ONLY ON CVP: Upper Saddle River police were trying to determine the cause of a rollover that seriously injured a 57-year-old driver on Route 17 earlier today.
Traffic was backed up to Mahwah after the rollover, which occurred around 2 p.m.
Witnesses said the four-door sedan hit the divider in the southbound lanes, flipped and slid before coming to a stop.
The driver was taken to Hackensack University Medical Center, emergency workers said.
Click here to sign up for Daily Voice's free daily emails and news alerts.