sentences:  The speed limit increases to as the Interstate passes along the eastern edge of Maugansville, where the highway meets Maugans Avenue at a diamond interchange (Exit 9).I-81 meets Showalter Road, which is used to access Hagerstown Regional Airport, at a cloverleaf interchange (Exit 10) as the freeway gently curves around the airport's runway.The Interstate heads northeast to the Pennsylvania state line, on top of which the highway meets PA 163 (Mason Dixon Road) at Exit 1 of the Pennsylvania exit sequence.