What's the functional reason for a covered bridge?
I'm guessing it is because in the 19th century, the wood treatments were crap. So, to prevent the wood from rotting, they put a tar pitch roof over it.
Maybe, or they just look nice. The Amish teens do a lot of kissing in them
That is correct. Bridges were made of timbers and the shed over them protected them from rain and water damage.
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