Another more insistent approach I have seen elsewhere is to mount a large steel bar across the road, which takes the top of the truck off before they hit the bridge.
(edit:not very simple problem, obviously..)
FWIW I have read about this at length generally at a local level, living and working next to a couple of bridges with this issue. A high tech approach has been tried and abandoned with these bridges as they were (fatally) not effective (though not this high-tech). I naturally assumed there was some particular reason for the tunnel.
I read the rest of the thread before I commented, the ones you point out were written after, and they do indeed go some way toward explaining that particular issue at that particular tunnel. The original post did not explain anything but the bad road design.
While we are giving friendly advice, your comments may be better received if you gave them in a spirit of generosity, as I have taken yours, rather than jumping straight to judgements and epithets.
As an aside, i work in the software industry, and here, that is absolutely not the case at all.
I've found that approaching these with the question of "what drove them to implement such a system" leads to much more enlightenment than going from the point of "they're idiots for implementing it this way."
It's more obvious in footage from the camera located on the left side of the bridge.
Why do you think the team at the tunnel would go to such lengths and expense if there was a simple solution?
Only possibly worse, as I assume the explosion would have nowhere to go but down.
Still not remotely optimal but avoiding damage to the tunnel requiring far more blockage seems like a good tradeoff.