AS 1742 Traffic & Road Signs — Australian Compliance Guide
AS 1742 — Manual of Uniform Traffic Control Devices — is the Australian Standard series that governs every road and traffic sign used on public roads and most private roads in Australia. It's a multi-part Standard (parts 1 through 14+) covering regulatory signs, warning signs, guide signs, speed limits, parking, school zones, work zones, and more. Every state road authority references it. STOP, GIVE WAY, NO ENTRY, speed limits, parking restrictions, and work-zone signage all fall under AS 1742.
The critical thing to understand as a buyer: AS 1742 is stricter than AS 1319. Where AS 1319 workplace signs allow flexibility on material, AS 1742 road signs require 1.6mm aluminium substrate and Class 1 or Class 2 retroreflective sheeting (per AS/NZS 1906.1) for almost every regulatory sign. You cannot substitute corflute or polypropylene on a road sign and remain compliant.
This guide covers what's regulated, when Class 1 vs Class 2 reflective applies, what sizes the road authorities specify, and which Platinum Signs categories map to AS 1742 compliance.
Which signs are regulated under AS 1742?
AS 1742 is structured by sign family. The parts most relevant to sign buyers are:
| AS 1742 Part | Covers | Example signs |
|---|---|---|
| Part 2 | Traffic control devices for general use | STOP (R1-1), GIVE WAY (R1-2), NO ENTRY (R2-4) |
| Part 3 | Traffic control devices for work on roads | ROAD WORK AHEAD, PREPARE TO STOP, DETOUR |
| Part 4 | Speed controls | Speed limit signs (R4-1), school zones, shared zones |
| Part 10 | Pedestrian control and protection | PEDESTRIAN CROSSING, SCHOOL CROSSING |
| Part 11 | Parking controls | NO STOPPING (R5-400), NO PARKING (R5-40), P-plate restrictions |
| Part 13 | Local area traffic management | LATM treatments, shared zones, traffic calming |
Material requirements — aluminium, always
Every regulatory sign under AS 1742 must be manufactured on 1.6mm aluminium substrate. Not 1.2mm, not 2mm, not ACM, not colorbond. The 1.6mm specification is set by AS 1742.14 and is consistent across all state road authority technical specifications. The reason is performance: 1.6mm aluminium is the thinnest substrate that survives decades of UV, wind-loading, and vehicle impact without deformation, while being thin enough to be cost-effective at the enormous volumes road authorities buy.
Retroreflective sheeting is applied over the aluminium — Class 1 for high-visibility high-speed signs (most regulatory signs, stop signs, give way, speed limits on arterial roads) and Class 2 for lower-speed zones, urban streets, and some work-zone applications. Class 400 is a newer diamond-grade sheeting used on Do Not Overtake Turning Vehicle (DNOTV) plates and some mandatory applications.
| Reflective class | Typical application | Standard |
|---|---|---|
| Class 1 | STOP, GIVE WAY, NO ENTRY, arterial roads, highways, high-speed regulatory | AS/NZS 1906.1 |
| Class 2 | Urban streets, school zones, work zones, lower-speed regulatory | AS/NZS 1906.1 |
| Class 400 | DNOTV rear marker plates (NSW mandatory from Sept 2025) | AS/NZS 1906.1 / AS 4001 |
| Non-reflective | Private car parks, private estates, non-regulatory wayfinding only | — |
Browse category
Traffic & Road Signs
AS 1742-compliant regulatory traffic signs — STOP, GIVE WAY, NO ENTRY, speed limits, parking. Manufactured on 1.6mm aluminium with Class 1 or Class 2 reflective sheeting per AS/NZS 1906.1.
Browse category
Parking Signs
Parking restriction signs to AS 1742 Part 11 — NO STOPPING, NO PARKING, disabled parking, time-restricted parking. Standard sizes for on-street and private car park applications.
Browse category
Speed Limit Signs
Speed limit signs (R4-1 family) to AS 1742 Part 4 — 5km/h to 110km/h in standard and reflective-class options. School zone and shared zone variants available.
Standard sizes under AS 1742
AS 1742 sizes are prescribed by sign type, not by viewing distance alone. The common sizes buyers encounter are:
| Sign | Standard size (mm) | Larger variant (mm) | Use case |
|---|---|---|---|
| STOP (R1-1) | 600 × 600 octagon | 750 × 750 octagon | Larger on arterials/highways |
| GIVE WAY (R1-2) | 750 triangle | 900 triangle | Larger on higher-speed roads |
| NO ENTRY (R2-4) | 600 round | 750 round | High-speed variants |
| Speed limit (R4-1) | 600 × 750 | 750 × 900 | Highway variant |
| NO STOPPING (R5-400) | 225 × 450 | 300 × 600 | Standard vs high-visibility |
| Parking (R5-x) | 225 × 300 | 300 × 450 | Indoor vs outdoor kerbside |
Work-zone and temporary signs
AS 1742.3 covers traffic control devices for work zones — the orange fluorescent signs you see around road works. These have their own colour system (fluorescent orange background, black legend) and sizing rules. The critical difference from AS 1319 is that work-zone signs are regulated under AS 1742.3 and must be aluminium + Class 1 reflective, even though they're temporary. Corflute 'ROAD WORK' signs sold by some general retailers are not AS 1742.3 compliant and will fail a Traffic Management Plan audit.
Who enforces AS 1742?
- Transport for NSW — on NSW roads, via the NSW Centre for Road Safety and Traffic Control Devices technical specifications
- Department of Transport and Planning Victoria — on Victorian roads
- Department of Transport and Main Roads Queensland
- Department of Transport WA
- Department for Infrastructure and Transport SA
- Each local government on local roads
- Private road owners (car park operators, shopping centres) enforce it contractually via Traffic Impact Assessments and Development Approvals
Common AS 1742 compliance failures
- Non-aluminium substrate — corflute or colorbond regulatory signs will fail immediately on any audited job
- Wrong reflective class — using Class 2 sheeting on an arterial road where Class 1 is required
- Non-standard size — a 450mm STOP sign (workplace size) used where a 600mm STOP sign is required
- Expired reflective sheeting — AS/NZS 1906.1 sheeting has a rated lifespan (7–10 years for most classes). Faded signs must be replaced
- Missing mounting hardware — pole-mount brackets must be rated for the sign and wind-load class of the road
How Platinum Signs manufactures to AS 1742
Our regulatory traffic signs are manufactured on 1.6mm aluminium substrate with Class 1 or Class 2 AS/NZS 1906.1 reflective sheeting, at the sizes specified in each AS 1742 part. We do not substitute materials. For high-visibility applications — school zones, arterial-road work zones, DNOTV rear marker plates — we use Class 400 diamond-grade sheeting. Every regulatory sign we sell through the shop is buildable to the AS 1742 spec at standard sizes, with larger variants available as custom print-on-demand with 5–10 day lead time depending on sheet supply.
Written by
Platinum Signs
Sydney-based commercial signage manufacturer
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