Two 18" galvanized steel culverts were installed in my driveway. That was 34+ years ago and they are still as good as new. Neither has ever seen a single drop of water thru them - its kinda dry here - so they should still be good. The raccoons sure like one of them.
If I were to do it again - I would definitely use plastic. Properly installed it will carry the load, it passes water as well a corrugated steel & will never rust out.
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