Signed, but not "official FHWA" Interstate routes

[NE2]

https://www.dot.ny.gov/divisions/operating/oom/transportation-systems/repository/2012%20tour-bk.pdf

From that log it looks like I-495 and NY 495 are multiplexed with each other for a while.  Interesting.

Look more carefully. According to the log, I-495 is QMT to I-278 and I-678 to NY 25, while NY 495 is only I-278 to I-678.

[vdeane]

I will give you that one... but you're also the only roadgeek I know of to use that log.  I should mention that NY's touring route system and NY's state route system are NOT the same thing.  The log I mentioned (and is also used for the clinched highway mapping site) has it as a continuous road.

That log isn't even entirely right... the touring route NY 12E ends at NY 12F in Paddy Hill, but the log has it end at NY 12 in Watertown as the state route NY 12E does!  There might be others, but they're harder to find as most differences are in routing and not endpoints.

I wouldn't mind seeing the FHWA route log... the only one I found simply listed how long each interstate is, and I have no desire to measure everything out in Google Maps.

[NE2]

Comparing the FHWA mileages with the NYSDOT traffic log, the FHWA figure matches the 2012 touring route book description.

[kendancy66]

I-270 Spur in MD.  Is spur an official designation like business route or alternate? 

[Revive 755]

Is the Chicago Skyway still posted as "To I-90" and is it actually part of the interstate system?

Not sure about assurance markers, but the on-ramps are signed "TO I-90". Internally, it is part of the system.

Last time I was there it was signed TO I-90/94.

At least one of the overheads on the SB Ryan has been changed having it signed as I-90.

As for a signed but not official, it seems I-64 west of I-270 in Missouri was not officially approved for many years, but still mostly signed as a full interstate.

[Stratuscaster]

If I recall, the BGS' on the Ryan (and the IN Toll Road for that matter) always said "I-90 Chicago Skyway" - only the trailblazers along the Skyway were signed as "TO I-90" (EB) or "TO I-90/94" (WB).

[Brandon]

If I recall, the BGS' on the Ryan (and the IN Toll Road for that matter) always said "I-90 Chicago Skyway" - only the trailblazers along the Skyway were signed as "TO I-90" (EB) or "TO I-90/94" (WB).

According to IDOT and FHWA, it is I-90.  According to the City of Chicago, it isn't.  I'm inclined to go with IDOT and FHWA on this one.

[ClarkE]

State Road 265 in Jeffersonville, Indiana has blue I-265 mile markers on the sides of the road, even on the two-lane portion.

[cpzilliacus]

I-270 Spur in MD.  Is spur an official designation like business route or alternate? 

It's I-270Y in the Maryland State Highway Administration's Montgomery County section of the Highway Location Reference.