U.S. Route 29 in Maryland partially coincident with Georgia Avenue
Route description
Georgia Avenue and Colesville Road
US 29 emerges from Washington, D.C., along Georgia Avenue.  Running alongside the Jessup Blair Park, it intersects MD 410, the East–West Highway, just outside the D.C. border.  It then meets the northern terminus of MD 384 and the southern terminus of MD 97 at a four-way intersection in Silver Spring; US 29 subsequently becomes Colesville Road, taking over from MD 384, while MD 97 continues north as Georgia Avenue.
Crossing Sligo Creek Park the highway intersects the Sligo Creek Parkway just to the south of Interstate 495 (Capital Beltway); a partial cloverleaf interchange between the highways prevents direct access from US 29 south to I-495 east and I-495 west to US 29 north.  Now a divided highway, US 29 continues north, intersecting MD 193 just beyond the Capital Beltway; this highway provides access to I-495 that is not available at the aforementioned interchange.Next, US 29 encounters MD 32 at a symmetrical cloverleaf; for an extended period, this interchange marked the southern end of US 29's grade separation, with the entire route south of there being an at-grade expressway. North of the interchange, US 29 intersects several major routes that serve the community of Columbia: Shaker Drive/Seneca Drive, Broken Land Parkway, MD 175, and MD 108. Between Broken Land Parkway and MD 175, US 29 has a right-in/right-out interchange between the southbound carriageway and South Entrance Road; the northbound carriageway has an at-grade direct turnoff to Gates Lane (and formerly another turnoff to Old Columbia Road). Near the MD 108 interchange, the northbound carriageway has another direct turnoff to Diamondback Drive.
Beyond the MD 108 interchange, US 29 upgrades again into a fully limited-access six-lane grade-separated freeway as it encounters the western terminus of MD 100.  The heavy flows to and from MD 100 result in US 29 widening again to eight lanes within the interchange, which also incorporates a three-quarter-diamond interchange with the western terminus of MD 103.  The eight-lane segment narrows to six lanes again as it encounters the historic northern end of the US 29 expressway at U.S. Route 40 within Ellicott City.
Beyond US 40, US 29 interchanges with Interstate 70 at a modified directional cloverleaf, and finally terminates at an at-grade intersection with MD 99 near Mount Hebron.
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