The mother (lone survivor) front seat passenger, was wearing a seat belt. I've heard she was asleep at the time of the accident. I think she had a broken leg, broken arm and broken ribs.
Del 1 is not a bad road, limited access, but no median barriers. And particularly in the northbound lanes) often excessive speed (personal observation only - I used to drive this road often).
They would have done a blood alcohol when the truck driver was taken to the hospital so I think we can assume he wasn’t alcohol impaired. I would think drug testing should be back by now (3+ weeks).
Notice the front of the pickup is not damaged - it was not what we usually call a “head on collision.
I’m not trying to assign blame but am willing to wait until the state finishes its investigation.