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Please note: This site has been superseded and is no longer maintained. The content of this site was archived following the definite WebTAG release in January 2014. Users should use the restructured WebTAG guidance on GOV.UK.

Documents

Consultation documents

We would like you to get involved in the development of this guidance to analyse transport schemes.

Guidance reflects the findings of current research, experience from professionals working in the area in the UK and in other countries. Through the consultation period, the documents in this section are under review and so we would like to hear from you where the advice may be improved.

Each document is expected to stay in the consultation section at least until the dates indicated. Documents in this section may change from time to time to reflect comments. Where changes have occurred, this will be noted in this section and old versions will be made available on request.

Consultation documents are denoted by the suffix C in the TAG Unit number; eg Unit 3.5.6C.
Comments on WebTAG consultation documents listed below are welcome.

Email: tasm@dft.gsi.gov.uk
or posted to:
Transport Appraisal and Strategic Modelling (TASM) Division
Department for Transport
Zone 2/25, Great Minster House
33 Horseferry Road
London SW1P 4DR


February 2013

The following aspects have been updated within the units listed:

Air quality abatement costs – incorporates the application of a marginal abatement cost approach to changes in air quality in areas exceeding EU limit values. This change results from recommendations by Defra that will be published shortly in Supplementary Green Book guidance.

TAG Unit 3.3.3C: The Air Quality Sub-Objective
TAG Unit 3.3.3C: Pollution Concentration Entry
TAG Unit 3.3.3C: Air Quality Worksheet

Ecosystem services – incorporates a description on the links between the Environmental Capital Approach that is currently used to assess some environmental impacts in WebTAG and the Ecosystem Services Approach that is recommended by Defra in Supplementary Green Book guidance

TAG Unit 3.3.6C: The Environmental Capital Approach

Withdrawal of COBA, QUADRO and INCA – removes references to some software packages allowing for their licences to be withdrawn from sale.

TAG Unit 3.4.1C: The Accidents Sub-Objective
TAG Unit 3.5.7C: The Reliability Sub-Objective

Bus soft factors – formalises guidance on application of bus quality factors in transport modelling and appraisal

TAG Unit 3.11.2C: Road Traffic and Public Transport Assignment Modelling

Proportionate appraisal – updates the guidance on development of an Option Assessment Report and Appraisal Specification Report. The proposed revisions to this part of the guidance take account of experience of implementation and the views received from practitioners to earlier consultation. This update removes the option to use elasticity models for non-rail schemes at the full appraisal stage as this has been shown to not be robust.

TAG Unit 1.3C: Trunk Roads
TAG Unit 2.1.1C: The Steps in the Process - Overview
TAG Unit 2.1.2C: Option Development (Stage 1)
TAG Unit 2.1.3C: Further Appraisal (Stage 2)
TAG Unit 3.1.1C: Introduction to Modelling
TAG Unit 3.1.2C: Transport Models
TAG Unit 3.10.1C: Variable Demand Modelling – Preliminary Assessment Procedures

Income segmentation – provides guidance on income segmentation in modelling.

TAG Unit 3.10.2C: Variable Demand Modelling – Scope of the Model

Rail emissions – clarifies the guidance on modelling the impact of car competition on rail demand.

TAG Unit 3.3.5C: The Greenhouse Gases Sub-Objective
TAG Unit 3.5.6C: Values of Time and Vehicle Operating Costs

Intermodal competition – directs users to contact the department for guidance on rail emissions factors.

TAG Unit 3.15.4C: Rail Passenger Demand Forecasting Methodology


The consultation period for this guidance will continue until at least Friday 17th May 2013.


September 2009

We have updated modelling and appraisal guidance on Proportionality in Appraisal. In some cases, this will affect the amount of modelling and appraisal effort required. We have produced four new documents that will eventually replace the existing TAG Unit 2.1.

TAG Unit 2.1.1C: The Steps in the Process - Overview
TAG Unit 2.1.2C:
Option Development (Stage 1)
TAG Unit 2.1.3C:
Further Appraisal (Stage 2)
TAG Unit 2.1.4C:
Implementation, Monitoring and Evaluation (Stage 3)

and the following units have been updated:

TAG Unit 1.1C: Introduction
TAG Unit 1.3C:
Trunk Roads
TAG Unit 2.2C:
Objectives and Problems
TAG Unit 2.4C:
Summary Advice on Modelling
TAG Unit 2.5C:
The Appraisal Process
TAG Unit 3.1.1C:
Introduction to Modelling
TAG Unit 3.1.2C:
Transport Models
TAG Unit 3.2C:
Appraisal
TAG Unit 3.10.1C:
Variable Demand Modelling - Preliminary Assessment (updated 13 October 2009)
TAG Unit 3.10.2C: Variable Demand Modelling - Scope of the Model
TAG Unit 3.10.3C:
Variable Demand Modelling - Key Processes (updated 13 October 2009)

The consultation period for this guidance will continue until at least Sunday 26 February 2012.


We have revised these road pricing guidance documents to reflect the comments we received during the consultation period. Of the five guidance documents, two are unchanged or only marginally altered. In the others, there are changes for clarification, some simplification and improvements to the structure of content. It is clear that the more advanced parts of the guidance have not yet been used by scheme promoters designing road pricing schemes. Because the draft guidance has not been fully tested, it remains in the Consultation section of the website. The Department welcomes comments on these revised drafts for consideration when the guidance is next revised.

The Department has released for consultation draft guidance on the modelling and appraisal of local road pricing schemes.

TAG Unit 2.12C: Introduction to Modelling and Appraisal for Road Pricing
TAG Unit 3.12.1C:
Designing Efficient Local Road Pricing Schemes
TAG Unit 3.12.2C:
Modelling Road Pricing
TAG Unit 3.12.3C:
Appraisal of Road Pricing Options
TAG Unit 3.12.4C:
Measuring the Social and Distributional Impacts of Road Pricing Schemes

The consultation period for this guidance will continue until at least Sunday 26 February 2012.


Updated: May 2012