Police say formal identification of the victims of the M5 collision on Saturday will not be completed this week.
Four people died in the collision, which happened between J15 and 14 in South Gloucestershire.
One of the victims was named yesterday as 46-year-old Adrian Beaumont, from Bristol.
Avon and Somerset Constabulary say they are still examining the vehicles.
Three people remain in hospital and our thoughts are with them and their loved ones.
We’re still at the start of a lengthy and complex investigation to determine what happened.
We’ve had more than 50 witnesses come forward with information so it’ll take time to speak to all these people and take statements. We’d like to thank the public for their support and assistance.
The examination of the vehicles also continues and we’re working closely with experts who will assist us in determining what caused this tragic collision.
We’re keen to hear from any witnesses who have not already provided their details, in particular anyone who may have been travelling on the southbound carriageway who saw the white Mercedes box van immediately prior to the collision.
The collision happened near J14 of the M5 earlier this month.
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Police have reopened the M5 after a "horrific" crash on the motorway killed four people over the weekend.