By ROBIN HINDERY
Th eAssociated Press

WEST SACRAMENTO, Calif. — A university bus carrying medical students and health workers overturned on a busy freeway interchange Thursday, injuring 20 people and snarling rush-hour traffic around the state capital.

All the injuries were minor, a California Highway Patrol spokesman said.

The University of California, Davis, bus crashed shortly before 9 a.m., Sgt. Evan Williams said. All five lanes were closed on the freeway, part of the downtown business portion of Interstate 80.

"The bus shook violently then tipped; that's all I remember," said Charity Onore, 23, who was headed to work at UC Davis Medical Center in Sacramento. "I'm a little sore but mostly scared."

The bus was carrying 28 passengers, Williams said. Most were students and hospital employees, said Meagan Herda, 20, a student assistant in pediatrics.

"It seemed like maybe she (the bus driver) was overcompensating and trying to get out of the way of something," Herda said.

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The bus shuttles faculty and staff members, students and volunteers between the hospital and the Davis campus on 14 daily roundtrips, said David Ong, a university spokesman.