Transport modelling

7. Checking the transport model is fit for purpose

As part of the development process, we assess our transport models to make sure they are fit for purpose. The results of this assessment provide us with two main reports. 


Local Model Validation Report (LMVR)

The LMVR shows how we have created the transport model for the purposes of appraising the impacts of transport schemes. The report highlights the data used to develop the model in line with the latest government and scheme appraisal guidance.


Forecast report

The forecast report provides assessment of likely impacts at a future point in time, such as:

  • travel journey patterns
  • costs of travel
  • proposal-specific impacts on traffic flows
  • journey times between the two time periods i.e. current (base) and future years

This requires the development of a base year and a future year to compare the changes as a result of the development of the scheme(s). The base year is generally the current year of model development, and the future year generally after the building of the scheme.

To be in a position to make the case for national funding, there is a need to provide detailed evidence on travel demand. This complements government guidance e.g. Department for Transport (DfT) Transport Analysis Guidance (TAG) and Design Manual for Roads and Bridges (DMRB).




Aylesbury Local Model Validation Report PDF, 11.6MB
Aylesbury Sign Off Report PDF, 159KB
Aylesbury Forecasting Report PDF, 7.40MB


Countywide Local Model Validation Report PDF, 7.8MB

High Wycombe

High Wycombe Highways Assignment Model PDF, 2.03MB


Iver Sign Off Report PDF, 168KB
Iver Local Model Validation Report PDF, 23.5MB
Iver Forecasting Report PDF, 4.47MB

Princes Risborough

Princes Risborough Town Plan Traffic Modelling PDF, 3.57MB



Some of these documents may not be suitable for users of assistive technology. Request a copy in an accessible format by contacting


Print entire guide

Last updated: 16 March 2021

Was this page helpful?

Very poor
Neither good nor poor
Very good