RV Travel Restrictions due to snow on PA interstates

Yeah, it's a relatively new route and runs up through State College and towards Williamsport. It "officially" ends in between those two places, but then if you continue north from W'port on US 15 towards Corning, as soon as you cross over the PA/NY border, it becomes I-99 again...odd.

Wikipedia says "Unlike most Interstate Highway numbers, which were assigned by the American Association of State Highway and Transportation Officials (AASHTO) to fit into a grid, I-99's number was written into Section 332 of the National Highway System Designation Act of 1995 by Bud Shuster, then-chair of the U.S. House Committee on Transportation and Infrastructure, the bill's sponsor, and the representative of the district through which the highway runs. I-99 violates the AASHTO numbering convention associated with Interstate Highways, since it lies east of I-79 but west of I-81."

Here's the Wiki map...

My mistake. It number implies it should be along the far east coast east of I 95, just when you think you understand the federal highway numbering system they throw one like this at you.

jcsb wrote:
There is no route I99 in PA

I believe you need a newer map :)

There is a Interstate 99 in Pennsylvania. I drive it numerous times a year. Runs north from the PA Turnpike (I70 up past I80. Parts of it are still known as US 220. I believe the exit on I80 where it intersects is around mile post 160ish.

There is no route I99 in PA