At about 09:45 eastern time, a Cessna 150L and a Pitts S-2B collided while taxiing at Leesburg Regional Airport. Neither pilot was injured. A witness said the Cessna had just landed and cleared the runway onto an adjoining taxiway. The Pitts was taxiing for takeoff. The witness said both pilots stopped their respective aircraft momentarily, but then proceeded to taxi and struck each other.