Breakthroughs in Vision and Visibility for Highway Safety: Workshop Summary Report, August 13-14, 2014

McInnis, Catherine; Morton, Tom · 2015 · ROSA P / United States. Federal Highway Administration. Office of Safety Research and Development

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Summary

This report summarizes a two-day workshop convened by the Federal Highway Administration (FHWA) in August 2014 to identify research gaps and future directions in highway visibility and vision safety. The workshop was motivated by the observation that while significant research had been conducted on visibility issues such as retroreflectivity and pavement markings, this work was tapering off. Furthermore, existing research largely focused on the energy sector or vehicle-side technologies, leaving a gap in understanding how advances in sight and cognition apply to transportation infrastructure. The goal was to determine the FHWA’s role in advancing this field and to brainstorm innovative tools to bridge the gap between current practices and future technologies, including full vehicle automation. The workshop featured presentations from five experts covering roadway lighting, retroreflectivity, future vehicle technologies, edge detection frameworks, and human visual systems. Dr. Ron Gibbons discussed adaptive lighting systems, noting that shifting to blue-spectrum LED lighting could maintain visibility while reducing energy consumption, though more data is needed to confirm crash rate impacts. Dr. Paul Carlson reviewed retroreflectivity research, highlighting the need for updated standards in the Manual on Uniform Traffic Control Devices (MUTCD) regarding sign brightness and pavement marking performance. Dr. Michel Ferreira explored virtual windshields and vehicle-to-vehicle connectivity, warning that augmented reality could create false senses of safety or information overload. Dr. Nicolas Hautière presented a contrast sensitivity model for edge detection in poor weather, validated by human subject testing. Dr. Eileen Kowler examined eye-movement analysis, finding that drivers often fail to visually explore complex environments due to cognitive effort constraints, leading to increased errors. Key findings from panel discussions and breakout sessions identified critical research needs. Participants emphasized the necessity of revisiting visibility standards for new technologies like head-up displays and virtual windshields, which may reduce peripheral vision and increase information workload. There is a specific need to study driver decision-making processes under low visibility and to understand how active safety technologies, such as adaptive cruise control, affect risk assessment. The report highlights a gap in understanding individual differences, particularly among older drivers and those with attention deficits, and the need to define nighttime visibility metrics distinct from daytime conditions. Additionally, participants noted the importance of coordinating research across disciplines and agencies to create a clearinghouse for visibility data and to determine whether investments in dimmable lighting or pavement maintenance offer better safety returns. The significance of this report lies in its roadmap for future highway safety research. It concludes that current infrastructure systems are not sufficiently interconnected and that visibility standards must evolve to accommodate smart vehicles and automated systems. The workshop underscores the need for systematic approaches to nighttime visibility, better definitions of sign clutter, and rigorous human factors research to ensure that emerging technologies enhance rather than compromise safety. By identifying these gaps, the report guides the FHWA and other stakeholders in prioritizing exploratory and applied research to support the transition toward fully automated transportation systems.

Key finding

The workshop identified critical research gaps in highway visibility, specifically regarding the need to update standards for emerging technologies like virtual windshields and adaptive lighting, and to better understand the interaction between driver cognition, environmental visibility, and smart vehicle systems.

Methodology

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Provenance

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Topics

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• visibility analysis litigation
• roadway lighting effects
• emergency work zone conspicuity
• vehicle conspicuity
• visual occlusion
• motorcycle conspicuity

Information type

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• Methodological Resource: tool software, dataset resource
• Synthesis & Review: research agenda