Which signal modalities do cyclists prefer based on experiences in road traffic?

Area of Science:

• Human-Computer Interaction
• Transportation Safety
• Signal Processing

Background:

• On-bike warning systems aim to enhance cyclist safety by alerting them to critical situations.
• The effectiveness of these systems depends on user acceptance, which is influenced by the warning modality.
• Previous research on cyclist warning preferences lacked field data and excluded key signal types.

Purpose of the Study:

• To evaluate cyclist preferences for different warning signal modalities (visual, auditory, vibro-tactile) based on real-world field experience.
• To determine which signal type is most effective and preferred for transmitting safety information to cyclists.
• To inform the design of future cyclist safety systems.

Main Methods:

• A field study was conducted where 55 participants cycled a 10 km route in traffic.
• Participants received 12 signals per modality (visual, auditory, vibro-tactile) at predefined GPS coordinates.
• Subjective experiences were collected via questionnaires after the ride, considering various environmental conditions.

Main Results:

• Cyclists showed a preference for auditory and vibro-tactile signals over visual signals.
• Auditory warnings were significantly preferred and perceived as more urgent and associated with warnings.
• Visual signals were found distracting, and vibro-tactile signals were confused with road vibrations.

Conclusions:

• Auditory signals are highly effective for cyclist warnings due to their noticeability and perceived urgency.
• Signal modality choice should balance noticeability, criticality, and user preference for optimal system design.
• Findings support the development of multimodal information transmission systems for cyclist safety.