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In page Interstate 99:

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Corridor O of the Appalachian Development Highway System was assigned in 1965,[citation needed] running from Cumberland, Maryland (Corridor E, now I-68) to Bellefonte (I-80) along US 220.[1] The portion in Pennsylvania, from Bedford north to Bald Eagle, was upgraded to a freeway in stages from the 1960s to the 1990s. The first section, from US 30 in Bedford to PA 56 near Cessna, opened in the latter half of the 1960s.[2][3] Two more sections—from PA 56 north to modern exit 15 in Blair County and from Charlottsville (exit 45) to Bald Eagle—were completed in the 1970s.[3][4] The portion between exit 15 and Altoona (exit 33) was finished in the 1980s[4][5] while the segment between modern exits 33 and 45 was opened by 1997.[6]