Necessary if the vehicle is too wide. The safety switches are required if the required safety clearances according to DIN 24446 cannot be complied with on the side, in front of or behind the wash gantry. This prevents the risk of crushing. The safety switches are fastened to the wash gantry on construction frames. The system shuts down if actuated. After inspection and rectification of the problem, the system can be switched on again with the "start" button.