Third Party Model Access Protocol
All enquiries for agreement on the use of and access to the GCC models and to arrange a pre-application discussion with GCC highways officers, should be made directly through GCC Highway Development Management ‘Planning and Development’ team, initially via the following email address: devcoord@gloucestershire.gov.uk
Gloucestershire County Council (GCC) in partnership with National Highways (formerly Highways England), as Highway Authorities within Gloucestershire, have developed a suite of highway assignment models. The choice of traffic models currently available comprise the following:
- Gloucestershire Countywide Multi-Modal Model (GC3M)
- Gloucestershire Countywide Traffic Model (GCTM)
- A46 / Tewkesbury Paramics - Discovery microsimulation Model
The suite of highways traffic models can be / have been used to.
- Assess the impacts of individual planning applications.
- Assist in the development of Local Plans and emerging land use allocations.
- Inform the development of GCC’s Local Transport Plan and Capital programme.
- Assist in the assessment and appraisal of potential major scheme submissions.
Details of how to access Gloucestershire’s suite of highways traffic models, as well as information on the associated Model Access charges, are provided in the Third Party Model Access Protocol, updated in June 2025. The protocol protects our intellectual property rights by way of an agreement to be signed by all parties.
Gloucestershire County Council can also provide a technical advice note on request, which provides guidance on tools that are available to support assessment of transport decarbonisation measures.