Abstract
Despite numerous studies showing the effectiveness of speed enforcement, especially automated speed enforcement, in reducing crashes, public debate still continues in regard to the revenue-raising aspect of speed enforcement. Using speed camera enforcement data from the City of Edmonton, this study found that catching offenders had a significant effect in reducing injury crashes that was beyond the deterrent effect provided by the presence of police on the roads alone. The apprehension of offenders is therefore a key component needed to maximise the effectiveness of the speed camera programme and not solely as a means to raise revenue.