Random facts about interstates and US routes

[SkyPesos]

It appears as though most 2di Interstates ending in 2 or 7 are shorter and/or intrastate (or at least near-intrastate) routes.

You have: 2, 12, 17, 27, 37, (Future) 42, 72, 82, (Northern) 87, and 97.

I-77 seems to be the exception to this, as well as I-57 with its extension to Little Rock.

There are only 4 interstates that end in x3.

43, 73, 83, 93?

[SkyPesos]

Speaking of x2s, of the 17 2dus routes with the number 2 in it (20, 21, 22, 23, 24, 25, 26, 27, 29, 2, 12, 42, 52, 62, 72, 82, 92), 10 of them currently go, or formerly went, through Ohio (20, 21, 22, 23, 24, 25, 27, 42, 52, 62). Now, it would be interesting to see which state have the most 2dus routes with each number from 1-9.

[Crown Victoria]

The only 2-digit numbers never used on the US Routes are 39, 47, 86, and 88.

With 39, 86 (twice currently, thrice in total), and 88 (twice) in use on the Interstate system, that leaves 47 as the only 2-digit number never used on either the Interstates or the US Routes.

[plain]

There are currently four US routes signed on turnpikes: 51, 74, 301, 412.


I believe there was a US 30 Toll and a US 41 Toll that briefly existed in the late 1950's in IL.

US 278 in SC became toll free earlier this year.

[hotdogPi]

There are currently four US routes signed on turnpikes: 51, 74, 301, 412.

US 3 is on part of the Everett Turnpike, but only the free section.

[Mapmikey]

The only 2-digit numbers never used on the US Routes are 39, 47, 86, and 88.

With 39, 86 (twice currently, thrice in total), and 88 (twice) in use on the Interstate system, that leaves 47 as the only 2-digit number never used on either the Interstates or the US Routes.

US 86 has been explicitly requested at least twice...

Virginia in 1933 (became US 460 instead)
Alabama in more modern times (it is unclear where this was supposed to be)


Also, US 9 is on the Garden State Parkway

[SkyPesos]

Virginia in 1933 (became US 460 instead)

Besides US 412, another good one to use the US 68 number on, instead of the current, pretty wasteful, one with the number.

[Crown Victoria]

The only 2-digit numbers never used on the US Routes are 39, 47, 86, and 88.

With 39, 86 (twice currently, thrice in total), and 88 (twice) in use on the Interstate system, that leaves 47 as the only 2-digit number never used on either the Interstates or the US Routes.

US 86 has been explicitly requested at least twice...

Virginia in 1933 (became US 460 instead)
Alabama in more modern times (it is unclear where this was supposed to be)


Also, US 9 is on the Garden State Parkway

But 86 was never assigned as a US Route, leaving it unused.

[plain]

Also, US 9 is on the Garden State Parkway

Indeed, I often forget that SB US 9 must pay the toll at Great Egg Harbor.

[roadman65]

There are currently four US routes signed on turnpikes: 51, 74, 301, 412.

US 3 is on part of the Everett Turnpike, but only the free section.

US 4 is also on the free Spaulding Turnpike Section.

[US 89]

Also, US 9 is on the Garden State Parkway

Indeed, I often forget that SB US 9 must pay the toll at Great Egg Harbor.

I don't think that really counts though because it basically amounts to a bridge toll, and everywhere else US 9 joins the GSP does not require a toll.

If you count that, then you probably have to also count all the US highways that cross a toll bridge - US 1/9 on the GWB, US 6/202 on the Bear Mountain Bridge, US 101 over the Golden Gate...

[zachary_amaryllis]

For some reason, the small portion of Interstate 76 in Nebraska is signed north and south, despite having no interchanges in the state besides Interstate 80.

and nebraska has that oddity of when an interstate ends, the junction inherits the exit numbers of the interstate its joining with.

the end of 76 is exit 102, instead of 1 or 0.

[plain]

Also, US 9 is on the Garden State Parkway

Indeed, I often forget that SB US 9 must pay the toll at Great Egg Harbor.

I don't think that really counts though because it basically amounts to a bridge toll, and everywhere else US 9 joins the GSP does not require a toll.

If you count that, then you probably have to also count all the US highways that cross a toll bridge - US 1/9 on the GWB, US 6/202 on the Bear Mountain Bridge, US 101 over the Golden Gate...

Maybe, but then again it's a little more than a bridge toll considering that the last exit ramp on the Pkwy before it (Exit 30) is also tolled.

[Henry]

For some reason, the small portion of Interstate 76 in Nebraska is signed north and south, despite having no interchanges in the state besides Interstate 80.

and nebraska has that oddity of when an interstate ends, the junction inherits the exit numbers of the interstate its joining with.

the end of 76 is exit 102, instead of 1 or 0.

The eastern I-76 in NJ has exit numbers going the opposite direction, save for an eastbound Exit 354, which is a continuation of its numbering scheme in PA.

[Alps]

The following are the only 2-digit Interstates that stay within 90 degrees of their signed direction at all times:
19, 27, 57, 97
2, 12, 14 (ha), 16, 22, 42 (ha ha), 72 EB (WB breaks at I-55), 76 western, 86 western

Of these, four are multi-state though only 22 really has significant length in both. 57 is by far the longest.

[Evan_Th]

The following are the only 2-digit Interstates that stay within 90 degrees of their signed direction at all times:
19, 27, 57, 97
2, 12, 14 (ha), 16, 22, 42 (ha ha), 72 EB (WB breaks at I-55), 76 western, 86 western

Of these, four are multi-state though only 22 really has significant length in both. 57 is by far the longest.

What about I-39?

I-57 almost fails to qualify due to the due east-west stretch in Missouri just west of 55.  And, it looks like I-41 and I-43 just barely fail to qualify thanks to Milwaukee.

[kurumi]

US 1 in Florida (including the Keys) is only 19 miles longer than US 1 in Maine.

[hbelkins]

The western I-88 is one of the few single-state interstates that runs through a flat state. 

[Dirt Roads]

US-35 in West Virginia has gotten considerably shorter over time without getting truncated.

Silver Bridge (Point Pleasant) to US-60 Charleston, about 70 miles (original-1967)
New Silver Bridge (Kanauga) to US-60 St. Albans, about 45 miles (1969-2009)
New Silver Bridge (Kanauga) to CR-33 Scott Depot, about 37 miles (2009-2021?Maybe?)

I haven't seen the final tallies, but I suspect that when the four-lane is completed through Mason County that US-35 will be about half of its historical route length in the state.

[Max Rockatansky]

The western I-88 is one of the few single-state interstates that runs through a flat state. 

It's also haunted... 

[plain]

US-35 in West Virginia has gotten considerably shorter over time without getting truncated.

Silver Bridge (Point Pleasant) to US-60 Charleston, about 70 miles (original-1967)
New Silver Bridge (Kanauga) to US-60 St. Albans, about 45 miles (1969-2009)
New Silver Bridge (Kanauga) to CR-33 Scott Depot, about 37 miles (2009-2021?Maybe?)

I haven't seen the final tallies, but I suspect that when the four-lane is completed through Mason County that US-35 will be about half of its historical route length in the state.

That is definitely interesting

[SkyPesos]

US-35 in West Virginia has gotten considerably shorter over time without getting truncated.

Silver Bridge (Point Pleasant) to US-60 Charleston, about 70 miles (original-1967)
New Silver Bridge (Kanauga) to US-60 St. Albans, about 45 miles (1969-2009)
New Silver Bridge (Kanauga) to CR-33 Scott Depot, about 37 miles (2009-2021?Maybe?)

I haven't seen the final tallies, but I suspect that when the four-lane is completed through Mason County that US-35 will be about half of its historical route length in the state.

US 33 also got noticeably shorter in WV when it was moved from the Pomeroy-Mason Bridge over the Ohio River to the Ravenswood bridge it currently uses.

[ethanhopkin14]

Interstate 40 crosses four I-X7 interstates (planned for five with the I-57 extension).  Two of which terminate on their north end at I-40, and one terminates on it's south end at I-40.  I-X7 is the tied for third with I-X0 as the third most often repeated last digit in the system, behind X5(10) and X9(9)(just lacking CA-99 being re-signed as I-9).  Significant that it is repeated that often, yet only four cross the same transcontinental interstate.

[SkyPesos]

Interstate 40 crosses four I-X7 interstates (planned for five with the I-57 extension).  Two of which terminate on their north end at I-40, and one terminates on it's south end at I-40.  I-X7 is the tied for third with I-X0 as the third most often repeated last digit in the system, behind X5(10) and X9(9)(just lacking CA-99 being re-signed as I-9).  Significant that it is repeated that often, yet only four cross the same transcontinental interstate.

What's the 5th? I only counted 17, 27, future 57 and 77. Also, there are some near-misses with other x0 and x7, like 90 and 57 are 3 miles apart at their closest point (used to meet historically when 94 used the Skyway), 80 and 87 are 5 miles apart, and 70 and 97 are 10 miles apart.

Also, there's only two concurrencies between an x0 and x7: I-57/70 and I-87/90.

Speaking of concurrencies: I-64 loses exit number continuity at every one of its concurrencies (with I-57, 75, 77, 81 and 95) except the short concurrency with I-55 in MO. 

[jlam]

Interstate 40 crosses four I-X7 interstates (planned for five with the I-57 extension).  Two of which terminate on their north end at I-40, and one terminates on it's south end at I-40.  I-X7 is the tied for third with I-X0 as the third most often repeated last digit in the system, behind X5(10) and X9(9)(just lacking CA-99 being re-signed as I-9).  Significant that it is repeated that often, yet only four cross the same transcontinental interstate.

What's the 5th? I only counted 17, 27, future 57 and 77.

I-87's "southern" terminus is at I-40.