Install MMS at advance, at the decision point, and as downstream confirmation; keep compliant offsets, heights and stable supports.
Install Multi Message Signs in three places: before the hazard (advance warning), at the decision point (merge/turn/detour), and immediately after as confirmation. Space panels by 2–4 seconds of travel time and mount to the heights/offsets required by Austroads/AS 1742.3 so they’re visible, stable and out of conflict zones. This guide shows how to apply those rules on Australian worksites, events, private roads and near-road environments.
Quick placement checklist
- Map the approach: advance warning, decision point, confirmation.
- Test sight lines from driver and pedestrian eye heights.
- Choose mounting suited to wind and ground conditions.
- Keep paths, ramps and driveways unobstructed.
- Sequence messages; do not stack competing instructions.
- Weight, secure and verify stability.
- Record the layout for inspection and reinstallation if moved.
When to seek approvals or specialist input
On or near public roads, permits and a formal traffic management plan may be required. Major works, complex traffic environments and high-speed roads benefit from specialist design and review.
- Contact the relevant road authority or council before placing near carriageways.
- Use qualified practitioners for complex or high-risk setups.
- Retain documentation of approvals and as-installed layouts.
Technical sources and further reading
- Austroads Guide to Temporary Traffic Management (GTTM) – national guidance on approach spacing, device placement and worker safety.
- AS 1742.3:2019 – Traffic control for works on roads – Australian Standard covering temporary traffic control devices and mounting practices.
- Queensland MUTCD – state supplement with detailed layouts and distances for works on roads.
- Transport for NSW – Traffic Control at Work Sites – NSW resources and updates for TTM practitioners.
Related Sign Portal resources: Multi Message - Keep Out All Visitors Must Report Sign · Multi Message - Forklifts In Use Keep Clear Sign · Multi Message - High Noise Area Hearing Protection Sign
Frequently Asked Questions
What is a multi message sign system?
It is a portable frame that accepts interchangeable panels so you can swap messages as site conditions change without replacing the whole sign.
How far before a hazard should I place the first panel?
It depends on speed, sight distance and complexity. Use an advance warning, then an instruction at the decision point, and a confirmation after. Check local requirements for exact distances.
Do I need reflective panels for night works?
If signs are viewed in low light or by drivers at night, reflective or illuminated treatments are recommended to improve conspicuity.
Can I mount panels on fences or hoarding?
Yes, if the fixings are secure, edges do not protrude into walkways and visibility is maintained. Avoid creating trip hazards or blocking accessible paths.
How do I stop frames blowing over in wind?
Use suitable weighting, orient to reduce wind load, place behind barriers where possible and inspect regularly for movement.
What insert size do you make?
We manufacture to your frame’s insert size and can produce custom sets. Provide frame measurements or a sample panel for best results.
Do I need approval to place signs near a road?
Often yes. Public-road or kerbside placement may require council or road authority approval and a traffic management plan.
Keep learning
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