A major speed camera program was launched in April 1990 in Victoria which involved a dramatic increase in the detection of speeding offenders and a multi-million dollar, Statewide publicity campaign through all mass media. This report describes Phases 1 and 2 of an evaluation study examining its effects on crashes. Phase 1 examined the general effects Victoria-wide, in Melbourne, and in the rest of the State separately, and Phase 2 attempted to link the effects to the various speeding deterrence mechanisms (both specific and general deterrence) associated with the program. The results of Phase 1 indicated that the speed camera program in Victoria has been associated with decreases in the frequency of reported casualty crashes which occur in low alcohol times of the week and also decreases in their injury severity. These decreases have been calculated as departures from expected values based on past trends and seasonal patterns, changes in unemployment rate, and using the comparable areas of New South Wales as a control. The program appears to have had its greatest effects (in terms of decreases in the frequency of casualty crashes) on arterial roads in Melbourne and on 60 km/h roads in rural Victoria, where the majority of the speed camera operations have taken place within the respective Melbourne and country areas. This pattern of results provides further evidence that the observed effects relate to the speed camera program. The results of Phase 2 suggested that the reductions in the frequency of casualty crashes (in low alcohol hours) appeared to be linked with speed camera TINs (Traffic Infringement Notices) issued to detected drivers, Transport Accident Commission (TAC) road safety publicity in general and TAC speed related publicity in particular (lower level of significance). Reductions in the injury severity of casualty crashes (in low alcohol hours) appeared to be associated with speed camera TINs issued and hours of camera operation.