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Solent Sub-Regional Transport Model (SRTM)

Introduction to the SRTM model

Solent Transport is the owner of the Solent Sub-Regional Transport Model (SRTM). 


The SRTM is a multi-modal transport model, covering highway and public transport modes, which allows testing of the impacts and benefits of land use and transport interventions. It also has capabilities to test the economic mpacts of these interventions.

SRTM is fully WebTAG-compliant and is capable of providing outputs which can robustly support the development of transport strategies and schemes, provide information to support development of funding bids and business cases, and can inform land use strategies and development transport assessments.

SRTM is operated by SYSTRA consultancy under contract to Solent Transport. Since its development in 2010, SRTM has been a key resource supporting securing several hundred million pounds of transport funding in the Solent and planning its delivery. SRTM has also informed numerous Local Plans, major development transport assessments and transport strategies and studies. The model was extensively updated in 2015 and can be used for modelling of transport and land use scenarios for years through to 2041.


 Model user guide and application form

A user guide, providing key information for potential users of the model and an application form for access to the model are provided below. 

Model User Guide

Application for use form


Additionally, GIS Shapefiles for the model's zone system and RTM network (for the 2041 year reference case) are available via the links below.

RTM Network- 2041 Model Year reference case

Zone system


For more information regarding the SRTM, including queries and support regarding access to and use of the model, please contact This email address is being protected from spambots. You need JavaScript enabled to view it.


Model development, validation & calibration

As the key transport evidence base for the Solent, the SRTM is supported by a number of technical reports. These provide background information on the development of the SRTM, including surveys and calibration and validation, to demonstrate that the SRTM is compliant with Government appraisal guidance. 

A model-wide validation and recalibration of the 2019 forecast year against recorded 2019 count data has been undertaken, effectively bringing the base year for the model forward from 2015 to 2019.   

Reports for the current (2019 recalibrated) version of SRTM can be accessed via the links below:


Reports for the 2015 base version of SRTM can be accessed via the links below:   


The reports below refer to the 2010 base year model. This version of the SRTM is now superseded by the 2015 base year model and the 2019 recalibrated version of the model (see above) although some of the content of these reports (eg report on surveys) is still relevant to the 2015 base model. 






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