 The highway bypassed Lewistown in 1962, leaving behind its old alignment of Hessong Bridge Road and Angleberger Road, which became a section of MD 806.Construction on the U.S. Highway's bypass of Emmitsburg began in 1963.The following year, the portion of US 15 from the northern end of the bypass to the Pennsylvania state line opened contemporaneously with US 15's bypass of Gettysburg.