SPEED restrictions and road closures will be in place on the M40 through Oxfordshire until the end of May.
A 50mph limit will be enforced in both directions between junction 6 at Thame and junction 10 at Northampton.
The road will also be closed in phases with traffic being diverted off and back on again.
The overnight works began last night and will continue until May 31 - 8pm to 8am every night.
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