Inattentional blindness and information relevance of variable message signs

Area of Science:

• Human-computer interaction
• Traffic engineering
• Cognitive psychology

Background:

• Variable Message Signs (VMS) are crucial for traffic management.
• Potential for VMS to display non-traffic-related content exists.
• Effectiveness of VMS may be diminished by irrelevant information.

Purpose of the Study:

• To investigate the impact of irrelevant VMS messages on detour compliance and memory.
• To determine if practicing with irrelevant VMS content affects response to critical traffic information.

Main Methods:

• 39 participants were randomly assigned to three experimental groups in a driving simulator.
• Groups differed in VMS message exposure: detour only, irrelevant messages preceding detour, or inconsistent detour message.
• Measured compliance with detour, and later recall and recognition of the detour message.

Main Results:

• Significantly lower compliance with the detour message was observed when preceded by irrelevant VMS content.
• All groups demonstrated comparable memory performance (recall and recognition) for the detour message.
• Irrelevant VMS messages negatively impacted adherence to critical traffic instructions.

Conclusions:

• Irrelevant information on VMS, such as advertisements or safety slogans, can decrease compliance with essential traffic messages.
• VMS effectiveness in conveying critical information is potentially reduced by extraneous content.
• Future VMS design should prioritize traffic-relevant information to ensure driver compliance.