....other than driving without due care and attention, I don't see any other sections of the MVA that would apply.....
But this would be easily arguable that signage is not adequate. All tho there are multiple signs ON the bridge, there is only one sign, just at bonnacord street, that say trucks prohibited and to turn left, then next sign is left turn prohibited....and by the time you see that first height sign 75 feet before the bridge....try stopping a loaded 53 footer at 45-50 km\h with reaction time... good luck.....but by looking at the picture, he has realized too late and could not stop in time...has he had not noticed at all, he would have just opened the top of the trailer like a can of sardines.
All tho some fault can be blamed on the driver, signage is also a big issue, and it has been like this for many years and never corrected.....