Abstract
The Unley 40 km/h local area speed limit trial extented over a total period of 15 months. Its objective was to assess the reductions in traffic speeds following the imposition of the lower limit accompanied by systematic police enforcement using radar speed cameras at low and high levels of intensity. In particular, it was desired to establish whether such enforced lower speed limits could serve as an alternative to the installation of physical speed controls within local area traffic management schemes.