ABSTRACT
The capacity for people and goods to move around is a major concern in current socio-economic policies (CEC 2001; US DOT 2003). According to this view mobility provides unique benefits for both the economy and the individual. However the same movements are also acknowledged to be the cause of congestion and pollution, and the need for new road and rail links put increasing financial strains on public expenditure budgets. So, despite the benefits of mobility, maximising it is rarely defined as a policy objective, at least explicitly.
