Assuming that it is legally binding thing with the Clackmannanshire Bridge this lorry was travelling on, can the driver be prosecuted. I would throw the book at him.
It's advisory, but because he ignored the advise, he could be prosecuted for driving without due care and attention and his company's insurers are unlikely to pay out.
It's a similar situation with the advisory speed limits on matrix signs. You can't be prosecuted for exceeding the advisory speed, but if you have accident whilst ignoring them, the police can charge you with driving without due care and attention and you insurance could be invalid.