Investigation Of Alternative Displays For Side Collision Avoidance Systems, Final Report

NHTSA · 1996 · ROSA P / United States. Joint Program Office for Intelligent Transportation Systems

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Summary

This 1996 report by the National Highway Traffic Safety Administration (NHTSA) addresses the critical need for effective Driver-Vehicle Interface (DVI) designs for Side Object Detection Systems (SODS). SODS are a subset of Side Collision Avoidance Systems designed to warn drivers of adjacent vehicles, particularly during lane changes and merging maneuvers. The study was motivated by the high frequency of angle and sideswipe collisions, which accounted for over 41% of total crashes in 1993 data. While sensor technologies for these systems were advancing, there was a significant lack of knowledge regarding how drivers perceive, understand, and respond to warning information. The research aimed to identify DVI characteristics—such as alert modality, location, symbology, and color—that enhance driver acceptance and ensure correct responses. The study employed a mixed-methods approach using static mock-ups and a driving simulator to evaluate a wide range of alternative SODS DVI designs. Participants were exposed to various alert configurations, including auditory, visual, and tactile modalities, across different display locations such as the driver side, passenger side, rear-view mirror, and dash panel. The experimental design assessed driver preferences and responses under specific scenarios, distinguishing between "no intent to turn" situations and "intent to turn" situations. Key variables included the format of the alert, its dynamic properties, and the presence of status indicators at vehicle start-up. The researchers analyzed dependent variables related to driver preference, comprehension, and the perceived value of the information provided. The findings identified three types of information as valuable to drivers: a status indication at vehicle start-up, a caution alert for situations with no intent to turn, and a hazard alert for situations with an intent to turn. Regarding alert design for "intent to turn" scenarios, specific visual designs were preferred: the "Vehicle in Blind Spot," "Prescriptive Arrow," and "Descriptive Car Crash" designs. These alerts were most effective when presented in red and accompanied by an auditory tone. The preference for these designs was attributed to their ability to provide clear directional information about the location of the potential threat. The study also highlighted that auditory alerts, while attention-getting, risk annoyance if false alarms are frequent, whereas visual alerts must not overload the driver’s visual scanning tasks. The significance of this research lies in establishing preliminary human factors guidelines for the design of collision avoidance warnings. The report concludes that alerts providing directional cues are superior for driver preference and likely for response accuracy. It emphasizes the importance of stimulus-response compatibility, ensuring that the alert’s location and design align with the driver’s expected actions. The findings suggest that future research should investigate these preferred alert designs under more representative driving conditions. By defining optimal DVI characteristics, the study aims to improve driver trust and system effectiveness, ultimately reducing the incidence of side-collision crashes. The report serves as a foundational reference for automotive manufacturers and safety regulators developing next-generation blind-spot detection technologies.

Key finding

Vehicle in Blind Spot, Prescriptive Arrow, and Descriptive Car Crash designs in red, accompanied by a tone, were preferred by drivers for intent-to-turn situations because they provided directional information about the potential threat.

Methodology

simulator

Provenance

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Topics

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• auditory warnings
• ehmi external hmi
• hud ar windshield
• feedback modes
• haptic feedback
• vru facing ehmi

Information type

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• Applied Guidance: design guidelines