Driver Distraction: Eye Glance Analysis and Conversation Workload [Research Brief]

NHTSA · 2015 · ROSA P / United States. Federal Motor Carrier Safety Administration

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Summary

This research brief investigates the safety risks associated with driver distraction in commercial motor vehicles (CMVs), specifically focusing on secondary tasks, visual distraction, and conversation workload. The study aimed to determine whether performing secondary tasks, such as talking to passengers or using electronic devices, increases the likelihood of involvement in safety-critical events (SCEs) like crashes or near-crashes. It also sought to clarify the relationship between visual distraction, talking time, and conversation workload during real-world driving conditions. The analysis utilized naturalistic driving data collected from 6,379 commercial trucks and buses over a four-month period. Onboard monitoring systems captured 30-second video recordings, which were reviewed by analysts to identify SCEs, non-safety-related events, and randomly recorded events. The final dataset comprised 23,280 observations from 77 companies across 483 terminal locations, with 1,121 observations classified as SCEs. Due to small sample sizes for specific tasks, the analysis focused on aggregated secondary task categories: visual (e.g., looking at passengers or phones), visual/manual (e.g., handling radios or phones), talk/listen on an electronic device, and talk to passengers. The results indicated that talking to passengers was the only secondary task category significantly associated with an increased risk of SCEs. Drivers talking to passengers had odds ratios of 3.23 and 3.26 for SCEs compared to non-safety-related events, and 2.85 and 2.79 compared to random events. In contrast, talking or listening on an electronic device did not significantly increase the risk of SCEs. Similarly, the amount of time spent talking on an electronic device did not elevate risk. However, visual distraction was found to be significant; eyes-off-forward-road glances significantly increased the risk of voice-related SCEs, particularly in the intervals immediately preceding the triggering event. Visual and visual/manual tasks showed no significant impact, but the authors caution that this conclusion is premature due to low cell counts and insufficient data for meaningful interpretation. Data on conversation workload and emotional intensity were too sparse to allow for assessment. The study concludes that while electronic device usage does not inherently increase crash risk in this dataset, the timing of visual distractions is critical, with glances away from the road near an event posing a significant hazard. The finding that talking to passengers increases risk contradicts some prior studies suggesting passengers may aid safety, highlighting a potential safety deficit in interpersonal interactions. The authors emphasize that the lack of significant findings for visual/manual tasks should not be interpreted as safety, given the limited data. This research underscores the importance of analyzing specific behavioral contexts, such as glance timing and passenger interaction, in understanding CMV driver distraction.

Key finding

Talking to passengers significantly raised the odds of a safety-critical event (odds ratios near 3.2 versus non-safety events), while talking or listening on an electronic device did not.

Methodology

naturalistic

Sample size: 6379

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• visual
• temporal
• visual manual
• distraction detection algorithms
• cognitive
• manual

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, observational prevalence
• Theoretical Contribution: theory or model