Motorists travelling west along the A14 have been warned of closures at the junction with the M6 and M1 later this month.
Parts of the Catthorpe Interchange, which links the three roads, are due to be closed over three nights for work to be carried out by the Highways Agency.
The entry slip road from the A14 to the westbound M6 will be closed from 8pm on Saturday, March 22, until 8am the following morning. The westbound link from the M1 to the M6 will also be closed at that time.
Traffic will be diverted via the M1 northbound to junction 20 for Lutterworth, the A4303 and A426 to join the M6 at junction one.
On the nights of Wednesday, March 26, and Thursday, March 27, from 9pm to 6am each night, the M6 will be shut southbound beyond junction one, meaning traffic will not be able to join the A14 or the M1 directly.
Traffic will again be diverted from junction one of the M6, to the A426 and A4303 at Lutterworth and south along the M1 to junction 19.
The Highways Agency says if the second set of work can be completed overnight on Wednesday, the roads would not be closed on the Thursday night.
Work on the Catthorpe Interchange, which will see direct links between the A14 and the M1 and between the A14 and M6 in both directions, got under way in January.
The scheme, which comes with a price tag of £119 million, is due to last until autumn 2016.
Ivan Marriott, Highways Agency project manager, said: “These closures are necessary in order for us to change the traffic management needed for the next part of the scheme. This can only be done safely by closing the affected carriageways at junction 19.
“This will have an impact on journey times so we would advise motorists to allow extra time for their journeys on these dates.”