Two people who died when a vehicle transporter crossed the central reservation into traffic on the M1 have been named as Maria Rossi, also known as Olga, and her husband Dario Rossi.
Olga Rossi, 80, was driving southbound with Dario, 85, as the passenger when the transporter crossed carriageways between junctions 14 and 15 on Monday.
The transporter overturned onto their car and the couple, from Dunmow in Essex, died at the scene.
Several other people were injured.
The collision happened at about 14:50 BST on Monday and the motorway was closed until about 04:50 on Tuesday.
Northamptonshire Police said crash investigations were ongoing.