The Highways Agency has warned of overnight closures at the Catthorpe Interchange later this week.
The junction, which connects the A14 with the M1 and the M6, is the subject of a £191 million improvement scheme.
Yesterday (Tuesday, April 22), Prime Minister David Cameron and Chancellor George Osborne toured the site of the works.
Tonight (Wednesday) the M6 southbound exit slip road to the A14 will be closed from 9pm to 6am, with traffic diverted via the M1 southbound to junction 18. It will then turn around and return on the northbound carriageway to junction 20, then turn around again and head south to junction 19 – a total diversion of approximately 16 miles.
Tomorrow night (Thursday) the M1 northbound entry slip road from the A14 will also be closed from 9pm to 6am for the installation of temporary barriers.
Traffic will be diverted via the M6 westbound to junction 1 onto the A426 northbound to A4303 eastbound to junction 20 of the M1.
On Thursday, May 1, the M6 westbound carriageway will be closed between the M1 junction 19 to M6 junction 1 for survey work. The closure takes place from 9pm to 6am.
Traffic will be diverted via the M1 northbound to junction 20, the A4303 and A426 to join the M6 at junction 1.
Ivan Marriott, Highways Agency project manager said: “This work can only be done safely with complete closures. We will minimise delays by carrying out the work at night but advise motorists to allow extra time for their journeys on these dates.”
The M1 Junction 19 Improvement Scheme near Catthorpe, Leicestershire, started in January. The scheme is designed to reduce congestion and improve journey time reliability and safety by replacing the existing junction with a three-level junction and improving roads between the villages of Catthorpe and Swinford so local traffic can avoid the junction.