424 Accident (Updated)

Two women were critically injured in a head-on collision Saturday morning on Route 424 in Davidsonville, police said. 

Around 9 a.m., a 20-year-old woman driving a 2007 Mercury Milan westbound near Rutland Road swerved over the yellow line "for no obvious reason" and hit a 2008 Subaru Legacy driving eastbound, said Anne Arundel Police spokesman Lt. Ryan Frashure.

Police have identified the driver of the Mercury as Shelby Neff of Bowie.

The driver of the Subaru, whom police have identified as Cheryle Holmes, 38, of Lothian, was said to be conscious at the scene. Neff was flown to University of Maryland Shock Trauma Center in Baltimore, and Holmes was taken to Prince George's Hospital Center, police said. 

Neff remained in critical condition Monday morning, a hospital spokeswoman said.

As of late Monday morning, Holmes' condition had been upgraded to serious, a Prince George's Hospital Center spokeswoman said.

A preliminary investigation indicates the primary cause of the crash appears to be driver error on the part of Neff, police said. An investigation by the police's Traffic Safety Section remains ongoing.

Any charges are pending review by the county state's attorney's office, police said.