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Recent research indicates that perceived behavioral control is the strongest predictor of drowsy driving intention and willingness in young adult university students. This research also suggests that elevated perceived behavioral control concerning drowsy driving may impact a person’s perceptions of risk regarding drowsy driving, which subsequently may impact drowsy driving intention and willingness. Questionnaire data on drowsy driving beliefs and perceptions previously collected from 497 students at a university in the United States was used to investigate the relationship between perceived behavioral control, risk perception, intention, and willingness related to drowsy driving behavior. Regression analyses and Sobel tests revealed that drowsy driving risk perception partially mediates the relationship between perceived behavioral control and willingness to drive drowsy: greater perceived control over drowsy driving behavior decreases perceived risk concerning drowsy driving, which in turn increases willingness to engage in drowsy driving behavior. Limited evidence also was produced indicating that drowsy driving risk perception partially mediates the relationship between perceived behavioral control and intention to drive drowsy. These findings suggest important theory-based messaging strategies that can be developed to alter perceptions and subsequent behavior related to drowsy driving in young adult U.S. drivers.

Texting while driving is prevalent among college-aged students, despite distracted driving laws. Social Norms Theory suggests that individuals are influenced by perceptions of how their social groups act. Proximal sources of social influence, such as significant others (S.O.) may be more likely to effect college-aged students than distal sources (e.g. people they know in their friend or peer group, but don’t identify as people with whom they have a particularly important or meaningful relationship). We investigated whether perceived S.O. texting behaviors mediated the relationship between perceived risk of texting while driving and reported texting while driving among college-aged students. A sample of 835 undergraduate licensed drivers were surveyed about the influence of perceived risk of texting while driving on texting while driving within the past month. We examined whether seeing one’s S.O. (versus their friends) texting while driving mediated this effect. Two groups of drivers were considered: low-risk drivers, who never received a traffic citation nor got into a crash, and high-risk drivers, who had ever received traffic citation and been involved in a crash. We also examined gender differences within low-risk and high-risk groups. A series of logistic regressions, adjusting for gender and ethnicity, were conducted along with Sobel Tests to evaluate the significance of the mediation effect. Results showed that perceptions of the S.O. partially mediated the relationship between perceived risk of texting while driving and texting while driving. This effect was also observed for low risk (female only) and high risk drivers. There was no mediation effect for distal sources. These findings bolster the limited research on the importance of proximal sources of social influence and suggest prevention efforts should focus on proximal social networks of college-aged students as opposed to distal social influences when targeting young adults distracted driving.

Background Previous studies have shown increased precipitation to be associated with higher frequency of traffic collisions. However, data regarding how extreme weather events, projected to grow in frequency, intensity, and duration in response to a changing climate, might affect the risk of motor vehicle collisions is particularly limited. We investigated the association between frequency of extreme heat and precipitation events and risk of motor vehicle collision in Maryland between 2000 and 2012. Methods Motor vehicle collision data was obtained from the Maryland Automated Accident Reporting System. Each observation in the data set corresponded to a unique collision event. This data was linked to extreme heat and precipitation events that were calculated using location and calendar day specific thresholds. A time-stratified case-crossover analysis was utilized to assess the association between exposure to extreme heat and precipitation events and risk of motor vehicle collision. Additional stratified analyses examined risk by road condition, season, and collisions involving only one vehicle. Results Overall, there were over 1.28 million motor vehicle collisions recorded in Maryland between 2000 and 2012, of which 461,009 involved injuries or death. There was a 23% increase in risk of collision for every 1-day increase in extreme precipitation event (Odds Ratios (OR) 1.23, 95% Confidence Interval (CI): 1.22, 1.27). This risk was considerably higher for collisions on roads with a defect or obstruction (OR: 1.46, 95% CI: 1.40, 1.52) and those involving a single vehicle (OR: 1.41, 95% CI: 1.39, 1.43). Change in risk associated with extreme heat events was marginal at best. Conclusion Extreme precipitation events are associated with an increased risk of motor vehicle collisions in Maryland.

Introduction Texting while driving is a significant risk factor for automobile collisions. The use of cell phones is prevalent among young people and commonly reported when they drive. Method A web-based survey of 861 college student drivers determined how texting was associated with other forms of risky driving, perceptions of risk, and their driving and texting interactions with a significant other. Results Texting drivers were more likely to engage in other risky driving behaviors, perceived less risk in texting and driving, felt more immune to traffic risks, and had friends who text and drive. Logistic regression analyses showed that even after adjusting for risky driving behaviors and perceived risk, texting drivers were significantly more likely to do so if they saw their significant other text and drive. Conclusions Traffic safety campaigns need to address important social influences on this behavior.

Extensive research has examined alcohol use context and motives among undergraduates, but less is known about where, when, and why graduate students drink. The current study aimed to describe the motives and situational context of graduate student alcohol use, identify demographic and program characteristics associated with alcohol use motives and context, and assess how alcohol use motives and context are associated with alcohol use behavior. A sample of master’s and doctoral-level students who drank during the past month (n = 2091; 63% female) completed an online survey. An exploratory factor analysis yielded two situational context factors: drinking in social situations (e.g., with friends, at a bar) and non-social situations (e.g., alone, at home). Graduate students most frequently endorsed social and enhancement drinking motives. Results of multivariate linear regression models showed that age, sex, race/ethnicity, and international student, marital, parental, and employment status were all associated with motives and context. Drinking for enhancement and drinking to cope were the motives most strongly associated with increased alcohol quantity and frequency, respectively. Drinking in social contexts was positively associated with alcohol quantity and frequency, and drinking in non-social contexts was positively associated with alcohol use frequency but inversely related to alcohol quantity. Graduate students who drink for enhancement reasons and in social situations might be at increased risk for higher quantity alcohol use, or graduate students who drink for coping reasons and in non-social situations might be at increased risk for more frequent alcohol use. Future longitudinal research is needed to explore whether drinking in certain contexts and with certain motivations is predictive of alcohol problems during and after graduate school.

Being a hurried driver is associated with a variety of risky driving behaviors, yet the mechanisms underlying this behavior remain unknown. Distress tolerance, defined as an individual's capability to experience and endure negative emotional states, was examined as a predictor of hurried driving among 769 college students. Results indicate that after controlling for age, gender, race, ethnicity, the student's year in school, their grade point average, driving frequency, angry driving, aggressive driving as well as other forms of self-reported risky driving; hurried driving was significantly associated with lower levels of distress tolerance. Hurried drivers also reported greater levels of frustration and impatience with other drivers, suggesting that they have difficulty in withstanding or coping with negative psychological states when driving. Traditional traffic safety campaigns that emphasize enforcement may be less successful with these drivers. The need to develop campaigns that address the affective coping abilities that contribute to this behavioral pattern is discussed.

INTRODUCTION: The purpose of this investigation was to compare the results of a web-based and a telephone interview survey measuring driver concerns about a variety of traffic safety issues, their beliefs, and specific driving behaviors. METHOD: State-wide, annual random digit-dial telephone surveys and web-based surveys were conducted in Maryland. A total of 1,700 drivers were surveyed by telephone and 6,806 took a web survey. RESULTS: Telephone respondents were more likely to be female and older. Web respondents were more likely to be white and not Latino/Hispanic. After controlling for demographic differences, telephone survey respondents were more likely to be concerned about traffic safety. They were more likely to believe that sobriety checkpoints reduce drunk driving (OR=2.18, 95% CI 1.94, 2.45), they would be ticketed for not wearing a seat belt (OR=1.26, 95% CI 1.12, 1.43), and they would be stopped by the police if they drove after drinking too much (OR=1.17, 95% CI 1.03, 1.32). They were less likely to report a variety of risky behaviors including using a cell phone while driving (OR=.54, 95% CI .48, .61) and driving 10+ mph over the speed limit (OR=.81, 95% CI .72, .91), but were more likely to report having been ticketed for a moving violation in the last month (OR=2.22, 95% CI 1.70, 2.90). Suggestions are offered for overcoming potential sources of sampling bias. IMPACT ON INDUSTRY: Web-based surveys produce substantially different results than random-digit-dial telephone surveys, when used for public assessments of traffic safety concerns and behaviors. Language: en

Few studies have investigated the association between the social context of cannabis use and cannabis use disorder (CUD). This longitudinal study of college students aimed to: develop a social context measure of cannabis use; examine the degree to which social context is associated with the transition from non-problematic cannabis use to CUD; and, examine the association between social context of cannabis use and depressive symptoms. The analytic sample consisted of 322 past-year cannabis users at baseline. Four distinct and internally consistent social context scales were found (i.e., social facilitation, emotional pain, sex-seeking, and peer acceptance). Persistent CUD (meeting DSM-IV criteria for CUD at baseline and twelve months later) was associated with using cannabis in social facilitation or emotional pain contexts, controlling for frequency of cannabis use and alcohol use quantity. Students with higher levels of depressive symptoms were more likely to use cannabis in an emotional pain or sex-seeking context. These findings highlight the importance of examining the social contextual factors relating to substance use among college students.

Introduction The purpose of this investigation was to identify risky driving behaviors and dispositions that distinguish drivers who use a cell phone while operating a motor vehicle from non-cell phone using drivers. Method Annual telephone surveys were used to identify drivers who reported using a cell phone while driving in the last month (n = 1803) and were compared to those who said they did not use cell phones while driving (n = 1578). Results Cell phone using drivers were more likely to report driving while drowsy, going 20 mph over the speed limit, driving aggressively, running a stop sign or red light, and driving after having had several drinks. They were also more likely to have had a prior history of citation and crash involvement than non-cell phone using drivers. Cell phone using drivers also reported they were less careful and more in a hurry when they drive than non-cell phone using drivers. Conclusion Cell phone using drivers report engaging in many behaviors that place them at risk for a traffic crash, independent of the specific driving impairments that cell phone usage may produce. Strategies that combine coordinated and sustained enforcement activities along with widespread public awareness campaigns hold promise as effective countermeasures for these drivers, who resemble aggressive drivers in many respects.

A series of items that measure the social context of alcohol consumption among adolescents was administered in a questionnaire survey to over 1,300 high school students. Emerging from a factor analysis were five factors which suggested that drinking occurs in the following social contexts: drinking for social facilitation where adults are not present, drinking at school or during school-related activities, drinking for stress control, drinking for conformity or to be part of a group, and drinking under parental supervision at home. Scales based on these factors appeared to be reliable, free from social desirability bias, and able to discriminate problem drinkers from nonproblem drinkers. The most important of these factors was drinking for social facilitation that is not restrained by the presence of adults. These findings reinforce the validity of examining the social context of drinking (which involves situational as well as motivational reasons for drinking) to uncover important etiological contributors of alcohol abuse in an adolescent population.