That really is a great question.๐ So great, I had to look it up on Google to find an answer.๐
Apparently it's not just a pretty roof over a bridge. It serves the purpose of keeping the elements from deteriorating the load bearing timbers that might last only 10-20 years without protection. A roof can also increase the structural integrity of the bridge allowing a longer span.
Here is a link with more information if you are interested.
Thank you for checking it out @oldman. Seems like it was popular in the State because I don't think I've seen it in UK before. Good to learn something new on Hive again.
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tokens.