Sample Layouts in AGTTM: How to Use Them (Properly) in Your TMP

Introduction

Sample layouts in AGTTM Part 9 are among the most referenced and most misused tools in temporary traffic planning.

They’re often viewed as pre-approved designs. But that’s not what they are.

AGTTM makes it clear: sample layouts are examples, not defaults.

What Are Sample Layouts?

AGTTM Part 9 provides visual examples of Traffic Guidance Schemes (TGSs) for:

• Static worksites

• Mobile works

• Short-term low-impact works

• Roundabouts

• Staging and contraflow

They show good practice. They do not cover all site conditions.

Reference: AGTTM09-21, Section 2.1 and 3.0

What They’re Good For

Sample layouts help:

• Communicate design intent to the crew

• Reduce planning time for simple jobs

• Benchmark devices, spacing, and sign placement

• Explain TTM concepts to clients or stakeholders

They’re a starting point — not the end.

When You Shouldn’t Use Them

You should not apply a sample layout if:

• Your site risk is higher than shown

• Road geometry doesn’t match (e.g. crest, curve, gradient)

• Speed zone or traffic volume differs significantly

• You need risk treatments not shown in the layout

If your TMP just pastes a sample layout with no changes or site-specific risk, it’s likely non-compliant.

How to Use Them Properly

1. Start with site risk (from AGTTM10 or Part 2)

2. Select a layout that roughly matches

3. Adapt it using spacing tables, site inspection, and TGS design principles

4. Document your changes in the TMP

5. Include site-specific hazards and controls in your risk register

Reference: AGTTM02-21, Section 3.4; AGTTM09-21, Section 2.2

Real-World Tip

Many clients and project managers will ask: “Just use the sample layout.”

You can — if you adapt it, justify it, and embed it in a proper TMP.

Never use a sample layout without:

• Risk assessment

• TGS title block and customisation

• Updated sign spacings and speed checks

What Auditors and Road Authorities Expect

• A clear link between the sample layout and site risk

• Evidence of adaptation (not cut-and-paste)

• TMP documents that match what’s installed on-site

If your worksite doesn’t match the drawing — you’re exposed.

Final Word

AGTTM sample layouts are great tools when used as intended: examples to inspire sound, site-specific design.

They’re not an excuse to skip the thinking. They’re an invitation to start it.

Use them wisely, adjust them boldly, and always pair them with real-world risk control.