Maryland Route 355

Maryland Route 355 is a major north–south state highway in central Maryland. It links suburban and urban centers from Bethesda through Rockville and Gaithersburg to Frederick, paralleling I-270 and serving commercial corridors, transit hubs, and civic districts. The route follows historic alignments of U.S. Route 240 and provides access to institutions such as National Institutes of Health, Walter Reed National Military Medical Center, and NIST.

Route description

MD 355 begins in Bethesda at the junction with U.S. Route 1 and MD 187, proceeding north as Wisconsin Avenue through neighborhoods near Georgetown University, NIH, and WRNMMC. Entering Kensington and Gaithersburg, the highway intersects arterial routes including MD 185 (Connecticut Avenue), MD 188, and MD 28 (Darnestown Road), providing links to Bethesda Trolley Trail, Montgomery College, and Wheaton. Through Rockville the road becomes a principal commercial spine, intersecting MD 586 and passing near MDSHA facilities and Rockville Town Square. Northward, MD 355 runs adjacent to major transit nodes serving Washington Metro stations and regional bus networks before reaching suburban employment centers in Germantown and Frederick. In Frederick County the highway passes near Frederick Municipal Airport and terminates at the junction with I-70 and US 40 in downtown Frederick, providing direct routes to Baltimore, Washington, D.C., and Hagerstown.

History

The corridor that became MD 355 traces its origins to early turnpikes and the 19th-century roadways linking Washington, D.C., Rockville, and Frederick. During the 1920s the alignment was designated as U.S. Route 240, a primary connector between Washington, D.C. and US 15 at Gettysburg via Frederick. Postwar growth, including the expansion of NIH, WRNMMC, and NIST, drove upgrades and bypasses. With the construction of I-270 in the 1950s–1970s, long-distance traffic shifted away from the surface route; the former US 240 alignment was gradually redesignated as MD 355 by the MDSHA and local jurisdictions. Urban renewal and commercial development in Rockville Town Square, Gaithersburg, and Frederick led to streetscape projects, pedestrian improvements, and multimodal integration tied to Washington Metro expansions. Recent decades have seen debates involving Montgomery County planning, Frederick County economic development, historic preservation groups, and transit advocates about balancing automobile capacity with transit-oriented development and roadway safety.

Major intersections

The route's principal intersections connect MD 355 with federal and state corridors, local arterials, and interstate highways: - Southern terminus: junction with US 1 / MD 187 in Bethesda, linking to K Street, Massachusetts Avenue, and the National Mall corridors. - Interchange areas with MD 190 (River Road), providing access to Potomac and Dumbarton Oaks. - Crossings of MD 185 (Connecticut Avenue) near Chevy Chase and Friendship Heights. - Junctions with MD 586, MD 28, and MD 124 (Quince Orchard Road) near Rockville and Gaithersburg. - Connections to I-270 via multiple interchanges and collector roads, serving commuters to Gaithersburg, Germantown, and Clarksburg. - Northern terminus: junction with I-70 / US 40 in Frederick, providing routes to Baltimore and Cumberland.

Auxiliary routes

MD 355 has had several auxiliary and former spur designations used for short connectors, ramps, and bypass segments within Montgomery County and Frederick County. These include numbered segments maintained by the MDSHA that link MD 355 to parallel facilities such as Washington Metro stations, park-and-ride lots serving Ride On and MTA Maryland services, municipal streets in Rockville Town Square, and business routes through historic downtowns like Frederick. Some auxiliary routes were reclassified as local streets during jurisdictional transfers involving Montgomery County planning authorities and Frederick County transportation departments.

Future and improvements

Planned and proposed projects affecting the MD 355 corridor involve streetscape enhancements, multimodal upgrades, and safety improvements coordinated by MDOT and MDSHA with input from Montgomery County and Frederick County. Initiatives include pedestrian and bicycle facilities linked to the Capital Crescent Trail and C&O Canal access, transit signal priority for Washington Metro bus connections, and intersection redesigns near Rockville Metro Station and Gaithersburg transit centers. Proposals have been evaluated in environmental studies influenced by NEPA processes and state transportation plans, with stakeholder engagement from MTA and regional planning bodies such as the MWCOG. Future deliberations balance regional mobility to Washington, D.C. and Baltimore with local development priorities around Rockville Town Square, Gaithersburg redevelopment, and Frederick downtown revitalization.

Category:State highways in Maryland