Is there a crane beam walkway only in the middle?

The walkway board of crane beam is not only in the middle, but mainly for the operation of crane and the safety of personnel. When the crane is working, it needs to move and locate in all directions. If only the walkway board is set in the middle, it will be inconvenient for the crane to work on both sides, which will affect the work efficiency. The walkway board is not only for the crane to move, but also for people to walk and work safely and conveniently on the crane. If the walkway board is only in the middle, people will face safety risks when walking on both sides.