Home > Multiplexes > Pennsylvania > I-81/US 322
I-81(N-S)/US 322(E-W) Duplex
Interstate 81 and US Route 322 join for 3 miles on the north side of Harrisburg in Dauphin County.
Timothy Reichard 8/19/02Like the I-83/US 322 duplex, the I-81/US 322 duplex begins and ends at large, high-speed interchanges, the kind that should connect freeways. I-81 and I-83 meet at the eastern split, which is a typicall freeway-to-freeway "Y" interchange. I-81 and US 22 meet at the western split, a full stack interchange with flyover and flyunder ramps. Here is the view on I-81 north approaching the western split, the stack interchange. At the time these photos were taken (August 2002), the entire duplex was under a widening/reconstruction project.
Timothy Reichard 8/19/02This page shows many views of the stack interchange. On I-81 north, ramps leave for the US 22/US 322 duplex and for US 22 east, which leads to PA 230 east.
Timothy Reichard 8/19/02Exit ramps in a stack interchange typically split after leaving the mainline. One ramp curves to the left as a flyover ramp over the mainline to meet the highway that heads left, while the other ramp simply connects to the highway to the right. This type of exit occurs in all four directions, making the eight ramps in the interchange.
Timothy Reichard 8/19/02Flyover ramps in the middle of the interchange.
Timothy Reichard 8/19/02The beginning of the I-81/US 322 duplex. US 322 enters from the ramp on the right.
Timothy Reichard 8/19/02Here is the same interchange as seen from US 22 westbound. US 322 travels from one duplex to another here. These signs have been replaced as part of the I-81 reconstruction project.
Douglas Kerr 9/27/03New signs were posted as the I-81 reconstruction project progressed.
Timothy Reichard 8/19/02The ramps to the I-81/US 322 duplex and I-81 south leave US 22 and then split.
Douglas Kerr 9/27/03Here with the new overhead signs, the two ramps split apart to their respective destinations in the stack interchange.
Timothy Reichard 8/19/02Three miles to the east, US 322 prepares to leave I-81 for I-83. This is the scene at the Progress Avenue exit, which is the one interchange along the duplex (not counting the ends). This middle interchange was partially closed due to construction.
Timothy Reichard 8/19/02More dirt than highway or grass appears during the construction. I-83 begins at the upcoming interchange, which is the eastern split of I-81/US 322 and the northern split of I-83/US 322.
Douglas Kerr 9/27/03New signs and sign gantries were erected as the construction project continued into later phases. Now a diagrammatic guide sign shows the I-81 & I-83 split.
Timothy Reichard 8/19/02Now a look at the duplex in the opposite direction. On I-81 southbound, there is this sign showing which interstate to choose for which exit.
Timothy Reichard 8/19/02Next is the exit to I-83, a left exit to the freeway's beginning.
Timothy Reichard 8/19/02Next up along I-81/US 322 is the Progress Avenue exit and a new sign for the US 22/US 322 TO PA 230 exit. These signs exhibit the contrast between the original guide signs of the freeway and the newer signs, as well as the exit renumbering of 2001.
Timothy Reichard 8/19/02An old version of the newer guide sign of the previous photo.
Timothy Reichard 8/19/02As the stack interchange approaches, US 322 exits onto US 22.
Timothy Reichard 8/19/02I-81 south going through the stack interchange. Flyover ramps fly over the mainline in all four directions.
Timothy Reichard 8/19/02Three levels of bridges rise over the mainline.
Timothy Reichard 8/19/02Backing up a little bit, here is the ramp from I-81 south to US 22 east into Harrisburg. The ramp at the right is US 322 leaving I-81 and joining US 22.
Local Names
American Legion Memorial Highway
Capital Beltway
Capital Beltway
Capital Beltway
William Penn Highway
Twenty-Eighth Division Highway
Terraserver Imagery
Adjacent Multiplexes
North to Wilkes-Barre
South to Staunton, VA
East to Harrisburg
West to Dauphin
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