Some are built to spam a shorter distance, or not make cars getting down the hill then back up it. There are a lot of factors.
Anonymous 0
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Depends on the bridge and the river, to be honest.
Some bridges are so old that they were designed to permit mastheads to pass beneath them, sails and all, at high water.
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So boats and ships can go under safely?
Anonymous 0
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Things need to be built to deal with the absolutely worst possible outcome. If there’s an extreme flood, then the bridge needs to survive, and potentially still allow people to cross during an emergency.
Also, as someone else pointed out, so that large ships can go under them.
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