Interstate/US route pairs

[Revive 755]

(This thread is inspired from the I-22 thread)

How many cases are there where an interstate and a companion US route have a pairing where the numbers for the US route and interstate are flipped?  Examples:

* I-78 and US 22/Future I-22 and US 78
* I-10 and US 90/I-90 and former US 10.
* I-40 and US 70/I-70 and US 40

[Grzrd]

and they add up to 100!

Above quote from I-22 thread.  Is 100 the ideal sum for a pair since US route numbers increase in one direction while interstate numbers increase in the other direction?  In other words, the average of the two is 50, which would theoretically be right in the middle of the country.

[jemacedo9]

thanks for starting this thread!!! 

[Grzrd]

...just realized that it's interesting that I-22 and US 78 are linked, just as I-78 and US 22 (PA and NJ) are linked...maybe a new topic/thread?

Thank you for the original observation!

[national highway 1]

I-20 & US 80 from Kent TX, to Dallas
I-70 & US 30 in Breezewood, PA

[corco]

I-84 and US-20 (Idaho)
US-84 and I-20 (Texas)

I-25 and US-26 (Wyoming)
I-26 and US-25 (North Carolina)

[hbelkins]

I-64 and US 40 are best buddies in St. Louis.

In Arkansas and also in North Carolina, I-40 and US 64 are pretty chummy.

[mightyace]

US 40 is also chummy with I-70 in Indiana and Ohio, among other places.

While down here in TN, US 70 roughly parallels I-40.

[Alps]

I-25 and US-26 (Wyoming)
I-26 and US-25 (North Carolina)

I vote this one the winner.

[Hot Rod Hootenanny]

US 20 with I-90 from Chicago to Boston
US 30 with I-80 from Omaha (sort of) to Western Wyoming
Lincoln Highway with I-80 from coast to coast (NYC to SF)
US 30 with I-76 from Ohio to Philadelphia

Going back to the pairs.
I-40 with US 270 in Oklahoma
US 40 intersects with I-270 near St. Louis and Columbus.

[NJRoadfan]

US-46 parallels I-80 for nearly its entire length in NJ. Gotta love those single state US routes with out of grid numbers.

[agentsteel53]

US-10 and I-90 (former route, Montana-Washington - still signed at the Missoula airport so that's gotta count for something!)
I-10 and US-90 (they run together for a while from Jacksonville to New Orleans and again from Lafayette to San Antonio, and are multiplexed in Lake Charles and likely other places I have yet to think of)

[ctsignguy]

I dont know about the E-W pairings, but one thing i noticed was  a few of the northeast pairings seemed to add to 96

I-95 - US 1
I-91 - US 5
I-93 - US 3
I-87 - US 9

[codyg1985]

I-81/US 11 for most of I-81's length
I-59/US 11 for I-59's entire length
I-75/US 11 in Tennessee between Chattanooga and Knoxville
I-65/US 31 south of Indianapolis
I-75/US 41 south of Chattanooga
I-55/US 51 south of Memphis

...starting to see a pattern here?

[SSOWorld]

Too bad there's no I-51 or US 39 (I-39 = US 51 for its length.)

[hm insulators]

In the Phoenix area, US 60 briefly pairs up with two interstates. Coming in from the east, US 60 meets I-10 in Tempe and for about five miles or so, it shares the road with I-10 as it passes through Phoenix. At the first I-17/I-10 interchange, US 60 follows I-17 as the interstate heads west for a couple of miles, then suddenly elbows north and crosses I-10 a second time. Just after crossing I-10 the second time, US 60 departs from I-17, jogs briefly west on Thomas Road, then picks up the major diagonal called Grand Avenue and stays on this diagonal all the way to Wickenburg, about fifty miles northwest of Phoenix.

[SteveG1988]

I do not know if this counts.

US-130 and I-295, 130 is the original name for 295, before the late 50s. Two sections of roads were built as the US-130 freeway, 1948 and 1954 or so i beleive. the 130/295 multiplex is a side effect of this, they meet once, and never again except for junctions.

[brownpelican]

I-10 and US-90 (they run together for a while from Jacksonville to New Orleans and again from Lafayette to San Antonio, and are multiplexed in Lake Charles and likely other places I have yet to think of)

Houston

[Henry]

How's this for an interesting pair: I-77 & US 21. Not only is the sum 98, but all three of those numbers are multiples of 7!