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Tunnel lighting design procedures

Author: Vincent P Gallagher; United States. Federal Highway Administration. Office of Implementation.; Design-Eye Group.
Publisher: McLean, VA : Federal Highway Administration, Office of Implementation ; Springfield, VA : National Technical Information Service, [1985]
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
Tunnels commonly create bottlenecks in traffic flow because of a change in cross-sectional width and a discontinuing of road shoulders past the portal. The effect of these restrictions can be congestion and high accident rates unless an adequate lighting system is provided to reveal the locations of walls and curbings. The problem is most accute in daytime, when drivers make the transition from a brightly  Read more...
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Additional Physical Format: Online version:
Gallagher, Vincent P.
Tunnel lighting design procedures.
McLean, VA : Federal Highway Administration, Office of Implementation ; Springfield, VA : National Technical Information Service, [1985]
(OCoLC)855520043
Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: Vincent P Gallagher; United States. Federal Highway Administration. Office of Implementation.; Design-Eye Group.
OCLC Number: 12929208
Notes: Cover title.
Performing organization: Design-Eye Group.
"June 1985."
Description: iii, 26 pages ; 28 cm
Contents: Introduction --
Tunnel traffic operations --
Tunnel lighting zones --
Tunnel lighting design procedures --
References --
Appendix A: Calculation of veiling luminance --
Appendix B: Research and theoretical background --
Appendix C: Current recommendations.
Responsibility: [Vincent P. Gallagher].

Abstract:

Tunnels commonly create bottlenecks in traffic flow because of a change in cross-sectional width and a discontinuing of road shoulders past the portal. The effect of these restrictions can be congestion and high accident rates unless an adequate lighting system is provided to reveal the locations of walls and curbings. The problem is most accute in daytime, when drivers make the transition from a brightly illuminated exterior roadway to the tunnel interior with a much lower luminance level. To facilitate the design of a lighting installation which will allow for this transition, it is convenient to consider tunnels as being made up of 5 zones: 1) the approach zone, 2) the threshold zone, 3) the transition zone, 4) the interior zone, and 5) the exit zone. Each of these zones has specific lighting levels and lengths depending on the tunnel wall materials, tunnel dimensions, wall color, portal landscaping, and traffic characteristics. Luminance requirements can vary from 100 fL to 250 fL depending on the tunnel orientation with the sun.

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