About disturbance considerations for retention walls.

Hi everyone: I have a Project that needs to have large retention walls close to the office and main acces road. Therefore, we have staggered concrete retention walls confining the construction área. So we have one just confining the walkway, then a planing área of 2-3m and then another smaller one, then planting área 2-3 m and so on. In the points where there are more walls there are 6 staggered walls. Those are needed to provide structural security to the Project work. To define the impact área according to the SSc5.1, I'm assuming that those walls are part of the main road footprint, (even if they are not really a road, but part of its structure) and therefore giving and offset of 4.5 m of posible construction impact. Is that approach is right?