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What are the round iron plates on the road used for?

Since sewerage piping in road sections is constructed by the jacking method, after excavating the work shaft, other utility units must be informed for pipeline migration so that the tunneling of sewerage pipeline can be continued; before completing the tunneling work, an anti-slip cover plate will be applied temporarily for maintaining smoot traffic and pedestrian safety. This plate will be removed when tunneling and manhole construction are completed, the road surface will be leveled and restored as well.