Introduction to the seven-color guardrail: The guardrail design of the Hangzhou Bay Bridge is very unique. The colors of the guardrail are made of seven colors of the rainbow. Each color covers five kilometers. From Cixi to Haiyan, they are red, orange, yellow, green, green and blue. ,purple. Such a design can prevent drivers from visual fatigue and reduce the risk of car accidents. At the same time, the colorful colors also make the bridge look more beautiful.

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