Comparing handheld and hands-free cell phone usage behaviors while driving.

Area of Science:

• Human-computer interaction
• Transportation safety
• Cognitive psychology

Background:

• Cell phone use while driving is a significant safety concern.
• Understanding driver behavior with different phone types is crucial for developing effective interventions.

Purpose of the Study:

• To compare cell phone usage behaviors across handheld (HH), portable hands-free (PHF), and integrated hands-free (IHF) systems.
• To analyze naturalistic driving data to observe real-world cell phone interaction patterns.

Main Methods:

• Naturalistic driving data and personal cell phone call records were collected.
• Cell phone subtasks, secondary tasks, and other behaviors were observed and classified.
• Drivers were categorized based on self-reported primary cell phone usage type.

Main Results:

• Drivers with hands-free systems frequently used handheld phones (over 50% of interactions).
• Talking/listening durations were longer with PHF and IHF compared to HH.
• HH dialing and ending calls took significantly longer than PHF/IHF tasks.
• Eating/drinking occurred more often during IHF use than HH use.

Conclusions:

• Hands-free technology reduces visual-manual cell phone task duration.
• Drivers continue to opt for handheld phones despite available hands-free alternatives.
• Further research is needed to address persistent handheld phone use while driving.