Lighting Practices for Isolated Rural Intersections (2022) / Chapter Skim
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11 Performance Criteria for Isolated Rural Intersection Lighting To develop specifications for isolated rural intersection lighting, it is necessary to have quantitative criteria that characterize the performance of the lighting system. Survey participants were asked what criteria were used by their agencies to define lighting system performance (Figure 8)
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12 Lighting Practices for Isolated Rural Intersections • Lateral distribution types: Roadway luminaires are categorized into different lateral types denoted by Roman numerals, expressing (very roughly) how far "across" the road a luminaire emits light.
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Design Factors and Criteria 13 maintaining equivalent perceived brightness when a "white" light source like LED is used to replace a "yellowish" one like HPS. In practice, uniformity criteria are probably less likely to be met or even checked following the installation of lighting for isolated rural intersections, because such lighting is frequently installed with one or two luminaires (Bullough et al.
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14 Lighting Practices for Isolated Rural Intersections Equipment and Hardware Configurations Survey participants were asked to identify the types and configurations of lighting equipment they use at installations of lighting for isolated rural intersections (Figure 11)
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Design Factors and Criteria 15 for collisions, and even farther for high-speed roads. New Hampshire DOT (2010)
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16 Lighting Practices for Isolated Rural Intersections survey respondents stated that the wattage needed would be minimized or dependent on the requirements of the specific location. Regarding lighting controls, almost every survey respondent selecting this option reported that they used photocells to control the lighting system on a dusk-to-dawn schedule.
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