Lighting levels for isolated intersections : leading to safety improvements : final report.
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Lighting levels for isolated intersections : leading to safety improvements : final report.

Filetype[PDF-1.12 MB]

  • English

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      Final report
    • Abstract:
      A number of studies have linked the benefits of roadway lighting to a reduction in crash rates at night for a variety

      of roadway types including rural intersections. Assessing the effectiveness of intersection lighting has primarily

      relied upon crash database modeling comparing lighted intersections to unlighted intersections. The current

      research effort gathered similar metrics for comparison but also measured the amount of lighting within isolated

      rural intersections. Sixty-three intersection locations were chosen for lighting measurement from six different

      counties within Minnesota. A vehicle mounted illuminance meter data collection system was used to collect data at

      each intersection. The data collection system utilized five separate illuminance meters and captured horizontal

      illuminance while driving through all 63 intersection locations. Following data collection, a series of negative

      binomial regression models were used to assess the horizontal lighting level in conjunction with the nighttime crash

      ratio, intersection configuration type, and proximity of an intersection to a curve in the roadway. The first model

      used data from the lighted an unlighted intersections. The results showed that across all intersections, an increase in

      the average horizontal illuminance (3.91 lux) by 1-lux (~0.09 fc) reduced nighttime crash rates by 9%. A second

      model used only lighted intersection data and showed an increase in 1-lux from average (6.41 lux) reduced crashes

      by 20%. A third and final model used unlighted intersections only. A 1-lux increase from average (0.20 lux) or

      increasing illuminance to lighted levels (as defined by the modeling), reduced nighttime crash ratios by 94%.

      Intersection configuration and proximity to curves also affected the nighttime crash ratios. The results of this effort

      are discussed in terms the impact of horizontal illuminance on crash rates. Additional items discussed include

      thresholds for minimum and maximum lighting levels and future research investigating and validating these efforts.

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