The lighting designs of tunnels, in both existing and new installations, are based on previous practical experience combined with some theoretical studies. Evacuation lighting is chosen from products commercially available on the market. Ongoing technological developments in the lighting industry, however, may provide possibilities which designers of new installations should take advantage of. When retrofitting an existing installation, a cost/benefit evaluation will reveal which actions should be taken. Lighting technology is developing quite rapidly and creating new possibilities. The relevant national regulations may not keep up with these developments and may not necessarily promote best use of commercially available equipment. At the same time, it is not always true that “more is better” in the world of lighting. This study of currently available evacuation lighting is an important input for ongoing and upcoming revisions of road authority guidelines. The Norwegian and Swedish road authorities, with financial support from Nord FoU, conducted tests for studying evacuation lighting in tunnels and their visibility in smoke conditions. The purpose was not to test specific products, but to study the general visibility of different lighting solutions and evaluate the appropriate design for evacuation lighting.