Fig. 1From: Neighbourhood walkability, road density and socio-economic status in Sydney, AustraliaSydney 2007: (a) Walkability quintiles (b) Traffic related air pollution (TRAP) quintiles measured by weighted road density (WRD) (c) Walkability-TRAP (WRD) tertile combinations – sweet, sour, high, low-spots (d) SES (Index of Relative Socio-economic Disadvantage (IRSD)) quintilesBack to article page