The accident occurred around noon Tuesday along the northbound lanes of Route 202, just north of the Boot Road interchange, in East Goshen Township.
Westtown-East Goshen Regional Police arrived on the scene and found a female driver of 2004 Honda CR-V trapped in the vehicle that rolled after colliding with a guide rail.
The female driver, who is pregnant, was extricated by Goshen Fire Company and transported to Paoli Hospital.
Officials say the driver was wearing her seatbelt at the time of the accident.
Witnesses at the scene tell police that the Honda CR-V was northbound on Rt. 202 in the right lane, when a white SUV entered into the right lane from the left, forcing the Honda CR-V to take evasive action to avoid a collision.
Witnesses say the SUV initially pulled over and stopped on the shoulder but then left the scene.
The Westtown-East Goshen Regional Police Department is seeking to speak with the driver of the SUV who can call police at 610-692-5100. Witnesses are also asked to call police with any information they may have.
Route 202 was closed for hours for the investigation, but by 3:15 p.m. all lanes were opened to traffic.