This CEN Technical Report gives guidance on the design of the lighting of road tunnels and underpasses formotorized and mixed traffic. This guidance concerns arrangements, levels and other parameters including daylight,which are related only to traffic safety. Aspects concerning visual comfort should be chosen in agreement withnational practice. The guidance in this report may be applied to any tunnel or underpass where the decision toprovide lighting has been taken by any authority working within national legislation or other constraints. The reportis based on photometric considerations, and all values of luminance and illuminance are maintained values.The main body of the report covers the common aspects of Tunnel Lighting, and the various methods currently inuse in Europe are detailed in the annexes. No single method is recommended.