Abstract
Comparisons have been made of the number of persons killed and casualty accidents in the three years before and after the introduction of sunday alcohol sales in the Perth metropolitan area. A significant increase in the proportion of persons killed and the number of casualty accidents on sundays as compared to the other six days of the week occurred. For the rest of the state area, where no changes in the alcohol trading laws occurred, no such increases were evident. It was concluded that the results of the study indicated that the new law had a detrimental effect on traffic safety. During the preparation of that paper a number of methodological issues arose. In view of the current interest in evaluative studies on the topic of alcohol and traffic safety, it is likely that other researchers could also encounter these issues in the future. Accordingly, the purpose of this paper is to discuss these issues under the four headings of experimental design, internal validity, external validity and number of experimental conditions. (A)
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