Drivers in Hove face delays next week while engineers fix a gas leak.
The eastbound lane of Kings Road will be closed from its junction with Oriental Place from Tuesday.
Brighton and Hove City Councillor Simon Battle said: "We apologise for this unforeseen road closure.
"Mending the leak is obviously a priority and we hope drivers will be patient until the repairs are completed."
There will be signs at Third Avenue warning of possible delays so drivers will have the opportunity to use an alternative route.
The work is expected to last until next weekend.
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