Maryland Route 115 is a state highway in the U.S. state of Maryland. Known as Muncaster Mill Road, the highway runs 5.83 miles (9.38 km) from MD 124 near Redland east to MD 655 at Norbeck. MD 115 is a northwest–southeast highway that connects the suburban communities of Redland and Norbeck in central Montgomery County. The highway was constructed from MD 124 to MD 28 in the late 1920s and early 1930s.

Maryland Route 124 (MD 124) is a state highway in the U.S. state of Maryland. The highway runs 17.03 miles (27.41 km) from MD 28 in Darnestown north to MD 108 in Damascus. MD 124 connects the central and northern Montgomery County communities of Gaithersburg, Montgomery Village, Redland, Laytonsville, and Damascus. The route is a major conduit on the western and northern sides of Gaithersburg, where the highway serves the National Institute of Standards and Technology and the former Lakeforest Mall and connects with Interstate 270 (I-270) and MD 355. MD 124 continues north past the Montgomery County Airpark, beyond which the route changes from a four- to six-lane divided highway to a two-lane undivided road as it passes west of Laytonsville on its way to Damascus.