page_title: Interstate 83
section_title: Baltimore-Harrisburg Expressway
hierarchical_section_title: Interstate 83 / Route description / Maryland / Baltimore-Harrisburg Expressway
caption_attribution_description: Traveling southbound on the Harrisburg-Baltimore Expwy in Maryland. Note that the traffic is congested going north, from Baltimore toward Pennsylvania Photo taken during "Evening" Peak Hours
context_page_description: Interstate 83 is an Interstate Highway in the Eastern United States. Its southern terminus is in Baltimore, Maryland at a signalized intersection with Fayette Street; its northern terminus is near Harrisburg, Pennsylvania at I-81.
  Most of the route south of Lemoyne, Pennsylvania is a direct replacement of U.S. Route 111, a former spur of US 11.
context_section_description: After separating from the Beltway, I-83 is now known as the Baltimore-Harrisburg Expressway. Running due north away from the Beltway, the route parallels MD 45 York Road, the former route of US 111. Passing to the west of Timonium and Cockeysville, I-83 leaves the suburban belt around Baltimore and enters rural Baltimore County just north of Hunt Valley at Shawan Road. I-83 and MD 45 continue to parallel one another through the northern portion of the county, with MD 45 crossing over I-83 once, at an interchange. This segment of I-83 has several sections with higher than usual gradients.
  The only major settlement encountered by I-83 along this stretch is Monkton, reached via MD 137. To the west of I-83, MD 137 connects with the northern terminus of MD 25, I-83's former companion to the south.
  The Interstate eventually crosses the Mason–Dixon line into York County, Pennsylvania, 25 miles (40 km) north of Baltimore, mere feet from a partial interchange with Freeland Road and parallel with MD 45; the latter route becomes the Susquehanna Trail when it reaches Pennsylvania.
caption: Traveling south on I-83 in Baltimore County, with congestion on the northbound side
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