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Wheeler misfortune

Letters

Paul Wheeler's article One of the crowd (NCE 4 March) provides an excellent introduction to Legion's pedestrian simulation software.

NCE readers may be interested in two clarifications.

The simulations of boarding and alighting (page 18) were produced for simulation studies commissioned by Cross-London Rail Links. These graphics should have been placed beside the Crossrail text box not the LUL text box.

The photographs of passengers alighting from an Underground train (page 19) were captured not by standard CCTV as indicated in the caption, but by a specialist team using Legion International's proprietary camera technology This technology and image processing techniques are used to capture and measure pedestrian behaviour. Legion International's library of data gathered over years in this way helps to ensure that simulated entities behave like real people.

The accuracy required is not possible with standard CCTV.

Martin Band, chief executive, Legion Ltd, 22-26 Albert Embankment, London SE1 7TJ

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