Variable luminosity screen especially for tunnel head - comprises trellised boards extending from tunnel roof and vertical concave screen wall extending tunnel exit wall

摘要

The solar screen continues from the right of the tunnel (2) to the junction (3) with the link road (4). The roof of the tunnel (2) is extended by a screen structure (5) which supports trellised boards (6) to create a shade. The shade luminosity gradient varies from the weakest, on leaving the tunnel, and the strongest , the more the screen structure (5) is distanced from the tunnel. One of the tunnel walls is extended on the right by a concave vertical screen wall (7) whose height decreases the more it is distanced from the tunnel (2). The wall (7) acts as a transparent luminous and phonic screen. USE - Provision of variable luminosity gradient at motorway tunnel exits.