This paper considers the planning implications of large out of town commercial centres, their traffic impact and the challenge and opportunities posed to local authorities. The paper begins with an outline of the phases of retail out-of-town development from in town to out of town, illustrated by the M25 corridor to the West of London. Current large planning applications and their planning implications are outlined including reference to regional and emerging London-wide planning guidance. A description is provided of the role of the traffic engineer in estimating the traffic impact of out of town centres. Consideration is given to the variation of results obtained from West London trip generation studies. Reasons for the differences are suggested and proposals are made for improving the accuracy of traffic impact assessments. Finally, the challenge presented by out-of-town centres to existing large retail outlets is discussed with particular reference to Kingston upon Thames Town Centre. The measures used to improve the accessibility of town centres are described. These include a relief road scheme, improved car parking facilities and public transport, and better pedestrian and cycle facilities.
Abstract