They are set to continue until spring 2023, although Lancashire County Council hopes problems will ease as motorists get used to the diversions and closures.
Our pictures below from photographer Neil Cross show the extent of the issues in the city centre however.
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7.
A chunk of Corporation Street is closed off and a section of Marsh Lane is also blocked to traffic
8.
Even when the commuter crush was over it was still taking up to 15 minutes longer to crawl through the centre of the city.
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