The highway was expanded to a divided highway between Marlow Heights and Silver Hill in the early 1970s, around its interchange with Interstate 95 (I-95) and I-495 in the early 1980s, and around MD 210 in Oxon Hill in the late 1980s. MD 414 was reconstructed around MD 210 again in the mid-2000s with the construction of National Harbor and the new Woodrow Wilson Bridge.
The highway underwent expansions between Marlow Heights and Silver Hill in the early 1970s, around its intersection with I-95 and I-495 in the early 1980s, and around MD 210 in Oxon Hill in the late 1980s.  MD 414 was reconstructed near MD 210 again in the mid-2000s with the development of National Harbor and the new Woodrow Wilson Bridge.