Unlicensed driving remains a serious problem for road safety, despite ongoing improvements in traffic law enforcement practices and technology. While it does not play a direct causative role in road crashes, unlicensed driving undermines the integrity of the driver licensing system and is associated with a range of high-risk behaviours. This thesis documents three studies that were undertaken to explore the scope and nature of unlicensed driving, in order to develop more effective countermeasures to the behaviour.----- Study One utilised official road crash data from the Australian state of Queensland to compare the crash involvement patterns of unlicensed drivers with those of licensed drivers. The results confirmed that unlicensed driving is a relatively small, but significant road safety problem. Unlicensed drivers represent over 6% of the drivers involved in fatal crashes and 5% of those in serious injury crashes. Based on a quasi-induced exposure method, unlicensed drivers were found to be almost three times as likely to be involved in a crash than licensed drivers. In the event of a crash, those involving unlicensed drivers were twice as likely to result in a fatality or serious injury. Consistent with these results, the serious crashes involving unlicensed drivers were more likely to feature risky driving behaviours, such as drink driving, speeding and motorcycle use, than those involving licensed drivers.----- Study Two involved a cross-sectional survey of 309 unlicensed driving offenders who were recruited at the Brisbane Central Magistrates Court. The survey involved a face-to-face interview that took approximately 25 minutes to complete and achieved a response rate of 62.4%. A wide range of offenders participated in the study, including: disqualified and suspended drivers; expired licence holders; drivers without a current or appropriate licence; and those who had never been licensed. The results reinforced concerns about the on-road behaviour of unlicensed drivers. Almost one quarter of all the offenders reported driving unlicensed when they thought they might have been over the alcohol limit. Similarly, 25% reported exceeding the speed limit by 10 km/h or more on most or all occasions, while 15% admitted that they didn't always wear their seat belt. In addition, the results indicated that unlicensed drivers should not be viewed as a homogeneous group. Significant differences were found between the offender types in terms of their socio-demographic characteristics (age, education level, prior criminal convictions); driving history (prior convictions for unlicensed driving and other traffic offences); whether they were aware of being unlicensed; the degree to which they limited their driving while unlicensed; and their drink driving behaviour. In particular, a more deviant sub-group of offenders was identified, that included the disqualified, not currently licensed and never licensed drivers, who reported higher levels of prior criminal offending, alcohol misuse and self-reported drink driving. The results of Study Two also highlight the shortcomings of existing police enforcement practices. Almost one-third of the sample reported that they continued to drive unlicensed after being detected by the police (up until the time of the court hearing), while many offenders reported experiences of punishment avoidance. For example, over one third of the participants reported being pulled over by the police while driving unlicensed and not having their licence checked.----- Study Three involved the further analysis of the cross-sectional survey data to explore the factors contributing to unlicensed driving. It examined the influence of various personal, social and environmental factors on three aspects of the offenders' behaviour: the frequency of their driving while unlicensed; whether they continued to drive unlicensed after being detected; and their intentions to drive unlicensed in the future. This study was also designed to assess the capacity of a number of different theoretical perspectives to explain unlicensed driving behaviour, including deterrence theory and Akers' (1977) social learning theory. At an applied level, the results of Study Three indicated that personal and social factors exert the strongest influence over unlicensed driving behaviour. The main personal influences on unlicensed driving were: the need to drive for work purposes; exposure to punishment avoidance; personal attitudes to unlicensed driving; and anticipated punishments for the behaviour. The main social influences reflected the social learning construct of differential association, namely being exposed to significant others who both engage in unlicensed driving (behavioural dimension) and hold positive attitudes to the behaviour (normative dimension). At a theoretical level, the results of Study Three have two important implications for traffic psychology and criminology. Firstly, they provided partial support for Stafford and Warr's (1993) reconceptualisation of deterrence theory by demonstrating that the inclusion of punishment avoidance can improve the overall predictive utility of the perspective. Secondly, they suggested that social learning theory represents a more comprehensive framework for predicting illegal driving behaviours, such as unlicensed driving. This is consistent with Akers' (1977; 1990) assertion that formal deterrence processes can be subsumed within social learning theory.----- Together, the results of the three studies have important implications for road safety. Most importantly, they question the common assumption that unlicensed drivers drive in a more cautious manner to avoid detection. While the findings indicate that many offenders reduce their overall driving exposure in order to avoid detection, this does not appear to result in safer driving. While it remains possible that unlicensed drivers tend to act more cautiously than they would otherwise, it appears that their driving behaviour is primarily designed to reduce their chances of detection. In terms of countermeasures, the research indicates that a multi-strategy approach is required to address the problem of unlicensed driving. Unlicensed drivers do not represent a homogeneous group who are likely to be influenced by the threat of punishment alone. Rather, innovative strategies are required to address the wide range of factors that appear to encourage or facilitate the behaviour. Foremost among these are punishment avoidance and the need to drive for work purposes.

This research sought to understand the relationship between licensing policy and the opportunity for the development of a scientifically-based approach to identifying high risk older drivers based on prior driving history. This research focused on five tasks: 1) review of the literature, 2) compilation of information on licensing policy for use by decision-makers, 3) assessment of charges and payer source for older driver crashes using linked crash and hospital data , and 4) the development and 5) validation of an older driver crash prediction model. There is relatively little available in the way of information for policymakers regarding licensing, and there is even less information available on evaluation of licensing practice effectiveness. Emergency department charges for older males were lower than females even though males accounted for a larger percentage of the injured population. Older drivers were no more likely to be covered by public insurance than the comparison group. Crash and citation data used to develop a driver history showed no differences between drivers in injury causing crashes and drivers in non-injury crashes. Logistic regression, Poisson regression, and negative binomial regression models were unable to effectively predict crash involvement based on driver history. This is likely due to self-selection bias for older drivers and truncated distribution of count variable (injury causing crashes). Recommendations resulting from this research include Massachusetts and national policy recommendations and additional research. Massachusetts should expand beyond its referral-based system for reviewing older drivers, consider restriction rather than only revocation, review medical advisory board practices, conduct evaluation of any policies it does implement, and conduct a thorough review of alternative transportation options. Nationally, efforts should focus on developing effective cognitive/functional testing by licensing agents, identification of effective second phase of testing, determination of a mechanism for determining when to retest, and assessment of the differences between older males and females for potential use in training, education, and testing. Research recommendations include continued exploration of the potential for systematic identification of high risk drivers using administrative data and in-depth analyses of the differences between males and females in terms of aging and driver safety.

Thèse numérisée par la Direction des bibliothèques de l'Université de Montréal.