Abstract: The supporting device for signal transmitters includes a first flat supporting frame, which may preferably be attached in parallel to a ceiling of a tunnel, and a second flat supporting frame adapted to accommodate signal transmitters, wherein the second supporting frame is pivotally connectable to the first supporting frame at a first end of the supporting device via first connecting means, and is detachably fixable to the first supporting frame at a second end of the supporting device via second connecting means.

Abstract: A modular display device for optical signals includes a supporting frame and a plurality of display modules each having a module housing and a plurality of light emitting diodes integrated therein. The module housings are inserted into the supporting frame and are releasably attached thereto. The attachment of the module housings in the supporting frame is implemented by movable snap-in locking members that are structured for engaging respective holding elements disposed on at least two opposing side walls of each module housing. The snap-in locking members of adjacent side walls of different module housings are arranged to be offset with respect to each other.

Abstract: An optical display device for the representation of signs, especially road signs, in a display frame attached to a support device. The display frame is comprised of strip-shape display segments located at a distance from each other. In order to obtain a small-sized display device perpendicular to the direction in which an observer moves, the support device is aligned in a substantially parallel position to the given direction in which the observer moves, and the display frame is designed to include several display segments, located at a distance from each other, placed behind each other in the direction of movement and corresponding to the chronological order in which the sign is to be represented. The display segments are substantially parallel to the surface normals of the support device for the display frame or inclined at an angle of less than 45.degree. to the surface normals and assigned opposite the sightline of the observer.