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.
MD 124 was built from Laytonsville south to Redland by 1910 and constructed from Gaithersburg to its southern end in the early 1910s. The intervening segment between Gaithersburg and Redland was built via Washington Grove in the early 1920s. MD 124's original route was completed when Laytonsville–Damascus highway was constructed between the mid-1920s and early 1930s. The highway bypassed Laytonsville in the late 1950s. MD 124 was rerouted through the western portion of Gaithersburg in the mid-1970s along a highway built in the mid-1950s concurrent with I-270 construction; the old route eventually became part of MD 117. In the mid-1990s. the highway was rerouted again north of MD 355, bypassing downtown Gaithersburg and Washington Grove along highways built by Montgomery County in the mid-1970s and late 1980s. MD 124 was expanded to a divided highway around I-270 by the mid-1970s, between there and its southern end in the late 1980s and late 1990s, along its northern bypass of Gaithersburg when it was placed on the bypass, and near the Montgomery County Airpark in 2010.
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