The M1 northbound in Northamptonshire has been closed between J15A (A43) and J16 (A45) due to a crash involving two lorries.
Highways England road traffic officers are currently on scene, along with Northamptonshire Police and fire services and East Midlands Ambulance Service, Highways England reports.
Traffic is now being diverted from J15A via the 'Hollow Diamond' diversion symbol.
From J15A, take the A5123 and continue to Danes Camp Way roundabout.
Then, take the second exit to join the A5076 Upton Way, continuing to the A5076/A4500 Sixfields roundabout, taking the first exit onto the A4500 Weedon Road.
Continue on the A4500 to the M1 J16, then rejoin the M1 northbound.
The closure is expected to remain in place for some time - it has been advised to that motorists should allow extra time for their journeys this morning.