The study area, Ekeberg/Gamle Oslo, is an urban area centrally located in Oslo. The construction of new main roads in tunnels is expected to relieve the area of some of the negative environmental impacts caused by large traffic volumes. Several before and after studies serve to describe the changes. This working report gives an overview of the data collection connected to investigations in the area autumn 1994. The study includes traffic counts, a survey among 1074 residents and noise and pollution estimations. The report also describes the establishment of a common database.