Driver Workload Management During Cell Phone Conversations Chip Wood,

Hurwitz, Joshua; Wood, Chip · 2005 · Crossref

DOI: 10.17077/drivingassessment.1162

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Summary

This study investigates whether intelligently suspending cell phone conversations during demanding driving situations improves driver performance and reduces subjective workload. Motivated by evidence that cognitive distractions, particularly active cell phone conversations, increase response times to unexpected events and correlate with accidents, the researchers aimed to determine if pausing these conversations during critical moments could mitigate safety risks. The core hypothesis was that because remote conversational partners cannot adapt to changing driving demands, suspending the interaction would allow drivers to reallocate cognitive resources to the driving task. The experiment utilized a high-fidelity driving simulator with 20 participants (mean age 32.7) performing a car-following task. Drivers followed a lead vehicle that randomly decelerated, requiring them to maintain safe headways. During the drive, participants engaged in spontaneous conversations categorized as "Intense" (controversial topics), "Neutral" (leisure topics), or "No" conversation. In one condition, conversations were suspended via audio cues when the lead car decelerated; in the other, they continued uninterrupted. Objective performance metrics included forward velocity, accelerator and brake pressure, headway distance, and temporal distance. Subjective workload was measured using the NASA TLX, and participants provided ratings on the utility of the suspension system. Results demonstrated that conversation intensity significantly affected both performance and workload. Engaging in an "Intense" conversation during deceleration led to smaller decreases in forward velocity and delayed responses in releasing the accelerator and applying the brake. Suspending these intense conversations counteracted these deficits, resulting in more rapid deceleration, earlier brake application, and increased headway and temporal distances from the lead vehicle. Subjectively, drivers reported higher mental and temporal demand, greater effort, and more frustration during intense conversations compared to neutral ones. However, they perceived better performance when conversations were suspended. Furthermore, approximately 65% of drivers agreed the suspension system was helpful and aided attention, while most disagreed that it interfered with driving or induced risk compensation. The findings confirm that cell phone conversation intensity imposes significant cognitive workload that degrades driving performance during critical events. Intelligently suspending conversations during such moments effectively restores performance metrics to safer levels and is viewed positively by users. This suggests that adaptive in-vehicle systems capable of modulating communication based on driving complexity could enhance safety by reducing the cognitive load imposed by distracting conversations.

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Topics

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• mobile phones
• manual
• cognitive
• passenger effects
• temporal
• auditory

Information type

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