Warning Sound to Affect Perceived Speed in Approaching Roundabouts: Experiments with a Driving Simulator

Rossi, Riccardo; Gastaldi, Massimiliano; Biondi, Francesco; Mulatti, Claudio · 2013 · Procedia - Social and Behavioral Sciences

DOI: 10.1016/j.sbspro.2013.10.609

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Summary

This study investigates the effectiveness of auditory warning sounds as a traffic-calming measure to reduce vehicle speeds when approaching roundabouts. Motivated by the United Nations’ identification of excessive speed as a primary cause of road fatalities, the research explores whether Advanced Driver Assistance Systems (ADAS) that emit audible pitches can influence drivers' perceived speed and subsequent braking behavior. The authors aim to determine if auditory cues, unlike visual road markings which often suffer from a "novelty effect" where effectiveness wanes over time, can provide a sustained reduction in speed. The experiment was conducted using a fixed-base driving simulator at the University of Padova. Twenty-seven participants, all with at least one year of driving experience, drove along an 8.73 km circuit featuring seven identical roundabouts. The study compared a control condition (no countermeasures) against three auditory treatments activated on the approach lane: a continuous pitch, pitches triggered by vehicle detectors at constant 20-meter intervals, and pitches triggered at decreasing intervals (wide-to-thin, ranging from 20 to 5 meters). Participants completed five laps, encountering each treatment ten times. Speed data were collected at five observation points approaching the roundabout entry and standardized to account for initial entry speeds. The results indicated that drivers reduced their speed as they approached the roundabout regardless of the treatment. However, only the continuous pitch condition produced a statistically significant reduction in speed compared to the control condition. The constant and decreasing interval pitches resulted in only minor, non-significant speed reductions. The continuous beeping led to a speed reduction of up to 3.3%, which remained significant even when drivers were 20 meters from the roundabout entry. Analysis revealed that the effect of continuous beeping was strongest immediately after activation and diminished as the driver got closer to the hazard, suggesting it promotes smoother braking. The authors conclude that continuous auditory warnings are effective for speed reduction in high-risk zones, potentially offering a more consistent alternative to visual measures. However, they note that extended beeping may cause driver annoyance, suggesting that shorter continuous beeps could maintain effectiveness while improving user acceptance. The study acknowledges limitations, including the lack of subjective feedback on driver annoyance and the potential for auditory warnings to trigger involuntary startle responses, which could negatively impact vehicle control. Future research is recommended to assess these psychophysiological effects and test the system in real-world driving scenarios.

Key finding

Continuous auditory warning pitches significantly reduced driver speeds approaching a roundabout compared to control conditions, constant-spaced pitches, and decreasing-spaced pitches.

Methodology

simulator

Sample size: 27

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

Ranked by relevance to this paper. Hover a topic for its definition.

• auditory warnings
• perceptual countermeasures
• speed management