National Academies Press: OpenBook

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

Chapter: Annex A Design Examples

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Page 67
Suggested Citation:"Annex A Design Examples." 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.
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Page 68
Suggested Citation:"Annex A Design Examples." 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.
×
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Page 69
Suggested Citation:"Annex A Design Examples." 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.
×
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Suggested Citation:"Annex A Design Examples." 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 70
Page 71
Suggested Citation:"Annex A Design Examples." 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 71
Page 72
Suggested Citation:"Annex A Design Examples." 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 72
Page 73
Suggested Citation:"Annex A Design Examples." 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 73
Page 74
Suggested Citation:"Annex A Design Examples." 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 74
Page 75
Suggested Citation:"Annex A Design Examples." 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 75
Page 76
Suggested Citation:"Annex A Design Examples." 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 76
Page 77
Suggested Citation:"Annex A Design Examples." 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 77
Page 78
Suggested Citation:"Annex A Design Examples." 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 78
Page 79
Suggested Citation:"Annex A Design Examples." 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 79

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Annex A – Design Examples Freeway Example Street Example

A-1 Freeway Design Example using AASHTO GL-7 and SSL Guideline Step 1 – Develop a Master Lighting Plan Example Result: Create a formal arrangement between the local governments and other entities within the regional area to coordinate and standardize the design, operation, and maintenance of the public lighting. Include curfews and monitoring and control systems. o Coordination with agency and set goals • 45 FT mounting height restriction with 8 FT arm Max length o Curfews o ELMS o Conduct applicable studies o SSL Considerations:  Determine Adaptive Lighting technology  Determine Smart City needs  Selection of luminaires to meet goals  Standardize  O&M limitations  Environmental Sensitivity Step 2 – Lighting Design Step 2a - Determine Illuminance or Luminance Design Example Result: Both Illuminance and Luminance will be used for freeway calculations. Step 2b – Determine the road surface classification to properly design a roadway lighting system. Example Result: Asphalt, Class R3 Step 2c – Determine Warranting conditions

A-2 Example Result: Warranting condition, sections in and near cities where the current average daily traffic (ADT) is 30,000 or greater, CFL-1. Warranting conditions can also be applied from the SSL Guideline for crash modification factors. Lighting was decided to be added. Step 2d – Pole placement Example Result: Existing lighting locations in center median, new lighting system will utilize existing duct bank. Therefore, light pole locations will be in the center median. Step 2e – Determine design levels Example Result: Using Table 3-5a for Interstate and other freeways Step 2e - SSL Consideration Example Results: Project Master Plan requires SSL Step 2f - Determine Levels for Adaptive lighting

A-3 Example Results: Class H3, using the FHWA Adaptive Lighting Guidelines which would not allow for this system to be dimmed. Step 2e - Source color selection Example Results: Based on the research provided in the SSL Guideline a 4000K CCT LED source will be used. Step 2g - Consider SR as part of design Example Results: Surround ratio will be included SR = 0.8 Step 3 – Maintenance Considerations in Roadway Lighting Design Step 3a – Select appropriate Maintenance Factors for Luminaire Dirt Depreciation, Lamp Lumen Depreciation, and Luminaire Ambient Temperature Factor to apply a total Light Loss Factor to the lighting design. Example Results: SSL specific Maintenance Factors LDD: 0.9, LLD: 0.82, LATF:1 = LLF .738 Step 4 – Sky Glow, Trespass, Environments Impacts

A-4 Step 4a - Determine Lighting zone Example Result: LZ2 Step 4b - Determine mitigation of sky glow and trespass Example Result: Maximum Illuminance 0.3 fc

A-5 FREEWAY PARAMETERS FREEWAY DESIGN

A-6 FREEWAY LIGHTING CALCULATION

A-7 Street Design Example using AASHTO GL-7 and SSL Guideline Step 1 – Develop a Master Lighting Plan Example Result: Create a formal arrangement between the local governments and other entities within the regional area to coordinate and standardize the design, operation, and maintenance of the public lighting. Include curfews and monitoring and control systems. o Coordination with agency and set goals  35 FT mounting height restriction with 6 FT arm Max length o Curfews o ELMS o Conduct applicable studies o SSL Considerations:  Determine Adaptive Lighting technology  Determine Smart City needs  Selection of luminaires to meet goals  Standardize  O&M limitations  Environmental Sensitivity Step 2 – Lighting Design Step 2a - Determine Illuminance or Luminance Design Example Result: Both Illuminance and Luminance will be used for freeway calculations. Step 2b – Determine the road surface classification to properly design a roadway lighting system. Example Result: Asphalt, Class R3 Step 2c – Determine Warranting conditions

A-8 Example Result: Warranting conditions applied from the SSL Guideline for crash modification factors (CMF) suggests that if the street is previously unlit then a CMF of 0.72 can be used. Step 2d – Pole placement Example Result: The new lighting system will be illuminated from the westbound shoulder. Step 2e – Determine design levels Example Result: Using Table 3-5a for Interstate and other freeways Step 2e - SSL Consideration Example Results: Project Master Plan requires SSL Step 2f - Determine Levels for Adaptive lighting

A-9 Example Results: Using IES RP-8-18 Chapter 11 Lighting Design Criterial for Streets, the lighting can be dimmed down when the pedestrian activity falls from a medium to a low classification. Step 2e - Source color selection Example Results: Based on the research provided in the SSL Guideline a 4000K CCT LED source will be used. Step 2g – Design to sidewalk illumination levels and consider SR as part of design Example Results: Sidewalk levels and Surround ratio will be evaluated Step 3 – Maintenance Considerations in Roadway Lighting Design Step 3a – Select appropriate Maintenance Factors for Luminaire Dirt Depreciation, Lamp Lumen Depreciation, and Luminaire Ambient Temperature Factor to apply a total Light Loss Factor to the lighting design. Example Results: SSL specific Maintenance Factors LDD: 0.9, LLD: 0.9, LATF: 1 = LLF .81 Step 4 – Sky Glow, Trespass, Environments Impacts

A-10 Step 4a - Determine Lighting zone Example Result: LZ3 Step 4b - Determine mitigation of sky glow and trespass Example Result: Maximum Illuminance 0.8 fc

A-11 STREET PARAMETERS STREET DESIGN

A-12 STREET LIGHTING CALCULATION

Next: Annex B Solid State Lighting Sample Specifications »
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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 pre-publication draft of 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 pre-publication draft, NCHRP Research Report 940: Solid-State Roadway Lighting Design Guide: Volume 2: Research Overview.

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