md24

Maryland Route 24 (MD 24) is a state highway in the U.S. state of Maryland. The state highway runs 25.17 miles (40.51 km) from an entrance to Aberdeen Proving Ground in Edgewood north to the Pennsylvania state line near Fawn Grove, Pennsylvania, where the road becomes State Route 2055 (SR 2055). MD 24 is the main north–south highway of Harford County. The southern half of the state highway connects U.S. Route 1 (US 1) and the county seat of Bel Air with Aberdeen Proving Ground, US 40, and Interstate 95 (I-95) through a suburban corridor. The northern half of MD 24 is a rural highway that passes through Rocks State Park.
The original section of MD 24, which began at MD 23 in Forest Hill and included MD 165 through Pylesville, was constructed in the late 1910s and early 1920s. MD 24 was moved to the highway to Fawn Grove after that road was built in the late 1920s and early 1930s. The highway between US 1 in Bel Air and US 40 in Edgewood was also constructed in the late 1920s and early 1930s. The state highway from US 40 south to Aberdeen Proving Ground was constructed as MD 408 around 1930. After the road from Bel Air to Forest Hill was completed in the mid-1930s, MD 24 was extended south to Edgewood.
MD 24 received its first relocation in Edgewood in the mid-1950s after assuming all of MD 408. After another relocation due to the construction of I-95 in the early 1960s, the state highway was placed on a new alignment through Edgewood in the late 1960s and early 1970s; the old alignment became MD 755. MD 24 was relocated to a divided highway from I-95 to US 1 in the late 1980s; the old highway through Bel Air became MD 924. Much of the highway through Edgewood was expanded to a divided highway in the mid-1990s. MD 24's interchange with MD 924 was constructed between 2008 and 2011.

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