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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One motorist told us: "It's an absolute nightmare. You just can't get anywhere without going round the houses."
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Officials revealed the behaviour of drivers is being monitored, including whether they are following signs
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