A rollover accident on the turnpike seriously injured two women Tuesday night after troopers said their minivan veered off the highway and into a guardrail.
Eastbound traffic along I-44 was narrowed to one lane near mile marker 48, just south of Elgin, around 7 p.m.
Troopers believe the driver suddenly slowed down for an unknown reason before she hit the rail.
The impact sent the van rolling into a ditch.
No one else was injured in the accident.