National Academies Press: OpenBook

Solid-State Roadway Lighting Design Guide: Volume 1: Guidance (2020)

Chapter: Chapter 8 - Safety Rest Areas

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Page 40
Suggested Citation:"Chapter 8 - Safety Rest Areas." National Academies of Sciences, Engineering, and Medicine. 2020. Solid-State Roadway Lighting Design Guide: Volume 1: Guidance. Washington, DC: The National Academies Press. doi: 10.17226/25678.
Page 40

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40 Safety Rest Areas Current Guide The current AASHTO Roadway Lighting Design Guide (AASHTO 2018) discusses safety rest areas and gives recommendations for lighting levels within the rest area, on entrance roads, and in parking areas. Requirements for minimizing glare are also included in the guide. Additional Considerations for LED Sources The lighting levels with safety rest areas would not be modified on the basis of the use of LEDs. Following are some considerations that might be useful: • Consideration of adaptive lighting at these facilities is suggested, with dimming occurring when activity is reduced. Dimming could occur on the basis of the lighting level for major activities versus that for minor activities. Roadway and gore areas should be dimmed to the same levels as the mainline roadway lighting. Motion sensors for public areas off the roadway may be considered. The use of dimming, however, must be specific to the area, DOT preferences, expected use, and security concerns for the area. • Various CCT sources could be used to delineate areas within the rest area (e.g., vending, pedestrian paths) to assist in identification and wayfinding. • Glare should be limited to the mainline roadway so that the driver on the mainline does not see an increase in the veiling luminance ratio prescribed in the current AASHTO guide. Key Issues for Safety Rest Areas • Consider adaptive lighting for safety rest areas if deemed appropriate by the owner. • Consider pedestrian and vehicle flow as part of the design. • Assess and design to mitigate any glare to the mainline roadway. C H A P T E R 8

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The lighting industry has changed dramatically over the past decade. The optical system design of legacy high-intensity discharge (HID) luminaires was restricted to the lamp, refractor, and reflector design, which had limits in the distribution of the light, controls, and adaptability. Roadway luminaires have moved beyond this design methodology to include the vast possibilities presented by solid-state lighting (SSL). At present, in the form of light emitting diodes (LED), SSL uses lower energy, reduces maintenance, improves color, and can be easily dimmed and controlled.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 940: Solid-State Roadway Lighting Design Guide: Volume 1: Guidance develops more comprehensive guidelines in American Association of State Highway Transportation Officials (AASHTO)-standard format for the application of roadway lighting related to the widespread adoption of SSL, and identifies gaps in knowledge where possible future research will enhance these guidelines.

Also see this guide's accompanying report, NCHRP Research Report 940: Solid-State Roadway Lighting Design Guide: Volume 2: Research Overview.

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