Accurate Junction Modelling for Confident Design and Approval

Data-driven analysis using industry-standard software to support safe and efficient junction design.

At Grange Transport Consulting, we provide detailed Junction Modelling to assess how traffic moves through existing and proposed layouts.


Our modelling supports Transport Assessments, Road Safety Audits, and highway designs by identifying capacity issues, testing mitigation options, and demonstrating alignment with national and local highway standards.

What Is Junction Modelling?

Junction Modelling is the process of analysing how traffic flows through a junction or access point to predict performance under different scenarios.


It is often required by planning authorities or highway engineers to understand whether a proposed development or improvement scheme will operate safely and efficiently.



Our work helps determine:

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Current and future junction performance

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Queue lengths and delays at peak times

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Safety and capacity under design changes

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The impact of development-generated traffic

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The effectiveness of mitigation measures

By modelling these outcomes accurately, we provide clear evidence that supports design decisions and planning applications.

Development-Generated Traffic

Queue Lengths

Our Approach

We use industry-standard tools such as PICADY, ARCADY, and LinSig to simulate the operation of priority, roundabout, and signal-controlled junctions.


Each model is built from real data and validated against site conditions to ensure reliability.

Our team combines technical skill with planning experience to ensure that results are clearly explained and suitable for submission to planning and highway authorities.


We work closely with clients to identify practical solutions that improve capacity, maintain safety, and meet policy objectives.

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Grange Transport Consulting has been consulting for us for a number of years. We have found Wing to be extremely reliable and would highly recommend.

Types of Junctions We Model

Each plan or pack is customised to the project and may include:

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Roundabouts (mini, standard, and multi-lane) using ARCADY

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Priority junctions and accesses using PICADY

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Signalised junctions and networks using LinSig

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Ghost island and right-turn lanes

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Complex and multi-junction systems

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Development site accesses and internal layouts

Whether you need a single access model or a network-wide study, our team can provide proportionate, clear results to support your design and planning case.

Our Process

1

Scope and Data Review

We review your site drawings and confirm modelling requirements.

2

Traffic Data Collection

Survey and forecast data integrated into the model.

3

Model Development

Build and calibrate using PICADY, ARCADY, or LinSig.

4

Testing and Analysis

Assess current, future, and mitigation scenarios.

5

Reporting and Recommendations

Clear outputs and conclusions ready for planning submission.

We provide all outputs, including model files and input sheets, along with a clear technical report suitable for submission to the local authority or National Highways.

Why Choose Grange Transport Consulting

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Over 30 years of combined experience in traffic engineering and transport planning

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Fully independent and accredited consultants

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Use of recognised industry software (PICADY, ARCADY, LinSig)

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Transparent fixed-fee pricing

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Clear, easy-to-read reporting

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Reliable turnaround times to meet planning deadlines

We combine detailed technical modelling with clear communication and practical recommendations that keep projects moving forward.

Related Services

Junction Modelling often supports or is supported by:

Transport Assessments

Swept Path Analysis

Road Safety Audits

Mitigation Design

Get Reliable Junction Modelling and Clear Results

Our team can review your drawings, advise on the appropriate modelling approach, and provide a fixed-fee quotation.


We deliver accurate models and reports that help you make confident design and planning decisions.

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