An under-construction rainbow tunnel in Zhoumou county of Henan's Zhengzhou city is the first and only one of its kind in China, according to the construction workers. It's 400 meters long, has a total investment of nearly 100 million yuan .The tunnel consists of three sections. The middle section is constructed from ordinary concrete, while the north and south ends are made up of blocks of colors transitioning from purple to blue to help drivers get used to the change of light as they enter and exit the tunnel
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