A crash involving an ambulance shut down Falls Road between Tuckerman Lane and Montrose Road Friday morning in Potomac, Md.
Police said the driver of the ambulance swerved to avoid a car that was driving on the wrong side of the road.
The ambulance driver over-corrected and went into an embankment. The other car did not stop.
Four emergency workers were in the ambulance. They are all expected to be OK.