A quarry speed limit is only a control if you can explain how you arrived at it. The number on the sign at the gate is the most visible safety decision on a quarry and, on most sites, the least documented. This guide covers how to set defensible limits, what signage and delineation a Western Australian quarry needs, and why both fail in practice.
Speed management sits inside the Code of practice: Road and traffic management at Western Australian mines, published 4 August 2026, and inside your traffic management plan under the Work Health and Safety (Mines) Regulations 2022.
Setting a speed limit you can justify
There is no prescribed quarry speed limit in WA. That is a feature, not a gap: the right limit depends on your roads, your vehicles and your traffic. What the regulator expects is a limit derived from something, and the something is usually a combination of:
- Stopping distance versus sight distance. If a loaded truck cannot stop within the distance the driver can see, the limit is too high, full stop.
- Road geometry. Curve radius, superelevation, grade, and whether the road is one lane or two.
- Surface condition and weather. A limit set for a dry, graded surface is wrong the day it rains.
- What is beside the road. Drop-offs, pedestrians, parked plant, stockpiles, infrastructure.
- Vehicle capability. Braking, retarder performance and stability differ enormously across a mixed quarry fleet.
Write the reasoning down. A single page in the traffic management plan showing how each zone limit was derived is worth more in an investigation than the sign itself.
Zoning rather than one site limit
A single site-wide limit is simple and almost always wrong somewhere. It is too fast around the weighbridge and too slow on the main haul, which teaches people that the number is arbitrary. Once a limit is treated as arbitrary, every limit on site loses authority.
Typical quarry zones worth separating: site entry and public road interface, weighbridge and office precinct, main haul route, ramps, working faces and loading areas, the workshop and fuel apron, and any single-lane section. Different limits, each with a reason.
Conditional speed reduction
Fixed limits assume fixed conditions. Rain, dust, smoke, glare at dawn and dusk, and darkness all change stopping and sight distance. The cleanest way to handle it is a trigger action response plan: a defined trigger, a defined speed or access change, and a named person who makes the call.
For example: visibility reduced below a stated distance triggers a reduced limit and mandatory headlights; heavy rain triggers a ramp closure until inspected. The structure is set out in building a TARP for mine roads. Without a mechanism like this, the practical control becomes each driver’s judgement, which is exactly what you were trying to avoid.
Signage that works
Quarry signage fails in predictable ways.
- Too many signs. A gate cluttered with fifteen signs communicates nothing. Prioritise ruthlessly.
- Signs that contradict the plan. A 40 sign on a road the plan says is 25. That single inconsistency undermines the whole document.
- Faded, rotated or buried signs. Dust, sun and a knock from a grader. If nobody owns sign condition, nobody checks it.
- Signs positioned after the decision point. A give way sign at the intersection rather than on the approach gives a loaded truck no chance.
- No sign where the rule changes. Zone boundaries need marking, or the zones exist only on paper.
Keep signage consistent with what drivers know from public roads. Give way, stop, speed and hazard warning conventions transfer directly, and using them means a customer truck driver reads your site correctly on their first visit.
Delineation and lighting
Delineation tells a driver where the road is when the surface does not. On a quarry that means edge markers on ramps and near drop-offs, reflective delineation on any road used at night, and clear marking of pedestrian areas and parking. Windrows do part of this job, but a windrow that blends into the pit wall at night is not delineation.
If any part of the operation runs after dark, lighting needs to match the task. Fixed lighting for the weighbridge, crusher and workshop. Mobile lighting for active faces. Check it from the driver’s seat, not from the ground: glare from a poorly aimed light plant is its own hazard.
Enforcement without theatre
A limit nobody checks is a suggestion. Options at quarry scale range from supervisor observation and in-vehicle monitoring through to GPS telematics on the fleet. What matters is not the technology but that non-compliance is seen, recorded and acted on consistently.
Consistency is the hard part. If speeding by a contractor is handled differently from speeding by a long-serving operator, you have taught the site that the rule is negotiable.
Making zones visible
Speed zones, exclusion zones and temporary restrictions all share a problem: they are boundaries in space that people need to know about before they reach them. Signage handles the permanent ones. Temporary changes, a ramp under repair, a closed section, a reduced limit after rain, move faster than signage does.
Showing them on a live site map that operators can see on a phone closes that gap and gives you the record of when the restriction went on and came off. See why visual maps outperform text-based systems, or book a demo.
Speed and signage sit inside the quarry traffic management plan, alongside segregation and road design.
Related guides
- Quarry Safety in Western Australia: A Compliance Guide for Quarry Managers
- WA’s Road and Traffic Management Code for Mines: What It Requires
- The Quarry Manager in WA: Duties, Appointment and When One Is Required
- How to Get a WA Quarry Manager’s Certificate of Competency
- All WA Quarries & Mines guides
Frequently asked questions
Is there a legal speed limit for WA quarries?
No prescribed figure. The duty is to manage the risk so far as is reasonably practicable, which means setting limits appropriate to your roads, vehicles and conditions, and being able to explain how you set them.
Do public road signage standards apply inside a quarry?
Australian Standard road signage rules govern public roads, not the inside of a mining lease. Using the same conventions is still good practice because drivers already understand them, and consistency reduces error for visiting drivers.
Should speed limits change in wet weather?
Yes, if wet conditions change stopping distance or road stability on your site, which they usually do. Set the trigger and the response in advance rather than leaving it to individual judgement in the moment.
Who is responsible for maintaining signs?
Name someone in the traffic management plan. Unowned sign maintenance is the reason most quarries have at least one faded, rotated or contradictory sign in service right now.