The design is described of the tunnel power supplies, the lighting system, electrical features of the ventilation system and miscellaneous services, together with their associated control, monitoring and alarm facilities. Power will be distributed through the service area at 400/230 V from an 11,000/400 V substation near the south portal. A 50 V d.c. power supply will be distributed for control and indication purposes. Visual and audible alarms will indicate fault conditions. Carbon monoxide levels will be sensed by 3 analyzing units located in the center of the tunnel and 60 m from each portal. Overhead lane signals switched from the control center will be installed in the tunnel and over the approach zone. The tunnel lighting system involved special investigation and design. The light will be directed on the road surface but sufficient is provided on the lower surface of the highly reflective wall panels to raise their luminance to about twice the road value. Lightings for daylight operation; high pressure sodium fittings are used in the entrance zone. Three levels of boost lighting are used and automatically switched for dawn and twilight, dull day and bright day conditions. High pressure sodium fittings have light source cut off to minimize discomfort from glare. A remote alarm will alert when the lighting level falls below 70 percent of its normal value. The entire lighting system has been designed to allow alterations based on operational experience to be readily made, and conversion to a 100 km/h one-way system a relatively easy operation.

  • Availability:
  • Corporate Authors:

    Technical Publications Limited

    C.P.O. 3047
    Wellington,   New Zealand 
  • Authors:
    • Caradus, W G
  • Publication Date: 1975-8-15

Media Info

  • Features: Figures; References;
  • Pagination: p. 236-241
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00128556
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 10 1976 12:00AM