The accident involved a car, an SUV and a Washington County school bus.
The bus, 18C, had just dropped off students at Washington County Technical High School so there were no students onboard, said Barbara Scotto, supervisor of transportation for Washington County Public Schools. The bus driver was uninjured, Scotto said.
Maryland State Trooper 1st Class David L. Ward said at the scene that the accident happened shortly after 9 a.m., when a Honda Civic being driven south on Downsville Pike by Jean A. Karcher, 85, of 1044 Bramly Drive in Hagerstown, attempted to turn left onto West Oak Ridge Drive and struck a northbound Kia SUV.
The collision caused Karcher's Civic to crash into a bus that was stopped at the traffic light on West Oak Ridge Drive, Ward said.
The Kia came to rest facing north on the shoulder of Downsville Pike.
The driver of the Kia Jeanette L. Shank, 36, of 1009 Corbett St. in Hagerstown, and her two passengers, ages 4 and 4 months, were taken to Meritus Medical Center as a precaution, Ward said.
Shank was treated and released, a hospital spokeswoman said. The conditions of the children were unavailable.
Ward said Karcher was cited for failure to yield while making a left-hand turn.
The Kia and Honda were towed from the scene. The bus, which had a large dent on its left-hand side, was driven away at about 10 a.m.
West Oak Ridge Drive was closed to traffic at the intersection for about an hour. Downsville Pike remained open.
The Funkstown Volunteer Fire Co. and Halfway Ambulance assisted at the scene.
Staff Writer Julie E. Greene contributed to this story.