“…urban, polycentric) are used to distinguish between functional regions. Thus functional regions based on travel-to-work flows are referred to as local labour market areas (originally discussed for example, by Goodman, 1970;Smart, 1974), or travel-to-work areas (originally discussed for example, by Ball, 1980;. Functional regions based on flows directly to an urban core are referred to as functional urban regions (originally discussed for example, by Berry, 1973;Hall and Hay, 1980), or, in cases where the flows have a daily rhythm as daily urban systems (originally discussed for example, by Berry, 1973;Hall, 1974;Coombes et al, 1979).…”