Interstate 99 north of Williamsport

[vdeane]

I was just thinking today (while moving some of my images from US 15 to I-99) that if US 15 ever goes away, what happens to Business US 15?  BL 99?

[pderocco]

I was just thinking today (while moving some of my images from US 15 to I-99) that if US 15 ever goes away, what happens to Business US 15?  BL 99?

Sounds logical. I just drove US-15-BL in Mansfield, and that could just as easily be signed as I-99-BL. But is AASHTO involved in these decisions, and might they hold the two designations to different standards?

[cockroachking]

I was just thinking today (while moving some of my images from US 15 to I-99) that if US 15 ever goes away, what happens to Business US 15?  BL 99?

Sounds logical. I just drove US-15-BL in Mansfield, and that could just as easily be signed as I-99-BL. But is AASHTO involved in these decisions, and might they hold the two designations to different standards?

I didn't think AASHTO SCOURN had standards anymore...

[LeftyJR]

Trailblazing signage along the roadway are up along 220 between 80 and Williamsport, though many BGS are not up yet. They are sitting in Salona.

[The Ghostbuster]

It appears Google Maps has removed the Interstate 99 shield from the US 15 corridor between Interstate 180/US 220 and the New York State Line. They'll probably put it back once Interstate 99 is signposted along US 15.

[jmacswimmer]

I was just thinking today (while moving some of my images from US 15 to I-99) that if US 15 ever goes away, what happens to Business US 15?  BL 99?

Sounds logical. I just drove US-15-BL in Mansfield, and that could just as easily be signed as I-99-BL. But is AASHTO involved in these decisions, and might they hold the two designations to different standards?

PA 60 BUS was similarly redesignated to I-376 BL alongside the I-376 extension, so seems likely PennDOT would also make the change here based on that precedent.

[Mr_Northside]

I was just thinking today (while moving some of my images from US 15 to I-99) that if US 15 ever goes away, what happens to Business US 15?  BL 99?

Sounds logical. I just drove US-15-BL in Mansfield, and that could just as easily be signed as I-99-BL. But is AASHTO involved in these decisions, and might they hold the two designations to different standards?

PA 60 BUS was similarly redesignated to I-376 BL alongside the I-376 extension, so seems likely PennDOT would also make the change here based on that precedent.

Wouldn't rule that out.  I could also see them just extending PA-660, or even just de-numbering it.

[74/171FAN]

PennDOT - District 3 News: Shapiro Administration Expands Interstate Network with the New Designation of Interstate 99 in Lycoming and Tioga Counties

[The Ghostbuster]

Now if they could just get US 220 upgraded between Interstate 80 and Interstate 180.

[TheHighwayMan3561]

I know it's not ideal routing-wise, but why not just replace I-180 at this point with the rest of 99 and be done?

[The Ghostbuster]

While replacing Interstate 180 with Interstate 99 might seem logical, that would make 99 a very indirect Interstate. It would also necessitate a 51-mile duplex with Interstate 80, compared to a 17-mile duplex routing it more directly to follow US 220 to Williamsport. Plus, some of 220s exits are numbered via Interstate 99's mileage, so obviously the 220 alignment will be followed, someday.

[Rothman]

While replacing Interstate 180 with Interstate 99 might seem logical

I question the logic of anyone who thinks that is logical.

[Beltway]

.

I know it's not ideal routing-wise, but why not just replace I-180 at this point with the rest of 99 and be done?

We now have Interstate highway connectivity between I-80 and I-86, even though there are two separate numbers. That is a major achievement and something to celebrate.

[Mr. Matté]

^ TIL 90 & 81 are chopped liver

[pderocco]

While replacing Interstate 180 with Interstate 99 might seem logical, that would make 99 a very indirect Interstate. It would also necessitate a 51-mile duplex with Interstate 80, compared to a 17-mile duplex routing it more directly to follow US 220 to Williamsport. Plus, some of 220s exits are numbered via Interstate 99's mileage, so obviously the 220 alignment will be followed, someday.

The main point is that people would continue to use US-220, even with the short expressway segment.

[The Ghostbuster]

Apple Maps now shows the US 15 freeway as also being Interstate 99 north of Williamsport. I'm not sure how long the app has posted it as such.

[74/171FAN]

PennDOT - District 3 News: PennDOT Announces Additional Sign Work, Progress on Interstate 99 Corridor in North Central Pennsylvania

[74/171FAN]

Photos in both directions from 8/1/2026