The MD 198 divided highway was extended west from Sweitzer Lane to what was then US 29 in 1985. That same year, the state highway was expanded to a divided highway from US 1 to the Patuxent River. MD 198 was rebuilt as a divided highway from the Patuxent River to just west of the Baltimore–Washington Parkway in 1987. The divided highway was extended through the parkway interchange in 1991. As part of the construction, the original five-ramp partial cloverleaf interchange had a loop ramp added from the northbound parkway to westbound MD 198. That same year, MD 198 was extended east from the Little Patuxent River to newly constructed MD 32 in Fort Meade. The state highway's western terminus was relocated from an acute intersection with MD 650 to an orthogonal intersection in 1997. The west leg of the intersection became operational when the extended Norbeck Road, a county highway connecting the ends of MD 28 and MD 198, opened in 2004. MD 198's eastern end was extended along its current course when the MD 198–MD 32 dumbbell interchange was completed in 2002. The MD 198–US 29 interchange opened in 2005.