Driving while conversing: cell phones that distract and passengers who react

Area of Science:

• Human-Computer Interaction
• Cognitive Psychology
• Traffic Safety Research

Background:

• Driver distraction from conversations poses significant safety risks.
• Hands-free cell phone use is prevalent but may not be safer than handheld.
• In-car passenger conversations offer a comparison for understanding distraction effects.

Purpose of the Study:

• To compare driving performance during conversations with in-car passengers, hands-free cell phones, and remote passengers.
• To investigate the role of conversation modulation and passenger awareness in mitigating distraction.
• To evaluate if modified cell phones with warning tones can improve driving safety.

Main Methods:

• A driving simulator study comparing driver performance across different conversation types.
• Analysis of driving metrics: approach speeds, reaction times, hazard avoidance.
• Experimental manipulation of cell phone technology to include warning tones.

Main Results:

• Driving performance significantly decreased with cell phone and remote passenger conversations compared to in-car passengers and no conversation.
• Passengers naturally suppressed conversation (conversation suppression) and alerted drivers to hazards, unlike cell phone users.
• A modified cell phone with warning tones improved driving performance, approaching levels seen in non-conversing drivers.

Conclusions:

• Conversation modulation, not just passenger presence or visual cues, is crucial for maintaining driving performance.
• Hands-free cell phone conversations impair driving safety due to lack of adaptive conversation patterns.
• Technology incorporating warning cues can mitigate the adverse effects of cell phone use while driving.