal mines, 30 CFR 77.1605(k) requires berms or guards on the outer bank of elevated roadways.
MSHA's safety program rule for surface mobile equipment, found at 30 CFR 56.23000 and the sections that follow, required compliance starting July 17, 2024. It requires mine operators to have written programs that address the hazards of surface mobile equipment. Road edges, berm condition and dump points fit naturally into that program, along with technology such as proximity warning systems.
A limestone quarry upgraded its fleet to larger haul trucks but kept the berms that had been built for the old trucks. During a night shift, a driver drifted wide on a curve near the top of the ramp. The front tire rode up the berm, which was well below the new truck's mid-axle height, and the truck stopped with one wheel hanging over the bank. No one was hurt, but the near miss could easily have been a fatal rollover.
The quarry measured the mid-axle height of every truck in the fleet and rebuilt the berms on all roads used by the new trucks. It added berm height checks to shift examinations, set a rule that graders must restore any berm they disturb and marked curves with reflectors for night visibility. Supervisors now review open berm repairs each week as a leading indicator, using a mobile checklist in SafetyIQ's safety audit software to track each defect until it is closed.
At metal and nonmetal mines, MSHA requires berms or guardrails to be at least mid-axle height of the largest self-propelled mobile equipment that usually travels the roadway. Many operators build higher than the minimum to allow for erosion and settling.
No. A berm is a guide and a visual warning, not a crash barrier. A fully loaded truck at speed can climb over or push through a berm, so mines rely on brake maintenance, speed control and runaway truck ramps for that hazard.
MSHA requires berms or guardrails where a drop-off is steep or deep enough to cause a vehicle to overturn or endanger people in equipment. Dump points with a danger of overtravel or overturning also need berms, bumper blocks or similar devices.
Some openings may be needed for water to drain, but each gap is a place where a vehicle can leave the road. Keep gaps few and narrow, avoid them on curves and grades, and consider culverts or other drainage designs that keep the berm continuous.
Part of SafetyIQ's EHS glossary: plain-English definitions of workplace health and safety terms.
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