This AFAIK is a similar Volvo chassis to the Megabus involved. The driver has virtually zero protection and in some designs the strongest part of the structure is a sheet of blockboard or ply. The only real strength is at cant rail level.
businesstoday.com.my/2022/0 … -malaysia/
The RT cab is actually wooden framed .
youtube.com/watch?v=WmegPOl9hSE&t=87s
Having given up in frustration because of the site continually cutting out, finally 9 hours later it allowed me to edit the post with the correct limk.