Any suggestions...

[Gatt]

... as to how the hell this happened/

BBC News Scotland

[webman]

Hehe, crazy!

I can only guess the truck driver raised it while driving - accidentally or on purpose I have no idea!

[ChrisC]

Surely there would be some automated system to not allow that, gust of wind lifting it? I really don't know!

Chris

[_Bat_]

My gosh... I wish my grandad was still alive, he'd be able to tell me exactly how it was done (he was the head lorry driver of a large firm and had to have a police escort half the time because the ones he drove were huge).