Why are metal bridges usually green or red?

Question:
I've noticed a lot of metal bridges are painted either green or red. Is there some reason behind this?

Answers:

Broken Axle?

The additives in the paint that inhibit corrosion frequently make the paint that color.

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Why are small cars popular in Canada than in US?

It is an all out attempt to keep aircraft from crashing
into bridges, making them more visible, such as the
Golden Gate Bridge is red to contrast with bay fog.

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What are peoples favourite cars and why?

It is basically near bomb proof primer/paint. If they could use stainless steel they would (less maintenance)

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What is the number for the engine room?

The red ones may be made from Cor-Ten steel. It's an unpainted weathering steel sometimes used for bridges, buildings, and other outdoor steel structures.

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