Maryland Route 157 is a state highway located in Baltimore County in the U.S. state of Maryland. The state highway runs 4.79 miles (7.71 km) from MD 158 in Sparrows Point north to North Point Road in Dundalk. MD 157 is an L-shaped highway serves as the primary highway through Dundalk and from Dundalk to Interstate 695 (I-695). The two highways to which MD 157 is assigned, Merritt Boulevard and Peninsula Expressway, were constructed as a four-lane divided county highway in the early 1960s. In the late 1960s, Merritt Boulevard was extended as ramps to I-695 that also serve MD 151 and MD 150. MD 157 was assigned to the highway in Sparrows Point in the early 1990s and extended through Dundalk to its present northern terminus in the late 1990s.

Maryland Route 158 is a state highway located in Baltimore County in the U.S. state of Maryland. Known as Bethlehem Boulevard, the state highway runs 2.35 miles (3.78 km) from Riverside Drive in Sparrows Point east to North Point Road in Edgemere. MD 158 parallels Interstate 695 (I-695) along the northern edge of the former Bethlehem Steel complex at Sparrows Point and connects MD 157 with MD 151. Bethlehem Boulevard was constructed as a four-lane divided county highway with several interchanges in the late 1950s. The highway was designated MD 158 in the early 1990s. When I-695 was completely rebuilt and expanded from two to four lanes through Sparrows Point and Edgemere in the late 1990s, MD 158 was also reconstructed as a mostly two-lane highway without interchanges.