High Quality Content by WIKIPEDIA articles! U.S. Route 40 (US 40) in the U.S. state of Maryland runs from western Maryland to Cecil County in the state`s northeastern corner. With a total length of over 200 miles (320 km), it is the longest numbered highway in Maryland. Almost half of the road overlaps with Interstate 68 or Interstate 70, while the old alignment is generally known as U.S. Route 40 Alternate, U.S. Route 40 Scenic, or Maryland Route 144. West of Baltimore, the portions where it does not overlap an Interstate highway are mostly two-lane roads. The portion east of Baltimore is a four-lane divided highway, known as the Pulaski Highway (named for Casimir Pulaski), except for the two-lane Thomas J. Hatem Memorial Bridge, a toll bridge over the Susquehanna River.