The America, Sutton, has been closed by the Highways Agency due to a burst water main.
The pipe has ruptured beneath the road surface and water pressure is physically lifting the concrete.
A police spokesman said: “It’s not safe for traffic and Anglian Water will be attending to commence repairs.
“This section of road in Sutton is likely to be closed for at least six hours (probably longer I’m afraid).
“For members of the community suffering a loss of water in and around that area - that’s the reason!”
The spokesman added: “Do avoid this area if you possibly can.”
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