Known as Broad Neck Road, the highway runs 6.03 miles (9.70 km) from Langford Bay Road south of Langford in western Kent County north to MD 20 near Chestertown.

The highway, including a county section that would become an extension of MD 446 in 1988, was resurfaced in 1971.

The two-lane undivided highway heads north along Broad Neck, a peninsula between the West Fork Branch and East Fork Branch of Langford Creek.

MD 446 passes through the hamlet of Langford and crosses Mill Pond Creek shortly before reaching its northern terminus at MD 20 (Chestertown Road) west of Chestertown.

[5] The resurfacing contract included the resurfacing of the portion of county-maintained Broad Neck Road that was brought into the state highway system as an extension of MD 446 through a December 1, 1987, road transfer agreement.