The roadway continues west as the county-maintained portion of Security Boulevard, a four-lane divided highway that leads to the headquarters of the Centers for Medicare & Medicaid Services.

The state highway intersects Belmont Avenue just north of Security Square Mall before its partial cloverleaf interchange with I-695 (Baltimore Beltway) just north of the Beltway's stack interchange with I-70 and MD 570.

East of the Beltway, the state highway intersects Woodlawn Drive and Gwynn Oak Avenue and passes along the northern edge of the Social Security Administration headquarters complex.

The state highway continues through a partial cloverleaf interchange with MD 570 just west of the freeway's eastern terminus at a park and ride facility.

[5] Security Boulevard was extended beyond Rolling Road to its present western terminus in 1972.