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From page 30...
... 30 The information-gathering activities (literature review and transportation agency survey) undertaken for this project have led to the following conclusions about the practice of lighting for isolated rural intersections in the United States: • The literature review and statements of the DOTs participating in the survey suggest that isolated rural intersection lighting has a meaningful safety benefit overall, but specifics on what types of intersections most benefit from lighting and what types of crashes are most impacted by lighting are not understood well.
From page 31...
... Conclusions, Knowledge Gaps, and Research Needs 31 Given the lack of implementation of adaptive lighting strategies at isolated rural intersections, further research to better understand the potential benefits of adaptive lighting could be useful to agencies. There is consistency among the responses in Figure 27 about warranting criteria and understanding the benefits of isolated rural intersection lighting and the responses to previous questions in Figures 23 through 26 about state DOT understanding of the expected economic impact from improved safety at these locations.
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