Interstate 70 in Maryland

By | October 14, 2022


Get started Hancock
End Baltimore
Length 94 mi
Length 151 km

  • 1A → Cumberland
  • 1B → Berkeley Springs
  • 3 Hancock
  • 12 Big Pool
  • 18 Clear Spring
  • 24 Williamsport
  • 26 → Roanoke / Harrisburg
  • 28-32: Hagerstown
  • 28 Downsville Pike
  • 29 Potomac Street
  • 32 National Pike
  • 35 Mapleville Road
  • 42 Myersville
  • 48-56: Frederick
  • 48 Baltimore National Pike
  • 49 Old National Pike
  • 52
  • 53 → Washington
  • 54 East Street
  • 55 South Street
  • 56 Patrick Street
  • 59 Old National Pike
  • 62 New Market
  • 68 Mount Airy
  • 73 Damascus
  • 76 Eldersburg
  • 80 Eldersburg
  • 81
  • 83 Marriottsville
  • 87
  • 91 → Baltimore Beltway
  • 94 Security Boulevard

Interstate 70 or I -70 is an Interstate Highway in the U.S. state of Maryland. The highway runs from Hancock at the Pennsylvania border to Baltimore, and is the last state on the highway’s route, as the road ends just inside Baltimore’s ring road. The highway also serves traffic from the Washington region heading west. The route is 151 kilometers long.

  • WATCHTUTORIALS.ORG: Features why Maryland has the nickname as Old Line State and its economy, history and geography.

Travel directions

I-70 near Lisbon, west of Baltimore.

I-70 at Hagerstown.

At Hancock, Interstate 70 in Pennsylvania crosses the border with Maryland, and immediately follows the interchange with Interstate 68, because the state of Maryland is only 2 miles wide here. US 40 merges with I-68 and merges with I-70. One then comes along the Potomac River, which flows into Washington. You soon reach the town of Hagerstown, where you cross Interstate 81, which runs from Roanoke in Virginia to Harrisburg and Scranton in Pennsylvania. After Hagerstown, I-70 turns southeast toward the city of Washington. One then arrives at Frederick, a small town of 59,000 inhabitants. Here it intersects US 340, the highway to Charlestown in West Virginia, and Interstate 270, which runs directly to Washington, and here traffic to Washington and Baltimore splits.

From Frederick there are 2×3 lanes available for traffic. The city of Baltimore is then not far away. There are already suburbs along the highway here. Closer to Baltimore, the road narrows again to 2×2 lanes. It crosses US 29, the highway to Columbia, a suburb of both Baltimore and Washington, which is not far south. The highway also provides access to SR-100 to Annapolis, Maryland’s capital. The highway then has 2×3 lanes again, and you quickly reach the Baltimore ring, Interstate 695. This node is a symmetric stack node. Right on the border with Baltimore, the highway ends abruptly, and one has to turn off and continue on the US 40, a single-storey main road, to the center.

  • Provides state overview of Maryland and its alternative name as The Old Line State


In about 1950, the first section of highway between Lisbon and Ellicott City opened to traffic. This portion of the highway then became US 40 to Baltimore, which was also equipped with 2×2 lanes. About 1952 a westward extension of this route to Mount Airy opened. About 1954 or 1955 this section was extended further west to just east of Frederick. About 1955, Frederick’s southern bypass opened to traffic, providing a through section of highway for about 30 miles.

The creation of the Interstate Highway system in 1956 made it possible to build the rest of the highway. In the mid to late 1960s, the route was opened from the Pennsylvania border to Frederick, and US 40 was renumbered I-70. US 40 was not upgraded between Ellicott City and Baltimore, but a new route was built north of US 40.

In 1974 the highway was provided with exit numbers. Between 1997 and 2002, the route around Frederick was reconstructed. The plan was once to extend I-70 to downtown Baltimore. However, this was not realized due to the Freeway Revolts. The highway therefore ends abruptly on the Baltimore border.

Between 2011 and 2013, a small portion of I-70 in Frederick was widened to 2×3 lanes. A new SPUI has also been realized as an entrance to the city. This project was completed in October 2013.

Traffic intensities

A sign showing distances to faraway destinations along I-70, including Cove Fort terminus.

20,000 vehicles cross the Pennsylvania border every day. This doubles right after the interchange with I-68. There are 68,000 vehicles per day between Hagerstown and Frederick. Between Frederick and Baltimore, this is 80,000 vehicles, increasing to 95,000 vehicles for I-695. 25,000 vehicles continue to Baltimore.

Interstate 70 in Maryland