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Capacity assessments are normally an integral part of a Transport Assessment but can be requested by the Highway Authority where they deem the impact of a development proposal on a junction to be material.

The industry standard computer software used for the junction modelling will vary according to the type of junction.


As a guide the following software packages are generally used;

  • Junctions 9 PICADY Module (TRL) for major/minor priority junctions

  • Junctions 9 ARCADY Module (TRL) for mini and larger non signalised roundabouts

  • LINSIG (JCT) for signalised junctions

  • LINSIG (JCT) or TRANSYT (TRL) for linked signalised junctions and small networks

Transport Planning
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