Which of the following is required to transport a load that exceeds the permissible length?

The requirement for transporting a load that exceeds the permissible length is that it must be marked with signs. This is crucial for safety and visibility on the road. Marking the load with signs alerts other road users that the vehicle is carrying an oversized load, preventing potential accidents and ensuring that the transport is compliant with road safety regulations.

Loads exceeding certain dimensions can pose hazards, especially if they obscure the driver's view or extend into lanes designated for other vehicles. Proper signage serves as a warning and provides crucial information to other drivers, thereby facilitating safer navigation around the oversized vehicle.

In addition, while a special permit is often required for extended loads, the marking, as the correct answer emphasizes, is an immediate and essential safety measure. It indicates awareness of the load's size and communicates necessary precautions to others, making it an important part of the transportation of oversized loads.