 Starting in 1956, MD 139 was expanded to a four-lane divided highway from MD 134 to the modern intersection with Towsontown Boulevard and relocated as a four-lane divided highway from there to the Beltway interchange.Construction was completed from the Beltway interchange south to Joppa Road and from MD 134 to Towsontown Boulevard in 1957.The relocation project, including Joppa Road's bridge over MD 139, was completed in 1958.