BS 5489-7:1992

Committees responsible
Foreword
Code of practice
1. Scope
2. Definitions
3. General
4. Basis of design and summary of design procedure
5. Determination of the access zone luminance (L20)
6. Threshold zone lighting during daylight
7. Extent of threshold zone
8. Transition zone lighting during daylight
9. Interior zone lighting during daylight
10. Exit zone lighting during daylight
11. Daytime uniformity ratio of luminance
12. Lighting during the night
13. Transition between day and night lighting
14. Avoidance of flicker effects
15. Lighting of short tunnels
16. Lighting the walls and ceilings
17. Achievement of required lighting levels (including
     emergency lighting)
18. Maintenance
19. Effect of traffic fumes and haze
Appendices
A. Theoretical background to the basis of tunnel
    lighting design
B. Method of making direct measurements of access zone
    luminance on site
C. Determining access zone luminance by the grid method
D. Example of tunnel lighting design
E. Calculation of interreflected light in a tunnel
Tables
1. Stopping sight distances (SSD) for various design
    speeds
2. Values of the factor k
3. Location of the adaptation point (A)
4. Luminance in the interior zone
5. Lighting requirements for traffic routes
6. Typical luminance values
7. Example of calculation for determining access zone
    luminance L20
8. Possible values for transition, interior and exit
    zones
9. Calculated spacing for twin lamp luminaires
10. Calculation of threshold, transition and exit zones
11. Rows and spacing for each zone
12. Calculation of stage switching
13. Interreflected illuminance contributions
Figures
1. Longitudinal cross section of one-way tunnel
2. Relationship between luminances in the access zone
    and in the tunnel zones
3. Luminance reduction curves for the transition zone
4. Examples of tunnel approaches giving access zone
    luminances to be used
5. Geometric method used to locate the adaptation
    point (A) in the absence of site luminance readings
6. Effect of tunnel length on luminaire spacings to be
    avoided with regard to disturbing flicker (shaded
    areas)
7. View of a short tunnel showing the dark frame
8. Daytime lighting of short tunnels
9. Perspective view of tunnel entrance with super-
    imposed 20 deg subtense circle
10. 20 deg field of view divided into assessment areas
11. Tunnel lighting arrangement
12. Luminance levels plotted on reduction curve for
    stage 6
13. Calculation of interreflected light at point P