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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. The Department released guidance on variable demand modelling as WebTAG 2.9 and 3.10 (June 2006) which indicates, among other things, that simple elasticity models should not be used to estimate variable demand modelling responses. However, it suggests that simple elasticity models may be used to narrow down scheme options before a full variable demand model (VDM) is used to establish more detailed effects of the schemes (WebTAG 3.10.3, Paragraph 1.2.4). Work was commissioned by the Department in March 2006 to look into the validity of this advice in the context of option sifting. The study investigated whether simple elasticity models could be used as a proxy model when the fully-specified VDM model would take a long time to run and a large number of exploratory option tests are required. The research concluded that elasticity models may be used to help rank options to assist in scheme selection, with the proviso that sufficient model convergence is achievable. The report also went on to make a number of recommendations in amending the current guidance. This consultation invites you to comment (before 21 September 2007) on the recommendations proposed and the Department's response.
The Department has released for consultation draft updated and expanded guidance on Option Values and Non-Use Values which will supersede the unit published in June 2003. TAG Unit 3.6.1: Option Values and Non-Use Values Comments on this document are welcome either emailed (itea@dft.gsi.gov.uk) or posted to: February 2007: 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 2.12: Introduction to Modelling and Appraisal for Road Pricing TAG Unit 3.12.1: Designing Efficient Local Road Pricing Schemes TAG Unit 3.12.2: Modelling Road Pricing TAG Unit 3.12.3: Appraisal of Road Pricing Options TAG Unit 3.12.4: Measuring the Social and Distributional Impacts of Road Pricing Schemes Comments on the above documents are welcome either emailed (itea@dft.gsi.gov.uk) or posted to: |
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