This part of BS 5489 gives recommendations for the design of the lighting of tunnels for motorized and mixed traffic. It is applicable to all types of road, including motorways.

This standard is applicable to those aspects of lighting that are concerned with traffic safety, such as arrangements, levels and other parameters including daylight.

This standard is not applicable to aspects of lighting that concern aesthetics. This part of BS 5489 is not applicable to the lighting of underpasses or subways reserved for pedestrians or cyclists, which is covered in BS 5489‑1.