A comparison of uncontrolled, give way sign controlled and stop sign controlled intersections in South Australia

Abstract

The Centre for Automotive Safety Research (CASR) has undertaken study to compare uncontrolled, give way and stop sign controlled intersections as used in South Australia. The answers to two basic questions are desired: is more control justified if safety is impaired; and do road users differentiate by the type of control employed? The use of different levels of control was investigated through a literature review, analysis of in-depth crash investigation files and a survey of road users in South Australia. There appears to be some benefit to the use of greater control but the reasons behind this are unknown. The survey results also suggest a residual of road users are confused and prone to error at controlled and uncontrolled intersections. Recommendations to help remedy this issue include adding redundancy at intersections through the use of Safe System design principles, controlling all uncontrolled T-junctions and upgrading superseded intersection advanced warning signs.