Drink-driving law enforcement and the legal blood alcohol limit in New South Wales.

This paper reports the results of a preliminary analysis of daily fatal crashes in New South Wales, Australia, between July 1975 and December 1986. The analysis unexpectedly uncovered a small but statistically significant decline in crashes coinciding with the introduction of a law lowering the legal blood alcohol concentration (BAC) from .08 to .05 g%. The original aim of the analysis was to develop for a larger study appropriate log-linear techniques to assess the impact of a range of government initiatives, including laws aimed at the drinking driver: increased penalties, the .05 law, and random breath testing (RBT). The analysis showed that RBT immediately reduced fatal crashes by 19.5% overall and by 30% during holiday periods, and that the .05 law, introduced two years before RBT, apparently reduced fatal crashes by 13% on Saturdays. There was no significant effect of the .05 law on any other day of the week, and there was no clear evidence that any other initiative had a statistically significant effect on accidents. Although the apparent impact of the .05 law was small, it is surprising that any effect was discernible, since the law was not extensively advertised and police enforcement was no more intense than is usual over Christmas. However, any effects of the .05 law may not have been sustained if RBT had not been introduced two years later.

Random breath testing in Australia: getting it to work according to specifications.

After reading the deterrence literature, particularly the work of H. Laurence Ross, I concluded in the late 1970's that many road accidents could be prevented through the wholehearted implementation of random breath testing (RBT). RBT is a system of drink-drive law enforcement which aims to increase the perceived likelihood of apprehension through the use of mass breath testing techniques at roadblocks which are highly visible, are unpredictable in their locations and give the impression of ubiquity. As the result of public pressure, RBT was introduced in NSW in December 1982, with spectacular results. The law was intensively enforced and extensively advertised, partly due to the advocacy of researchers such as myself, but also because ther was an acute political need for instant results. Since RBT is a difficult enforcement technique for police to sustain in effective form, researchers must strive to improve their understanding of what works, and remain in close contact with police, policy makers and politicians. Although this process is costly in terms of time and, possibly, academic 'pay-off', it is essential if the fragile understanding of deterrence principles amongst these groups is not to lead to superficially attractive, but probably ineffective techniques such as low visibility mobile RBT.

Young people, alcohol, and driving in two Australian states.

Road traffic accidents are the single largest cause of death in Australia among people aged 15-24. The proposition that a broadly based deterrence measure, such as random breath testing (RBT), would be sufficient to change the behavior of young drivers was tested in a comparison of young drivers in New South Wales (NSW), which has had RBT for 6 years, with young drivers in Western Australia (WA), where there was no RBT. The results demonstrated that NSW young drivers were less likely to drink and drive and more likely to believe their peers would disapprove of drink-driving than were their counterparts in WA. It was concluded that RBT had altered the drink-driving behavior and possibly the beliefs about drink-driving of young people in NSW.

Drinkers and their driving: compliance with drinking-driving legislation in four Australian states.

This study replicates work in Norway and the United States in investigating the extent to which Australian drivers attempt to comply with drinking-driving legislation. In a four-state survey of 1,133 drinkers, it was found that people were aware of the need to control their alcohol input before driving, and derived estimates of blood alcohol after a recent away-from-home drinking occasion demonstrated that the amount people drank was influenced by whether or not they were driving. Drivers reported drinking less than nondrivers and were also those who usually consumed less alcohol. These findings were also true of people with different levels of normal consumption. Although these results are encouraging, it is suggested that there is need for further modification of sanctions, and that the community needs more information about the alcohol content of drinks and drink sizes if people are to moderate effectively their drinking before driving.

The impact of random breath testing in New South Wales, December, 1982 to February, 1983.

A survey to investigate the impact of random breath testing (RBT) was carried out in late February, 1983. The survey sample comprised 400 Sydney residents. In the first 10 weeks of operation, nearly half the Sydney population were directly exposed to RBT, either by being tested themselves or by driving past other people being tested. Despite this high penetration rate, many licence holders regarded their chances of being tested as lower than they were when RBT was first introduced, in December, 1982. Men, younger respondents, and heavy drinkers had higher rates of exposure to RBT, rated their chances of being tested more highly than did other groups and more often reported changes in behaviour due to RBT. However, respondents in these groups also more often reported drinking and driving since the advent of RBT. The implications of these findings for police law enforcement strategies and for the current debate on mandatory zero blood alcohol levels among provisionally licensed (P-plate) drivers are considered.