Alfred M. Kotsch, 78, of 3444 Colonial Court, Allentown, was killed when the motorcyclehe was driving collided with a tractor-trailer. The crash happened Tuesday afternoonat the intersection of Route 873 and Mountain Road in Washington Township. Kotsch was pronounced dead at the scene by Lehigh County Deputy Coroner Jason Nicholas. The name of the driver of the tractor-trailer was not available as of press time.