Nighttime driving, passenger transport, and injury crash rates of young drivers

Rice, Thomas; Corinne Peek‐Asa; Kraus, J F · 2003 · OpenAlex-citations

DOI: 10.1136/ip.9.3.245

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Summary

This study investigates the independent and combined effects of nighttime driving and passenger presence on injury crash rates among 16- and 17-year-old drivers in California. Motivated by the implementation of graduated driver licensing systems across the United States, the research aims to clarify risk factors to inform policy restrictions. The authors analyzed data from the Statewide Integrated Traffic Records System (SWITRS) covering injury crashes from January 1993 to June 1998, prior to California’s graduated licensing implementation. Using an induced exposure method, the study identified 10,795 culpable young drivers (cases) and 12,906 non-culpable drivers involved in two-vehicle crashes (controls) to estimate driving exposure. Logistic regression was employed to calculate adjusted odds ratios for crash involvement, controlling for variables such as driver age, sex, alcohol use, and time of day. The results demonstrate that nighttime driving, lack of adult supervision, carrying passengers, alcohol use, being 16 years old, and male sex are all significantly associated with increased injury crash rates. Crash risk escalated sharply after 10 pm, with adjusted odds ratios reaching 10.63 for driving between 4 am and 6 am compared to daytime hours. Alcohol use was the strongest predictor, with drivers identified as having consumed alcohol being approximately 40 times more likely to be involved in a severe or fatal crash. Regarding passengers, carrying male teenage passengers or three or more mixed-gender passengers increased crash risk, whereas carrying mature adults (age 30+) was highly protective, reducing crash risk by approximately 70% compared to driving alone. Driving with female teenagers or children showed no significant increase in risk relative to driving alone. The findings indicate that the period between 10 pm and midnight is particularly dangerous for young drivers, despite lower rate ratios than later hours, due to the higher volume of driving during this window. The study concludes that nighttime driving restrictions beginning at 10 pm or earlier, combined with restrictions on carrying passengers at all hours, would likely enhance the effectiveness of graduated licensing systems. Furthermore, encouraging adult-supervised driving is identified as a critical strategy for reducing crash rates, as unsupervised driving carries significantly higher risk regardless of passenger presence. These results provide empirical support for specific policy interventions aimed at mitigating the high injury rates associated with novice drivers.

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Topics

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• graduated licensing
• passenger effects
• novice drivers
• parental management
• sex gender

Information type

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• Applied Guidance: policy recommendations
• Empirical Findings: crash risk outcomes