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The gas tank on top of a bus in Stockholm exploded when the bus was about to enter a tunnel protected by a metal bar: https://youtu.be/4pVStENP_Y4

I mean, that sucks, but the same thing would have happened if it had entered the tunnel?

Only possibly worse, as I assume the explosion would have nowhere to go but down.

So the bar did the job of ablative armor, per se.

Still not remotely optimal but avoiding damage to the tunnel requiring far more blockage seems like a good tradeoff.