Having driven a long haul big truck for 5 years I can tell you that the driver of that bus could well be charged with manslaughter.
Yep, you’ve gotta be aware of your height and all bridges are posted with clearance requirements. If you are taller then the posted clearance, gotta find a way to turn back somehow. It beats pealing off the top of your bus and killing your passengers. I can only imagine the horrific injuries of those poor people. What a terrible tragedy.