Previous papers by the authors have documented experiences in the City of Unley in relation to a citywide 40 kilometres per hour speed limit. This paper documents further findings in relation to enforcement and crash outcomes as separate issues and some discussion is made on the possible impacts of the new 50 kilometres per hour General Urban Speed Limit (GUSL). A trial with enforcement on 40 kilometres per hour local roads was conducted to determine halo effects in combination with traffic monitoring equipment. Laser gun enforcement was shown to be most effective with an effect lasting up to 10 days from the time of deployment. Speed feedback signs (at enforcement sites) were shown to have no halo effect and lost effectiveness with continued deployment at the same site. In reviewing crash data from before and after the implementation of the 40 kilometres per hour scheme, it is concluded that the 40 kilometres per hour speed limit has been responsible for a reduction in crashes on local roads given the 60 kilometres per hour GUSL operating elsewhere. (Author/publisher) For the covering entry of this conference, please see ITRD abstract no. E210298.
Samenvatting