 MD 117 was expanded to a divided highway from west of MD 118 to MD 119 in Germantown and on either side of its intersection with MD 124 in Gaithersburg by 1999.Since at least 1950, West Diamond Avenue had passed under MD 355's bridge across the railroad and met that highway at an oblique intersection.In 1987, MD 355's bridge was replaced with the present bridge and the oblique intersection was replaced with a more gentle curve and right-in/right-out interchange with northbound MD 355.