(Rolling Prairie, IN) - Whether alcohol or drugs were involved in a serious injury motor vehicle crash in La Porte County this week remains under investigation.

The accident happened Wednesday about 7 p.m. on U.S. 20 near 350 East.

La Porte County Police said Amanda Runion, 37, was stopped waiting for oncoming traffic to clear so she could turn left into her driveway.

A car approaching from behind slammed into the back end of her SUV. Runion complained of pain, blurry vision and had a large knot on her head.  Her six-month-old baby in a car seat was not injured.

The other driver, Shane Ransom, 42, of La Porte was unresponsive and taken to a South Bend hospital. It appears Ransom was not wearing a seat belt at the time of the incident.

Police said there were no tire tracks left by the Ransom vehicle to indicate he tried braking prior to the collision.