 The other major relocation of US 11 occurred around Hagerstown Regional Airport . Due to the airport 's east – west runway being extended eastward , US 11 was relocated by Washington County in 1964 , resulting in a wide curve in what had been a straight highway . The portion of highway between Showalter Road and the Pennsylvania state line was subsequently county @-@ maintained until 1972 . Another extension of the east – west runway occurred between 2004 and 2007 . For this extension , US 11 was relocated to a tunnel underneath the extended runway along the curved alignment in 2006 . 
