Roadway tunnel has ceiling which has long cavity which extends transversely to roadway, with one end of cavity open to roadway space and other end open to outside area

摘要

The roadway tunnel has a ceiling (3) which has a long cavity (6a) which extends transversely to the roadway (2), with one end of the cavity open to the roadway space (9) and the other end open to the outside area (10). The first side panelling (4) of the tunnel has window elements which can be opened, and a device for automatic opening of the window elements which responds to a predetermined signal.