Appraisal and modelling tools
A number of tools are available to assist those undertaking appraisal and modelling, including:
- software and a number of data sources such as the Trip-end Modelling Programme (TEMpro) which forecasts travel demand at detailed geographical level
- a collection of advice and guidance on modelling and appraisal (known as WebTAG) for those developing transport projects
- a National Transport Model which has been developed as an analytical and policy testing tool, to provide a systematic means of comparing the national consequences of applied transport polices
- a programme of research work on modelling, appraisal and evaluation which aims to improve our advice on transport modelling and economic appraisal
Software and data
The Department for Transport produce and support software for assessing whether road schemes provide value for money, publications providing guidance on how to predict the traffic impacts of road schemes, and traffic growth forecasts.
- COBA (COst Benefit Analysis) and QUADRO4 (QUeues And Delays at ROadworks)
- DIADEM (Dynamic Integrated Assignment and DEmand Modelling)
- INCA (INcident Cost-benefit Assessment)
- TEMpro (Trip End Model program)
- TUBA (Transport Users Benefit Appraisal)
The National Transport Model
The National Transport Model (NTM) provides a systematic means of comparing the national consequences of alternative national transport policies or widely-applied local transport policies, against a range of background scenarios which take into account the major factors affecting future patterns of travel.
Research and development of guidance
The Department has a programme of research work on modelling, appraisal and evaluation. The aim of this work is to support the continuing development of the New Approach To Appraisal by improving our advice on transport modelling and economic appraisal.