Self explanatory question, but..

I guess if there’s something to say here it would be just some layman think. I guess tunnels are closer to the ground and therefore don’t have to support the weight of heavy cars in the same way a bridge does. That might be one advantage if that’s true.

Then again, tunnels have to deal with huge volumes of water constantly pushing down on them.

Bridges seem like less trouble to possibly repair, since they are exposed, and you can kinda see what’s going on just by taking a look.

I really have no clue. I guess it comes down to cost effectiveness.

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