In April 2021, the height control at structure 28 - Prüfening Tunnel - on the BAB 93 was activated. Prior to this, there was a test run with representatives of the responsible road traffic authority, the traffic and operations centre, the motorway maintenance department and the traffic police. We have created a picture documentation of this test activation. It shows both the triggering in front of the structure and on the monitors in the operations building. The photos are used for internal (also training purposes) at the Autobahn GmbH des Bundes Niederlassung Südbayern and at the traffic police Regensburg. In addition, some pictures were sent to regional media for external communication purposes as part of a press release.