The City of Lincoln Council says a new one-way system around the annual Christmas market is necessary to deal with the huge crowds that attend.
Spokesperson John Latham says this year's event from the 6-9th December will be safer because of the change.
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After a wet and windy start, rain will clear to the north to leave it dry, with easing winds but largely cloudy skies.
Early rain will clear northwards during the morning, allowing drier conditions behind.
Thousands of patients have had their operations and appointments cancelled despite a strike by junior doctors being called off.