Short-Term Low-Impact Worksites: Clarifying Use Under AGTTM

Introduction

Short-Term Low-Impact (STLI) worksites are among the most misused classifications in Temporary Traffic Management (TTM). Introduced to streamline simple, low-risk jobs, they are often wrongly applied to high-risk or unsuitable scenarios.

AGTTM Part 5 provides clear guidance – but only if you read it in context.

What Is a STLI Worksite?

STLI worksites are temporary activities with short durations and minimal impact on traffic flow or road user safety. They are characterised by:

• Minimal setup/removal times

• No excavation or significant disruption

• Low exposure to live traffic

Reference: AGTTM05-21, Section 1.3 and 2.2

When Can You Use STLI?

A worksite may qualify if it meets all of the following:

1. Duration: Typically < 1 hour

2. Work type: Inspection, surveying, litter pickup, or similar

3. Location: Off-road, shoulder, or behind safety barrier (not in live lanes)

4. Risk: Low, as per site-specific assessment

Note: It’s not just about how long the job takes — it’s about how risky it is.

Reference: AGTTM05-21, Clause 2.2.2 and 3.1

Examples of STLI

• Walking inspections on footpaths

• Graffiti removal in median (with physical protection)

• Stormwater grate cleaning from the verge

Common Misuse Scenarios

• Line marking in live lanes without controls

• Night works labelled as STLI but occurring in high-speed areas

• Multiple short jobs chained together under one STLI TMP

These do not meet the intent of AGTTM and may breach WHS or road authority conditions.

How to Design for STLI Correctly

Use STLI layouts only when:

• The work fits the defined criteria

• Devices are minimal but appropriate

• Workers are protected through physical or procedural controls

Example controls:

• Vehicle-mounted warning devices

• Lookout protection (with suitable sight distance)

• Time-of-day restrictions (e.g. off-peak only)

Reference: AGTTM05-21, Sections 3.2 to 4.3

Documentation Still Matters

Even STLI works require:

• A documented TMP

• Site-specific risk assessment

• Closure process (e.g. removal of devices, completion record)

Reference: AGTTM05-21, Section 5.1.6

Real-World Tip

If a road authority asks, "Why did you use STLI for this site?" — you must be able to defend your decision with a documented risk assessment and AGTTM references.

Final Word

Short-term doesn’t mean low-risk. And "low-impact" must be proven, not assumed.

When used properly, STLI can reduce cost and disruption. When used wrongly, it puts lives at risk and projects in jeopardy.

Start with the risk. Justify the method. And remember: STLI is the exception, not the default.