Interstate 180 or I -180 is an Interstate Highway in the U.S. state of Pennsylvania. The highway connects the city of Williamsport with Interstate 80 and is 46 kilometers long.
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I-180 at Williamsport.
I-180 begins at the cloverleaf with I-80 at Milton and is a continuation of State Route 147, which is also a freeway. The highway has 2×2 lanes and heads north, parallel to the Susquehanna River. I-180 follows the course of the river and later turns west. The highway here leads past a series of small towns, the most important of which is Williamsport. I-180 runs directly past downtown Williamsport and intersects with US 15 / I-99 on the west side of town. The US 220 then continues as a freeway towards Lock Haven.
Long before it became an Interstate Highway, construction of US 220 began as a freeway from I-180 north toward Williamsport. In 1971, the interchange opened with I-80 and a five-mile stretch between Turbotville and Muncy. In 1972, the link between I-80 and Turbotville opened. Two more sections followed in 1974, from Muncy to Pennsdale and a 2 kilometer stretch in Williamsport. In 1975 this section was extended 2 kilometers westward by Williamsport, after which the link between Pennsdale and Williamsport was opened in 1977, but there was still a missing section to the east of Williamsport, which opened in 1980. Beginning in 1982, the highway was renumbered as I-180.
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Interstate 279 in Pennsylvania
Interstate 279 or I -279 is an Interstate Highway in the U.S. state of Pennsylvania. The highway forms a north-south route connecting the city of Pittsburgh to Interstate 79. It is one of the main highways in the metropolitan area. The route is 31 kilometers long.
I-279 with interchange lane.
The Fort Duquesne Bridge (background) in Downtown Pittsburgh.
In downtown Pittsburgh, I-279 begins at an interchange with Interstate 376, running east toward Interstate 76. Immediately afterwards, you arrive at the Fort Duquesne Bridge, over the Allegheny River, which here, together with the Monongahela, forms the Ohio River to the west. This bridge is also double-decked. Immediately after the bridge there is a junction-shaped exit with the SR-65. The highway then curves east with a number of parallel lanes, and after a mile intersects Interstate 579, a short highway to downtown, back over the Allegheny River.
The highway then heads north with 2×3 lanes, with a 2-lane interchangeable lane for HOV use in the central reservation. This means that 5 lanes can be used in the rush hour direction. One now ascends into the hills here, towards the south one has an impressive entrance to the city. Leaving Pittsburgh, the road narrows to 2×2 lanes and the alternating lane also ends. One then enters the sparsely built-up suburbs, which are spread over the hills. At Franklin Park, I-279 rejoins Interstate 79, which heads toward Erie.
I-279 is a relatively young highway. I-279 was originally planned in the late 1950’s as Pittsburgh’s western bypass and the current route through the city as I-79. This was reversed in 1972, the current route was planned as I-279 from then on. On October 17, 1969, the Fort Duquesne Bridge in downtown Pittsburgh, the first section of I-279, opened. The bridge ended up on the secondary road network on the north bank of the Allegheny River for nearly 20 years. The rest of the highway was approved in 1975, but construction didn’t begin until 10 years later in 1985, and the highway through northern Pittsburgh was opened in 1989, as well as the short east-west section along the Allegheny River. The alignment of I-279 is clearly more modern than other highways in and around Pittsburgh.
Between 1973 and 2009, I-279 also passed through western Pittsburgh, up to I-79 just west of the city, through the Fort Pitt Tunnel. This part is very narrow and has 2×2 lanes. With the extension of Interstate 376 west of Pittsburgh, I-279 has been dropped and shortened to downtown Pittsburgh.