Blog - May 2010
The Department for Transport has published a report on how to include Social and Distributional Impacts (SDI) in transport appraisal. One outcome is new units for the Transport Analysis Guidance (TAG) methodology. It is recognised that some people gain and some loose from a transport development, and accordingly the SDIs considered include the distribution of monetised user benefits, distribution of noise and air quality, as well as personal affordability and community severance.
To incorporate SDIs into appraisal, it is necessary to identify the geographical areas that are impacted by the transport intervention. This means being able to model the land use changes that result from transport improvements. It also means recognising that the long run consequences of such improvements are not savings in travel time but improvements in access. So it will be hard effectively to incorporate SDIs into appraisal while supposed travel time savings remain the dominant monetary user benefit.
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