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*Interchange Spaces (between different modes of transport)
Each facility is rated on a seven point scale (-3 to +3) for different parameters such as effective width, dropped kerbs, [[permeability (spatial and transport planning)|permeability]] or personal security. These PERS ratings are linked to Red/Amber/Green (RAG) colour coding. The PERS software allows users to analyse and display walkability data using GIS maps, charts and quick win recommendation lists.
PERS was originally developed in 2001 by [[Transport Research Laboratory | TRL]] and [[London Borough of Bromley]]. The software tool (PERS 1) was designed to allow transport professionals and community groups to quickly and cost-effectively assess and rate the walkability of local streets and recommend improvements for pedestrians. This version of the tool assessed Links, Crossings and Routes. In 2005 [[Transport for London]] and [[Transport Research Laboratory | TRL]] co-developed PERS 2 which expanded the original system to include Public Transport Waiting Areas (PTWA), Public Spaces and Interchange Spaces. In 2009 [[Transport for London]] and [[Transport Research Laboratory | TRL]] further developed the tool into PERS 3 which included a built in GIS mapping tool and the ability to add photographs and [[Georeference | georeferences]] of quick wins (low cost, easy to implement physical improvements). PERS 3 also has the added functionality of automatically generate quick-win recommendation work lists for Highway work crews.
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