Advances in public transport accessibility assessments for development control - a proposed methodology

Abstract

UK government policy for new developments requires an assessment of site accessibility by public transport. PTAL (Public Transport Accessibility Level) methodology is used as a tool for measuring access to the local public transport network, but it does not consider the ability to travel beyond the immediate area of a proposed site. This paper describes the development of a quantitative assessment method for public transport network accessibility as an alternative to PTAL. Four different approaches were evaluated. These were based on the estimation of total public transport catchment area within 60 minutes (A), total population within 60 minutes by public transport (B), relative population within 60 minutes by public transport (C), and weighted relative population within 60 minutes by public transport (D). A total of 90 sites in the south east of England were used to develop a dataset. The most appropriate approach was approach C modified to relative population within 60 minutes (London) and 40 minutes (outside London) by public transport. This method could be defined as the Public Transport Relative Accessibility Percentage (PTRAP). The application of PTRAP to Bank in central London, a large employment site in Brentford, Brighton town centre, and an out of town location in Ashford is described.

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