In 1963, the existing road north from the Merritt Boulevard – North Point Road intersection was expanded to a divided highway through its junction with MD 151. This section of highway was reconstructed in 1968 and 1969 as the ramps between North Point Road and I-695 that also serve MD 151 and MD 150. The portion of Peninsula Expressway south of the Bear Creek bridge was brought into the state highway system as MD 157 around 1991. When I-695 was transformed from a two-lane viaduct to a four-lane surface freeway between 1995 and 1999, MD 157's interchange with MD 158 was transformed into an interchange with I-695. The remainder of Peninsula Expressway and Merritt Boulevard to North Point Boulevard became part of MD 157 around 1999.