What precautionary measures must be taken before putting a loading crane into operation?

The precautions before operating a loading crane are essential to ensure safety and compliance with German traffic regulations.

1. Securing the vehicle against tilting with the aid of side supports is crucial because it stabilizes the vehicle while the crane is in use. The loading crane can create significant lateral forces, and without proper support, the vehicle may tip over, leading to accidents.

2. Ensuring that there are no electrical lines in the swivelling range is important to prevent electrocution hazards. If the crane inadvertently contacts electrical wires, it could result in severe injuries or fatalities.

The third option, checking whether support is absolutely necessary on the sides, is relevant but is not a primary concern compared to the other two. While it is good practice to consider all types of support, the first two are critical for direct safety during the crane's operation.

In summary, both securing the vehicle and checking for electrical lines directly relate to preventing accidents, and that's why they are emphasized in the regulations.