MD 193 reached its final extent by taking over MD 556 between Glenn Dale and Greater Upper Marlboro in the late 1980s. The state highway's expansion from a two-lane road to a divided highway with four to six lanes began in the 1950s and continued through the 1990s.
MD 193 expanded its reach by taking over MD 556 between Glenn Dale and Greater Upper Marlboro during the late 1980s, marking a period of significant highway development in the state. The expansion from a two-lane road to a divided highway with four to six lanes began in the 1950s and continued through the 1990s.