Police were called to the M6 on Tuesday, December 19, at 12.27am after a crash between a pedestrian and a HGV.
The deceased, from Millom, was formally identified as Tatiana Grieve.
The driver of the HGV was said to be a 54-year-old man from the Leeds area.
Police are appealing for anyone who may have seen Mrs Grieve or her vehicle, a silver Toyota Rav 4, on the M6 just south of junction 36 at approximately 12.10am.
Anyone with any information is asked to email [email protected] or call 101 and ask to speak to PC 2190 Batley quoting incident number 4 of the 19th December.