New Approaches for Roundabout Lighting to Enhance Pedestrian Safety

Roundabouts are rapidly gaining in popularity as an intersection treatment across the United States. As the number of roundabouts in Minnesota continues to grow, local road authorities are interested in new approaches to roundabout lighting to enhance pedestrian safety while reducing ongoing energy costs. One emerging approach is ecoluminance, a lighting concept that incorporates light reflected from plants, low-height bollard-based lighting, and retroreflective elements to light roundabouts while reducing power consumption. The Local Road Research Board (LRRB) was interested in more information about this and other approaches to lighting roundabouts effectively but efficiently to improve pedestrian safety, and more generally in a synthesis of information that could serve as a starting point for review of several topics in roundabout lighting. These topics include: Current design standards and best practices for roundabout lighting to enhance pedestrian safety; The role of lighting in enhancing the visibility and safety of pedestrians at roundabouts; The impacts of lighting placement, height and fixture type, particularly low-height fixtures (such as bollards that are a few feet tall, rather than mounted overhead); Energy considerations related to lighting systems, including the incorporation of ecoluminance elements; and Challenges related to maintenance of lighting systems and equipment durability, especially during the winter. To gather this information, CTC & Associates conducted a literature search to identify design guidance, research and best practices. They also conducted interviews with researchers and practitioners who have extensive experience in this area. While many state and local agencies offer guidelines or policies on roundabout design, most of these guides do not offer unique guidelines for lighting but instead cite federal guidance or the Illuminating Engineering Society's "Design Guide for Roundabout Lighting." The state and local guidelines cited in this report offer additional lighting guidance unique to their own agencies.


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  • Accession Number: 01600673
  • Record Type: Publication
  • Created Date: May 25 2016 10:20AM