Interstate 79 runs north-south in western Pennsylvania, and it runs northeast-southwest from northeastern West Virginia down to Charleston, West Virginia.  It enters no other states besides Pennsylvania and West Virginia.  The southern end occurs at Interstate 77 in Charleston, West Virginia, just north of where Interstate 77 meets Interstate 64.  Interstate 79 continues northeast from there to Morgantown, in the northeast corner of the state (excepting West Virginia's panhandles).  At Morgantown, Interstate 79 bends to go northerly rather than northeasterly, crossing into Pennsylvania just after leaving Morgantown.  Interstate 79 runs north through the entire height of western Pennsylvania, flanking the western side of Pittsburgh.  Interstate 79 is the main north-south highway linking the Pittsburgh area to other locales, but it only provides access to Pittsburgh itself using the proxies of Interstate 279 and Interstate 376.  The northernmost piece of Interstate 79 proceeds beyond Interstate 90 into Erie, Pennsylvania. The final interchange provides access to Pennsylvania Highways 5 and 290, and staying straight places traffic on Bayfont Parkway, a surface road.

My photo of an Interstate 79 marker comes from a surface road that meets an interchange in Charleston, West Virginia. The interchange occurs along Interstate 77, at a point along that Interstate right between the southern end of Interstate 79 and the point where it joins Interstate 64.  The sign assembly depicted faces southeast, pointing out the northbound onramp to Interstate 77, and that Interstate 79 can be accessed by using the northbound side of Interstate 77.  This photo was taken as part of the Virginia trip in April, 2021; I used this photo for my Interstate 64 route marker, too.
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