Maryland Route 198

Maryland Route 198 is a state highway in the U.S. state of Maryland. The route connects suburban and exurban communities between Laytonsville and Odenton, serving as an arterial for commuters traveling between Gaithersburg, Bowie, and the Baltimore–Washington metropolitan area. It intersects major corridors including I-270, US 29, I-95, and I-97, linking residential neighborhoods, commercial districts, and military and transit facilities.

Route description

Maryland Route 198 begins near Laytonsville at a junction with MD 97 and proceeds east as a two-lane roadway through semi-rural terrain toward Gaithersburg and Montgomery Village, intersecting I-270 and the MD 117 corridor. East of Gaithersburg, the highway widens to accommodate commuter traffic approaching I-95 and crosses Rock Creek tributaries and suburban developments near Columbia and Ellicott City. Continuing into Howard County, the route traverses commercial nodes near Laurel and intersects US 29 before meeting I-97 and MD 3 in the eastbound approach to Anne Arundel County. Near its eastern terminus, the roadway serves the Fort Meade area, providing access to BWI Airport commuter routes and connecting with US 50 and US 301 functions via adjacent arterials. The pavement transitions from two-lane rural sections to four-lane divided segments and includes grade-separated interchanges at key junctions to support regional traffic demands.

History

Construction and designation of the highway began in the early 20th century amid statewide improvements to link agricultural towns and emerging suburbs during the Great Depression era and New Deal infrastructure programs. The route was incrementally extended and realigned through mid-century expansions associated with post-World War II suburbanization and federal defense investments near Fort Meade and the National Security Agency. Major upgrades in the 1960s and 1970s included grade separations and widening projects coordinated with the expansion of I-95 and the development of I-97 to improve access for commuters and military traffic. Later improvements in the 1990s and 2000s addressed congestion from growth in Howard County and Anne Arundel County, integrating the highway with park-and-ride facilities serving MARC regional rail stations and bus services operated by Maryland Transit Administration.

Major intersections

The route meets several principal highways and local arterials that structure regional mobility: intersections with MD 97 near Laytonsville; interchange with I-270 providing access to Rockville and Washington, D.C.; junctions with US 29 and MD 32 serving the Columbia corridor; crossings of I-95 and connections toward Baltimore; junctions with MD 3 and I-97 near Bowie; and proximity to Fort Meade and access routes to BWI Airport, as well as links to US 50 and US 301 corridors that continue toward Annapolis and the Eastern Shore.

Future plans and improvements

Planned improvements have targeted congestion relief, multimodal access, and safety enhancements in coordination with Maryland Department of Transportation initiatives and regional planning bodies such as Metropolitan Washington Council of Governments and Baltimore Regional Transportation Board. Projects include widening segments near growth centers, constructing additional turn lanes and modernized signal systems at major junctions, and implementing bicycle and pedestrian facilities to connect with Baltimore-Washington Parkway and local trail networks tied to Annapolis and Elkridge Railroad Trail and other greenway projects. Improvements near Fort Meade coordinate with U.S. Department of Defense access requirements and National Security Agency commuter plans, while interchange enhancements aim to integrate with future corridor upgrades on I-95 and US 50 to support freight and commuter resiliency.

Auxiliary routes and related highways

The corridor is complemented by related state routes and connectors including MD 179 and MD 170 feeders, as well as county-maintained arterials that provide local access in Montgomery County, Howard County, and Anne Arundel County. These auxiliary links facilitate connections to MARC stations, Metro park-and-ride lots, and regional transit hubs serving BWI Airport and military installations such as Fort Meade.

Category:State highways in Maryland Category:Transportation in Montgomery County, Maryland Category:Transportation in Howard County, Maryland Category:Transportation in Anne Arundel County, Maryland