National Academies Press: OpenBook

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

Chapter: Annex A - Design Examples

« Previous: References
Page 70
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
Page 80
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 80
Page 81
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 81
Page 82
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 82
Page 83
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 83
Page 84
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 84

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

70 Design Examples A N N E X A 71 Freeway Design Example Using AASHTO GL-7 and SSL Guideline 78 Street Design Example Using AASHTO GL-7 and SSL Guideline

Design Examples 71 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 Electric and lighting management systems 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.

72 Solid-State Roadway Lighting Design Step 2c – Determine warranting conditions. 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 Guidance 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.

Design Examples 73 Step 2e – Determine design levels. Example Result: Using Table 3-5a for Interstate and other freeways. Step 2f – SSL consideration. Example Result: Project master plan requires SSL.

74 Solid-State Roadway Lighting Design Step 2g – Determine levels for adaptive lighting. Example Result: Class H3, using FHWA-HRT-14-050, Guidelines for the Implementation of Reduced Lighting on Roadways, which would not allow for this system to be dimmed. Step 2h – Source color selection. Example Result: Based on the research provided in the SSL Guidance, a 4000K CCT LED source will be used. Step 2i – Consider the surround ratio as part of design. Example Result: The surround ratio will be included: SR = 0.8 Figure 19 - Example Diagram for Applying Surround Ratio

Design Examples 75 Step 3. Maintenance Considerations in Roadway Lighting Design Step 3a – Select appropriate maintenance factors for luminaire dirt depreciation (LDD), lamp lumen depreciation (LLD), and luminaire ambient temperature factor (LATF) to apply a total light loss factor (LLF) to the lighting design. Example Result: SSL specific maintenance factors are LDD = 0.9, LLD = 0.82, and LATF = 1; then LLF = 0.738. Step 4. Sky Glow, Trespass, Environmental Impacts Step 4a – Determine lighting zone. Example Result: LZ2 Step 4b – Determine mitigation of sky glow and trespass Example Result: Maximum illuminance 0.3 fc.

76 Solid-State Roadway Lighting Design FREEWAY PARAMETERS FREEWAY DESIGN

Design Examples 77 FREEWAY LIGHTING CALCULATION

78 Solid-State Roadway Lighting Design 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 Electric and lighting management systems 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

Design Examples 79 Step 2c – Determine warranting conditions. Example Result: Warranting conditions applied from the SSL Guidance for crash modification factors (CMF) suggest 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.

80 Solid-State Roadway Lighting Design Step 2e – Determine design levels. Example Result: Using Table 3-5a for Interstate and other freeways. Step 2f – SSL consideration. Example Results: Project master plan requires SSL.

Design Examples 81 Step 2g – Determine levels for adaptive lighting. Example Results: Using IES RP-8-18, Chapter 11, “Lighting Design Criterial for Streets,” the lighting can be dimmed when the pedestrian activity falls from a medium to a low classification. Step 2h – Source color selection. Example Results: Based on the research provided in the SSL Guidance a 4000K CCT LED source will be used. Step 2i – Design to sidewalk illumination levels and consider surround ratio as part of design. Example Results: Sidewalk levels and surround ratio will be evaluated. Figure 19 - Example Diagram for Applying Surround Ratio Lmax: Maximum pavement luminance LV,max: Maximum veiling luminance Lavg: Maintained average pavement luminance Lmin: Minimum pavement luminance

82 Solid-State Roadway Lighting Design Step 3. Maintenance Considerations in Roadway Lighting Design Step 3a – Select appropriate maintenance factors for luminaire dirt depreciation (LDD), lamp lumen depreciation (LLD), and luminaire ambient temperature factor (LATF) to apply a total light loss factor (LLF) to the lighting design. Example Results: SSL specific maintenance factors are LDD = 0.9, LLD = 0.9, LATF = 1; then LLF = 0.81 Step 4. Sky Glow, Trespass, Environments Impacts Step 4a – Determine lighting zone. Example Result: LZ3 Step 4b – Determine mitigation of sky glow and trespass. Example Result: Maximum illuminance 0.8 fc.

Design Examples 83 STREET PARAMETERS STREET DESIGN

84 Solid-State Roadway Lighting Design STREET LIGHTING CALCULATION

Next: Annex B - Solid-State Lighting Sample Specifications »
Solid-State Roadway Lighting Design Guide: Volume 1: Guidance Get This Book
×
MyNAP members save 10% online.
Login or Register to save!
Download Free PDF

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.

  1. ×

    Welcome to OpenBook!

    You're looking at OpenBook, NAP.edu's online reading room since 1999. Based on feedback from you, our users, we've made some improvements that make it easier than ever to read thousands of publications on our website.

    Do you want to take a quick tour of the OpenBook's features?

    No Thanks Take a Tour »
  2. ×

    Show this book's table of contents, where you can jump to any chapter by name.

    « Back Next »
  3. ×

    ...or use these buttons to go back to the previous chapter or skip to the next one.

    « Back Next »
  4. ×

    Jump up to the previous page or down to the next one. Also, you can type in a page number and press Enter to go directly to that page in the book.

    « Back Next »
  5. ×

    To search the entire text of this book, type in your search term here and press Enter.

    « Back Next »
  6. ×

    Share a link to this book page on your preferred social network or via email.

    « Back Next »
  7. ×

    View our suggested citation for this chapter.

    « Back Next »
  8. ×

    Ready to take your reading offline? Click here to buy this book in print or download it as a free PDF, if available.

    « Back Next »
Stay Connected!