Two 18-year-old women sustained severe injuries Tuesday night in a single vehicle collision on Highway 99 in Turlock.

The collision happened around 11:15 p.m. Tuesday on Highway 99, near Lander Avenue.

The driver, an 18-year-old woman from Earlimart, was behind the wheel of a 2007 Honda headed south on the highway at an unknown speed.

The California Highway Patrol said the vehicle drifted off the highway and into the dirt median, where the driver lost control of the Honda.

The Honda spun out of control until the back end struck the concrete barrier. The force of the impact caused the Honda to overturn multiple times until coming to a stop on the wheels on the highway, the CHP reported.

The driver was not wearing a seatbelt and sustained severe injuries. She was rushed to Doctors Medical Center, where she remains on life support in grave condition, according to the CHP.

The passenger, Andrea Higuera, 18, of Delano sustained major injuries including a broken arm. She was transported to Doctors Medical Center. Higuera was wearing a seatbelt.

Alcohol and drugs did not appear to be factors in the collision, according to the CHP.

The CHP reminds people that the use of seatbelts can save lives.