A point layer is required for each of eight core activities that will contribute to the accessibility model. These eight activities are:
· primary schools
· secondary schools
· further education
· convenience stores (dairies, petrol stations, convenience stores)
· places of employment (jobs).
These eight activities are based on the six trip purposes considered most important for people’s life-chances proposed by the British Government’s Social Exclusion Unit (SEU 2003). The six measures have been extended, by removing a single measure for schools and dividing primary and secondary schools into separate entities as well as adding a new measure for convenience stores. The inclusion of age-based schools improves the quality of the accessibility scores calculated later. The inclusion of convenience stores includes measurement to one of the more useful accessibility tests, being accessibility to milk and other convenience goods. These eight activity types are now referred to as the core+ activities for the remainder of this report and form the destination datasets for the network calculations. Different destinations are used in different part of the UK analysis. For example in Wales 14 trip purposes are used including post offices, libraries, pubs, significant transport nodes, leisure centres and sports facilities. The eight destinations recommended by the SEU were not adopted in quite this way by DfT since the data on shopping and leisure proved to be difficult to calibrate using any of the data sets available on floorspace and retail choice. Therefore town centres were used in 2006 as a proxy for a range of shopping and leisure facilities, and for access to friends and family and these were formally published as part of the core indicator data set from 2009.
In addition the UK analysis included many other facilities but excluded the calculation of the other indicators as funded by non-transport departments. Other facilities monitored annually include the locations of solicitors offering legal aid, county courts, crown courts, magistrates’ courts, pharmacies, free cash machines, banks, building societies and petrol stations.