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.

Maryland Route 28 is a state highway in the U.S. state of Maryland. The state highway runs 37.38 miles (60.16 km) from U.S. Route 15 in Point of Rocks east to MD 182 in Norwood. The western portion of MD 28 is a rural highway connecting several villages in southern Frederick County and western Montgomery County. By contrast, the eastern portion of the state highway is a major east–west commuter route, particularly within Gaithersburg and Rockville.