Editing Interstate 99 (section)

===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" />