Glenn Dale Boulevard, a four-lane divided highway, was finished in 1986 when its bridge over the Penn Line was completed, replacing a grade crossing at Glenn Dale Road. Glenn Dale Boulevard extended south to the intersection of MD 450 and MD 556. MD 193 was extended south on Glenn Dale Boulevard then replaced MD 556 on Enterprise Road south to MD 214. Finally, Watkins Park Drive was built in 1988 on a new alignment, replacing Enterprise Road south of MD 214. MD 193 was extended along Watkins Park Drive and replaced the remaining segment of MD 556.
