Police want to speak to anyone who witnessed a crash involving multiple vehicles on the M18 northbound on the morning of Monday (September 12).
Four lorries were involved in the collision at around 9am between junctions 1 and 2. Two drivers suffered minor injuries.
It is thought an unknown car may have come to a stop on the outside lane with its hazard lights on, just before the incident happened.
Did you see the crash? Did you see a car stop in the outside lane just before?
If you have information which could help, call South Yorkshire Police on 101, quoting incident number 209 of 13 September 2016.