Exploring False Warnings and Modalities for Emergency Vehicle Alerts and Their Impact on Driver Behavior.

Area of Science:

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

Background:

• Emergency Vehicle Approaching (EVA) alerts can reduce emergency vehicle delays.
• False alarms and poor warning design can reduce the effectiveness of EVA alerts.
• Non-visual alerts may enhance driver performance with EVA systems.

Purpose of the Study:

• To investigate the impact of false alarms on driver response to EVA alerts.
• To evaluate the effectiveness of different warning modalities (auditory vs. visual) for EVA alerts.
• To understand the order effects of false warnings on driver behavior in a simulated driving environment.

Main Methods:

• A driving simulator study involving 80 participants.
• Participants received three EVA alerts during a 30-minute drive, with one false alarm.
• Two groups experienced different orders of true and false alerts; half received auditory warnings, half visual.

Main Results:

• Drivers responded faster to auditory warnings than visual warnings.
• A false alarm preceding a true alert led to slower driver responses compared to the first interaction.
• No order effect was observed in the third interaction when drivers received one true and one false warning.

Conclusions:

• Both the modality of the alert (auditory vs. visual) and the occurrence of false alarms significantly influence driver behavior.
• The order in which drivers encounter false alarms can negatively impact their reaction time to subsequent critical alerts.
• Auditory warnings are potentially more effective for in-car warning systems, and the impact of false alarms must be considered in system design.