Hazard perception in novice and experienced drivers: The effects of sleepiness

Smith, Simon S.; Horswill, Mark S.; Chambers, Brooke; Wetton, Mark · 2009 · OpenAlex-citations

DOI: 10.1016/j.aap.2009.03.016

archive: archived pipeline: cataloged verified

Get this paper ↗ (DOI — opens at the source; we link to it, we don't host it)

Summary

This study investigates how sleepiness affects hazard perception abilities in novice versus experienced drivers, addressing the disproportionate involvement of young, inexperienced drivers in sleepiness-related crashes. While sleepiness is a known contributor to road accidents, the specific impact on hazard perception—a skill correlated with crash risk—had not been previously examined. The researchers hypothesized that novice drivers would be more vulnerable to the impairing effects of sleepiness than experienced drivers, potentially explaining higher crash rates among the former group. The study employed a between-subjects design with 62 participants: 32 novice drivers (aged 17–24, mean experience 1.65 years) and 30 experienced drivers (aged 28–36, mean experience 14.41 years). Participants were assigned to either a low-sleepiness condition (tested at 10 am) or a high-sleepiness condition (tested at 3 am). All participants completed a validated video-based hazard perception test, where they clicked on potential traffic conflicts in driver-perspective footage. Sleepiness levels were verified using the Stanford Sleepiness Scale, and baseline sleep habits were monitored via diaries and standard scales to ensure no significant differences between groups prior to testing. A simple spatial reaction time task was also administered to control for general motor response differences. Results indicated a significant interaction between driver experience and sleepiness. Novice drivers exhibited significantly slower hazard perception response latencies during the 3 am session compared to the 10 am session. In contrast, experienced drivers showed no significant change in response times between the two conditions. Experienced drivers generally responded faster than novices in both conditions and detected a higher proportion of hazards. However, experienced drivers were slower in the simple spatial reaction time task, suggesting that the hazard perception findings were specific to cognitive processing rather than general motor speed. The sleepiness manipulation was effective, with participants reporting significantly higher sleepiness scores at 3 am. The findings suggest that mild sleepiness disproportionately impairs the hazard perception skills of novice drivers, slowing their ability to anticipate traffic conflicts by a mean of 0.38 seconds. This delay is equivalent to traveling 6.33 meters at 60 kph, highlighting significant safety implications. The study concludes that the higher crash risk among young drivers during sleepiness may stem from this specific cognitive vulnerability. The authors recommend interventions such as targeted hazard perception training for novices and strategies to reduce sleepiness, such as night-time driving restrictions or sleep education, to mitigate these risks.

Provenance

The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed.

Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.

Topics

Ranked by relevance to this paper. Hover a topic for its definition.

• novice drivers
• hazard perception
• hazard perception training
• vigilance
• drowsiness
• sleep deprivation

Information type

What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).

• Empirical Findings: behavioral performance data, physiological data
• Theoretical Contribution: theory or model