U.S. Route 29 (US 29) is a north–south United States Numbered Highway that runs for 1,043.3 miles (1,679.0 km) from Pensacola, Florida, to the western suburbs of Baltimore, Maryland. In the U.S. state of Maryland, US 29 is a major highway that emerges from Washington DC and runs north into eastern Montgomery County, stretching over 25.86 miles (41.62 km) through the state and terminating at Maryland Route 99 (MD 99) outside of Ellicott City. It serves the cities of Columbia and Ellicott City and provides the westernmost north–south route between Washington DC and Baltimore.

Maryland Route 384 is a state highway in the U.S. state of Maryland. The highway runs 0.53 miles (0.85 km) from MD 390 east to U.S. Route 29 and MD 97 within Silver Spring. MD 384 is a six-lane divided highway that forms the southernmost portion of Colesville Road, a major commuting route and one of the two main streets, with Georgia Avenue, within downtown Silver Spring, the commercial hub of southeastern Montgomery County. The state highway also provides access to the Silver Spring station of the Washington Metro, which serves as a transit hub for commuter rail and bus service for the surrounding area. MD 384 and its railroad underpass were constructed in the late 1920s. The highway was expanded to a divided highway in the mid-1970s.