eli5 Why are bridges always set at the same level (straight rather than one side shorter than the other)?

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I just realized last night I’ve never seen that, even though often times bridges are connecting cliff faces or different bodies of land. So… why? Why do they always seem to start on the same level?

Also please let me know if that’s the wrong tag… mental five year old me wasn’t sure.

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4 Answers

Anonymous 0 Comments

It’s mainly because most features are relatively level.
We don’t really have many problems making a ramp.
We build them to connect surface and elevated highways/roads all the time.

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