Abstract
The present report deals with a limited number of questions, which were judged to be either the most important or of the most current interest, amongst those which face tunnel designers. These questions, numbering six, concern: firstly, the geometric characteristics of tunnels; the three following concern problems relating to fitting out highway tunnels (pollution, ventilation, lighting); the fifth deals with the operation of tunnels; the sixth with underground town planning. The "revue generales des routes" april 1976, no 519, pp 56-59, contains an article which describes in turn: the introductory report of the president and the report of each working party. For the covering abstract see IRRD abstract no 104484.