Study done with driving simulator. Makes sense to me.
University of Utah, Salt Lake City, Utah
Previous work on use of cell phones while driving compared cell phone conversations while driving with
driving only conditions. This study investigated how conversing on a cell phone differs from conversing
with a passenger. Participants conversed about close-call situations they experienced. We compared how
well drivers followed task instructions when driving only, when driving and conversing on a cell phone,
and when driving and conversing with a passenger. The results show that the number of driving errors was
highest in the cell-phone condition. Analyzing the conversations we found that in passenger conversations
more references were made to traffic and more turn taking followed those references than in cell phone
conversations. The results show that passenger conversations differ from cell phone conversations because
the surrounding traffic becomes a topic of the conversation, helping driver and passenger to share situation
awareness, and mitigating the potential effects of conversation on driving
http://www.distraction.gov/downloads...ed-driving.pdf
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