Appraisal of Land-Use/Transport Interaction: Design
Report to Government Office for the North-West
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David Simmonds Consultancy |
January 2001
This report has been prepared by David Simmonds Consultancy. The work reported herein was carried out under a contract with the Secretary of State for the Environment, Transport and the Regions. Any views expressed are not necessarily those of the Secretary of State for the Environment, Transport and the Regions.
Executive summary
It is well known that the methods conventionally used to estimate user benefits arising from transport strategies are inapplicable if those strategies are expected to have impacts upon the distribution of land uses. This is an increasingly serious problem in transport appraisal practice. This report examines this problem and presents two different forms of a proposed practical solution to it. The problem and the proposed solutions are presented both mathematically and verbally. The solutions are potentially of fairly general applicability, and suggest that it might be possible to make progress in cases where land uses effects are quantified on the basis of professional judgement as well as in cases where models are used. However, the focus of interest is in the use of the Greater Manchester Strategy Planning Model (GMSPM), and the discussion therefore moves on to consider how the relevant solution relates first to the general characteristics of the modelling packages (DELTA and START) used in GMSPM, and then to the particular characteristics of GMSPM itself. It has to be recognized that there are a number of difficulties to be addressed in attaching user benefit calculations to GMSPM, but suggestions are made for dealing with these. Overall, it is felt that it would be desirable to implement the proposed system on the basis of the design work reported here, though it has to be recognized that the use of the system would be experimental. In particular, it is impossible to foresee the issues that might arise in seeking to make a practical interpretation of real results from testing real strategies This document therefore constitutes both a report on the analysis carried out and a technical proposal for further work. The financial proposal for the further work has been circulated separately.
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