Haul Road Crossings: Traffic Management at Quarry and Mine Interfaces

Haul road crossing traffic management deals with the point where quarry or mine traffic meets the public road. The operator controls the site under its own safety system and, in many states, mining safety laws, while the road authority controls the public road. Crossings work when both are planned together, with clear priority and a reliable call-up system.

Most traffic controllers will never work inside an open-cut mine, but plenty will work at a quarry entrance, a temporary haul route for a road project or a crossing where large trucks move between pits and processing plants. These interfaces mix heavy, slow-to-stop vehicles with ordinary drivers who have no idea what a laden haul truck can and cannot do. This guide explains how to plan them.

This is general information, not legal or safety advice. Mine and quarry sites have their own legislation, regulators and operator procedures, which take precedence on site.

Two rule sets at one intersection

A mine or quarry is a workplace with its own safety management system. In several states, mines and quarries come under specific mining safety legislation with a dedicated regulator, such as the NSW Resources Regulator or Resources Safety and Health Queensland. In NSW, mine operators must manage the principal hazard of roads and other vehicle operating areas through a documented management plan. Where and how quarries are covered differs between states, so check which laws apply to the site.

The public road outside the gate belongs to a road authority: a council or the state road agency. Any change to that road, from a temporary crossing to a lane closure for the entrance, needs the road authority's approval and is governed by the general work health and safety laws and the temporary traffic management framework.

The interface document is the piece most often missing. It should state who stops whom, how communication works, what happens when equipment fails and who has authority to stop the crossing.

Types of quarry and mine interfaces

Not every interface is a crossing, and the controls differ.

Permanent crossings are engineered with signals or grade separation and approved for the long term. Temporary crossings, such as for a road project borrow pit or a short campaign, are where traffic control companies are usually involved, and where most of the planning risk sits.

Why haul trucks change the risk

Off-highway haul trucks are large, slow to stop and have big blind spots, particularly close to the front and the left side. A laden truck on a downgrade approaching a crossing may need a long distance to stop, and stopping on a grade can be undesirable or unsafe. Public road drivers do not expect any of this. Some will try to beat the truck across; others will stop in the wrong place to watch.

Several other factors add to the risk:

• Different rules on site. Mine light vehicles often need flags, beacons and radio call-ups before entering haul roads. Public cars have none of that.
• Dust and visibility. Haul roads generate dust that can drift across the public road and reduce sight distance.
• Mud and spillage. Material tracked onto the road reduces skid resistance, especially when wet. Wheel washes, rumble grids and sweeping need to be in the plan.
• Round-the-clock operation. Many sites run day and night shifts, so the crossing operates in darkness and at shift changes when traffic peaks.

That is why priority at a crossing must be absolute. Either public traffic stops for haul trucks under positive control, or haul trucks stop for public traffic. A crossing that relies on drivers working it out between themselves is not controlled.

Designing a temporary crossing

A temporary crossing needs the same rigour as any high-risk traffic arrangement, and usually more.

Approvals and design

The road authority approves the crossing and its conditions. In Queensland, works on state-controlled roads involve a road corridor permit; our guide to the QLD road corridor and traffic control permits explains the difference. In NSW, state roads need a road occupancy licence; see our road occupancy licence guide. The TGS must be prepared by a suitably qualified person and reflect the actual truck types, speeds and volumes.

Sight distance and warning

Approaching public drivers need to see the crossing control in time to stop. Check stopping distances at the approach speed, especially over crests and around curves, with the stopping sight distance calculator. Advance warning signs, temporary speed reductions where approved, and, on high-speed rural roads, end-of-queue protection all help. In NSW, TS 05492 added requirements on end-of-queue management and temporary speed zoning, so check what the current standard requires for your road.

The call-up system

The crossing works only if the haul drivers and the traffic controllers share one communication system. Typical arrangements include:

1. Haul drivers call the crossing on an agreed radio channel at a set point before arrival.
2. The controller confirms when public traffic has been stopped and the crossing is clear.
3. The haul driver crosses only on that confirmation.
4. The controller releases public traffic once the truck is clear.

Agree channels, call signs and phrases with the operator, and test them before the first truck. Our guide to traffic control radio communication covers procedure and phrasing. If radio fails, the crossing stops until communication is restored.

Holding positions

Agree where haul trucks wait when the crossing is not available. That position should be on flat ground, with the truck visible to the controller and not blocking site traffic. Never plan a crossing that requires a loaded truck to stop on a steep downgrade.

Working at the interface: inductions and site rules

Traffic controllers at a mine or quarry interface usually need the operator's site induction, and sometimes additional site-specific training. Expect requirements such as:

• fitness-for-work testing, including drug and alcohol testing;
• site-specific PPE;
• vehicle requirements for any vehicle entering the site;
• radio protocols on the site channel; and
• reporting of incidents and near misses through both the traffic company and the site system.

Arrange inductions before the first shift. A crew turned away at the gate because nobody booked inductions is a common, expensive start.

Blasting near public roads

Where blasting could affect a public road, the operator's blast arrangements may require short road closures. Guards or traffic controllers hold traffic at agreed positions and follow the blast supervisor's instructions, including the all-clear. The closure needs approval and a TGS, and controllers must understand exactly where they stand and who releases the road.

Common mistakes at mine and quarry interfaces

• Assuming the site rules stop at the fence. The operator's vehicle interaction controls and the road TGS have to meet in the middle, or nobody owns the crossing itself.
• Priority left to judgement. "Trucks give way when it is busy" is not a control. Write down who stops, where and on whose signal.
• Radio channels that do not match. The traffic crew on one channel and haul drivers on another, relayed through a supervisor who is often elsewhere.
• Shift changes overlooked. New haul drivers start without the crossing briefing, or the traffic crew changes over while trucks are still running.
• Wet weather not planned for. Rain turns tracked material into a slick film on the public road, and stopping distances grow for everyone.
• Approval conditions not on site. Controllers cannot apply conditions on hours, speed or truck numbers that they have never seen.

Interface planning checklist

Rural crossings often sit on high-speed roads with heavy vehicles already in the traffic mix. Our guide to rural road works traffic control covers long-distance warnings and fatigue on remote jobs.

Next steps

Before quoting or staffing a haul road crossing, meet the operator and the road authority together, settle the interface arrangement and confirm current requirements with your state regulator, Safe Work Australia guidance and the road authority, such as Transport and Main Roads in Queensland. For crews working these sites, TrafWise keeps inductions, SWMS sign-off and shift records together, so you can show who was briefed on the call-up procedure and when.