This paper describes the practical application of design codes CIE88 and BS 5489 Part 7 to a huge multi-million road transport project in South Australia. The Heysen Tunnel is the key element of a new three-lane motorway linking the city of Adelaide with parts of Australia to the east. The previous route was notoriously tortuous, with a high accident rate. The Adelaide-Craters Freeway project to build the new road began in early 1997, with the Macmahon Walter construction joint venture undertaking the works, Transport SA (the South Australian state Government's Department of Transport) providing overall project management, and the Australian Federal Government financing it. The two bores of the Heysen tunnel are each 485m long, and have 544 luminaires with high pressure sodium lamps altogether. The paper covers the following topics: (1) a review of the tunnel services; (2) a review of the tunnel's lighting; (3) terminology; (4) the tunnel lighting design procedure; (5) the derivation of the access zone luminance (L20); (6) the K factor, which relates the derived L20 value to the luminance factor required in the threshold zone; (7) the avoidance of `flicker'; (8) the `counter beam' approach; (9) the five types of luminaire used; and (10) the road lighting switching and control.
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