Editing Interstate 99 (section)

==Route description==
{{lengths table|length_ref=<ref name="fhwa" />}}
|-
|{{abbr|PA|Pennsylvania}}
|{{convert|149.00|mi|km|disp=table}}
|-
|{{abbr|NY|New York}}
|{{convert|12.68|mi|km|disp=table}}
|-
|Total
|{{convert|161.68|mi|km|disp=table}}
|}
===Southern segment===
{{see also|U.S. Route 220 in Pennsylvania}}
I-99 begins at an indirect interchange with US&nbsp;220 and the [[Pennsylvania Turnpike]] ([[Interstate 70 in Pennsylvania|I-70]]/[[Interstate 76 in Pennsylvania|I-76]]) north of [[Bedford, Pennsylvania|Bedford]]. It begins [[Concurrency (road)|concurrent]] with [[U.S. Route 220 in Pennsylvania|US&nbsp;220]], which continues south from the interchange toward the [[Maryland]] state line as a two-lane highway known as the Appalachian Thruway. To access the turnpike, drivers are required to use a short segment of [[U.S. Route 220 Business (Bedford, Pennsylvania)|US&nbsp;220 Business]] (US&nbsp;220 Bus.). North of the turnpike junction, the [[controlled-access highway|freeway]] becomes the Bud Shuster Highway as it heads through a rural portion of [[Bedford County, Pennsylvania|Bedford County]]. It connects to [[Pennsylvania Route&nbsp;56]] (PA&nbsp;56) just west of [[Bedford County Airport]] at exit&nbsp;3 and [[Pennsylvania Route 869|PA&nbsp;869]] at exit&nbsp;7 before crossing into [[Blair County, Pennsylvania|Blair County]]. Here, it meets [[Pennsylvania Route 164|PA&nbsp;164]] north of [[East Freedom, Pennsylvania|East Freedom]] at exit&nbsp;23 prior to entering the [[Altoona, Pennsylvania|Altoona]] area.<ref name="google">{{google maps |url=https://maps.google.com/maps?f=d&source=s_d&saddr=40.057583,-78.517853&daddr=I-99+N%2FPA-26+N&geocode=%3BFSy6cAIdQABe-w&hl=en&mra=mi&mrsp=0&sz=16&sll=40.057069,-78.513815&sspn=0.012055,0.027831&ie=UTF8&z=16 |title= Overview Map of I-99 |access-date=July 18, 2010}}</ref>

In [[Hollidaysburg, Pennsylvania|Hollidaysburg]], a borough south of the city, I-99 and US&nbsp;220 connect to [[U.S. Route 22 in Pennsylvania|US&nbsp;22]] at exit&nbsp;28, a large modified [[trumpet interchange]]. This junction allows travelers to head west toward [[Ebensburg, Pennsylvania|Ebensburg]], [[Johnstown, Pennsylvania|Johnstown]], and [[Pittsburgh]]. The freeway continues to Altoona itself, where it indirectly connects to [[Pennsylvania Route 36|PA&nbsp;36]] via exit&nbsp;32. Unlike the original routing of US&nbsp;220 which goes through the city center, I-99 and US&nbsp;220 mostly bypass it to the east, connecting to the city via streets leading eastward from the downtown district. At the northern edge of Altoona, [[Pennsylvania Route 764|PA&nbsp;764]] joins the old alignment of US&nbsp;220 and parallels I-99 north for {{convert|3|mi|km|spell=in}} toward [[Bellwood, Pennsylvania|Bellwood]]. PA&nbsp;764 leaves old US&nbsp;220 about {{convert|2|mi|km|spell=in}} south of Bellwood, however, and terminates at I-99 exit&nbsp;39. Bellwood itself is served by exit&nbsp;41, which leads to [[Pennsylvania Route 865|PA&nbsp;865]].<ref name="google" />

[[File:I-99 N foliage.jpg|thumb|left|I-99 north near Bald Eagle, Pennsylvania in October 2011]]
The highway veers northeastward from Bellwood to serve the borough of [[Tyrone, Pennsylvania|Tyrone]], located at the junction of old US&nbsp;220 and [[Pennsylvania Route 453|PA&nbsp;453]]. Access to the borough is made by way of exit&nbsp;48, which serves PA&nbsp;453. Past Tyrone, I-99 and US&nbsp;220 head through sparsely populated areas of Blair and [[Centre County, Pennsylvania|Centre]] counties. For this reason, only three exits exist between Tyrone and [[State College, Pennsylvania|State College]]: exit&nbsp;52, serving [[Pennsylvania Route 350|PA&nbsp;350]] and the small community of [[Bald Eagle, Pennsylvania|Bald Eagle]], and exits&nbsp;61 and 62, which connect to [[U.S. Route 322 in Pennsylvania|US&nbsp;322]] and the borough of [[Port Matilda, Pennsylvania|Port Matilda]]. Here, US&nbsp;322 joins I-99 and US&nbsp;220 and follows them eastward to the State College area.<ref name="google" />

[[File:2015-12-14 12 41 37 View north along Interstate 99 and U.S. Route 220 at Exit 73 (East U.S. Route 322, Penn State University, State College) in College Township, Pennsylvania.jpg|right|thumb|I-99/US&nbsp;220 northbound at split with US&nbsp;322 eastbound in [[College Township, Pennsylvania|College Township]], near State College]]
At exit&nbsp;68 ([[U.S. Route 322 Business (State College, Pennsylvania)|US&nbsp;322 Bus.]]), I-99 merges into the [[Mount Nittany Expressway]], an older, northerly bypass of State College. I-99, US&nbsp;220, and US&nbsp;322 follow the expressway to the Mount Nittany Interchange, a [[directional T interchange]] located on the northern fringe of the [[Pennsylvania State University]] campus. [[Beaver Stadium]], the home of the [[Penn State Nittany Lions football]] team, is visible from I-99 at this point. US&nbsp;322 continues east through the interchange to follow the Mount Nittany Expressway while I-99 and US&nbsp;220 split from US&nbsp;322 and head northeastward toward [[Pleasant Gap, Pennsylvania|Pleasant Gap]], which I-99 connects to via exit&nbsp;81 and [[Pennsylvania Route 26|PA&nbsp;26]]. At this point, PA&nbsp;26 joins the freeway and follows it to [[Bellefonte, Pennsylvania|Bellefonte]], served by exit&nbsp;83 and [[Pennsylvania Route 550|PA&nbsp;550]]. The southern segment of I-99 ends about {{convert|1.75|mi|km}} later at an intersection with Musser Lane though the divided highway continues {{convert|0.33|mi|km}} northeast to an interchange with [[Interstate 80 in Pennsylvania|I-80]], where PA&nbsp;26 continues north and US&nbsp;220 joins I-80 east.<ref name="google" />

===Northern segment===
{{main|U.S. Route 15 in New York}}
[[File:US 15 south at Presho NY exit.jpg|thumb|right|Looking southward along US&nbsp;15 (now I-99) from the Smith Road overpass in Presho prior to the road's completion. The highway previously narrowed from four to two lanes in the background]]
The northern segment of I-99 is entirely concurrent with [[U.S. Route 15 in New York|US&nbsp;15]] and starts at the junction of US 220, US 15, and [[Interstate_180_(Pennsylvania)|I-180]]. I-99 crosses through mountainous terrain in [[Lycoming County, Pennsylvania|Lycoming]] and [[Tioga County, Pennsylvania|Tioga]] counties, bypassing [[Mansfield, Pennsylvania|Mansfield]]. The route crosses the Pennsylvania–[[New York (state)|New York]] border north of [[Lawrenceville, Pennsylvania]]. A four-lane freeway through the [[Steuben County, New York|Steuben County]] town of [[Lindley, New York|Lindley]], I-99 crosses through a rock cut, making a large bend to the north and bypassing the hamlet of [[Presho, New York|Presho]]. The freeway enters a [[partial cloverleaf interchange]] with [[County Route 5 (Steuben County, New York)|County Route&nbsp;5]] (CR&nbsp;5; Smith Road). After CR&nbsp;5, I-99 turns northeast through the town of [[Erwin, New York|Erwin]], running to the west of the Indian Hills Golf Club. Making a gradual bend further to the northeast, the freeway crosses the [[Canisteo River]] and enters the hamlet of Erwins, where it enters a [[diamond interchange]] with [[New York State Route 417]] (NY&nbsp;417; Addison Road). After NY&nbsp;417, it then turns alongside [[Norfolk Southern Railway]]'s [[Southern Tier Line]] (former [[Erie Railroad]] main line). Now paralleling the tracks and NY&nbsp;417, I-99/US&nbsp;15 crosses through Erwin, entering exit&nbsp;11, which connects to NY&nbsp;417 once again, next to Gang Mills Yard,<ref name="bing">{{bing maps|url=http://binged.it/Qzs6yW|title=overview map of Interstate 99 in New York|access-date=July 24, 2012}}</ref> the site of former [[Painted Post station]].<ref name="yanosey">{{cite book|last=Yanosey|first=Robert J.|others= Lawton, Devon (photographer)|title=New York|publisher=Morning Sun Books|location=Scotch Plains, New Jersey|date=2006|series=Erie Railroad Facilities in Color|volume=2: NY|page=71|isbn=1-58248-196-2}}</ref>

[[File:Interstate 99 entering New York.jpg|thumb|left|I-99/US&nbsp;15 entering New York]]
After Gang Mills Yard, I-99 crosses through the [[Gang Mills, New York|Gang Mills]] section of Erwin, entering a large interchange at the northern end of the neighborhood. Signed exit&nbsp;12, this interchange serves [[County Route 107 (Steuben County, New York)|CR&nbsp;107]] (Robert Dann Drive) via NY&nbsp;417. After CR&nbsp;107, I-99 enters a large interchange that utilizes several flyover ramps between I-99, US&nbsp;15, [[Interstate 86 in New York|I-86]], and [[New York State Route 17|NY&nbsp;17]] ([[Southern Tier Expressway]]). Ramps are also present, connecting to [[New York State Route 352|NY&nbsp;352]]. This interchange serves as the northern terminus of both I-99 and US&nbsp;15.<ref name="bing" />