 MD 140 is accessed via a pair of right-in/right-out interchanges with Emmit Gardens Drive, which is unsigned MD 904H on the northbound side of US 15 and MD 904F on the southbound side.North of MD 140, the southbound direction of US 15 has a welcome center, the Mason and Dixon Discovery Center.US 15's last intersection in Maryland is with the northern end of US 15 Business (Seton Avenue) and Welty Road, which leads to Old Gettysburg Road.