Interstate numbers that will likely never be used

[Scott5114]

46, 48, 50, 52, 54, 56, 58, 60, 62. Too close to similar US routes.

One of these numbers will have to be used for the Enid OK—Springdale AR interstate that was signed into law since this thread was created.

[Molandfreak]

46, 48, 50, 52, 54, 56, 58, 60, 62. Too close to similar US routes.

One of these numbers will have to be used for the Enid OK—Springdale AR interstate that was signed into law since this thread was created.

46, 48, and 58 also don't really leave the east coast/Appalachia, so those could be used elsewhere without duplicating them.

[Big John]

Interstate 420
Interstate 666

sign theft may be an issue with them

Though 420 was once proposed for Atlanta.

[jlam]

Interstate 420
Interstate 666

sign theft may be an issue with them

Though 420 was once proposed for Atlanta.

And Monroe, LA

[SkyPesos]

Interstate 420
Interstate 666

sign theft may be an issue with them

I doubt it. If sign theft is a big issue, I-69 wouldn't be quintupled in length, and instead, some other number chosen for the NAFTA interstate.

[James]

IMO, I-6 should be the designation for I-49's "southern" extension from Lafayette to New Orleans.

[Avalanchez71]

28, 34, 36, 38. I don't think this would really fit anywhere between existing routes.

You do realize that how the grid is set up, all of these could theoretically fall within North Carolina...right?

Those numbers could work on US 74 Asheville to Wilmington or US 72 Memphis-Chattanooga.

46, 48, 50, 52, 54, 56, 58, 60, 62. Too close to similar US routes.

US 46 is not in its grid position, so an I-46 could work. I have I-46 on the southern I-87 in one of my fictional maps. I have I-48 on Joplin-Wichita on a fictional map, but that corridor isn't even 4 laned, so it most likely wouldn't be an interstate in real life. I-56 or I-58 could be used on the Bluegrass Pkwy in KY. I-62 could go on US 460 in VA if for some reason, the state wanted to revive the old southern alternative of I-64 as a new interstate. On my fictional map, I have I-62 on I-70 between Cove Fort and Green river, with I-70 rerouted on I-80 west to SF.

US 400 does a fine job as is.  No need to turn it into I-48.

[SkyPesos]

28, 34, 36, 38. I don't think this would really fit anywhere between existing routes.

You do realize that how the grid is set up, all of these could theoretically fall within North Carolina...right?

Those numbers could work on US 74 Asheville to Wilmington or US 72 Memphis-Chattanooga.

46, 48, 50, 52, 54, 56, 58, 60, 62. Too close to similar US routes.

US 46 is not in its grid position, so an I-46 could work. I have I-46 on the southern I-87 in one of my fictional maps. I have I-48 on Joplin-Wichita on a fictional map, but that corridor isn't even 4 laned, so it most likely wouldn't be an interstate in real life. I-56 or I-58 could be used on the Bluegrass Pkwy in KY. I-62 could go on US 460 in VA if for some reason, the state wanted to revive the old southern alternative of I-64 as a new interstate. On my fictional map, I have I-62 on I-70 between Cove Fort and Green river, with I-70 rerouted on I-80 west to SF.

US 400 does a fine job as is.  No need to turn it into I-48.

I can tell exactly where you stopped reading my post here

[JoePCool14]

Interstate 420
Interstate 666

sign theft may be an issue with them

I doubt it. If sign theft is a big issue, I-69 wouldn't be quintupled in length, and instead, some other number chosen for the NAFTA interstate.

I agree. We have US-69, many states have state routes numbered 69, there are numerous exit 69's throughout the country, etc. Some locations are likely more targeted than others, but most people aren't that childish to steal a road sign because of "funny sex number".

[sturmde]

Interstate 420
Interstate 666

sign theft may be an issue with them

I doubt it. If sign theft is a big issue, I-69 wouldn't be quintupled in length, and instead, some other number chosen for the NAFTA interstate.

I agree. We have US-69, many states have state routes numbered 69, there are numerous exit 69's throughout the country, etc. Some locations are likely more targeted than others, but most people aren't that childish to steal a road sign because of "funny sex number".

Laughs in Ohio SR 235 extension.  (Originally SR 69 from I-75 intersection in downtown Dayton north to its end at SR 65 near Otsego.)

[US 89]

Interstate 420
Interstate 666

sign theft may be an issue with them

I doubt it. If sign theft is a big issue, I-69 wouldn't be quintupled in length, and instead, some other number chosen for the NAFTA interstate.

I agree. We have US-69, many states have state routes numbered 69, there are numerous exit 69's throughout the country, etc. Some locations are likely more targeted than others, but most people aren't that childish to steal a road sign because of "funny sex number".

Utah entirely renumbered their SR 69 to 38 due to thefts, so it may be a bigger issue than you think... although a big contributing factor in that case is that it was pretty close to Utah State and Weber State Universities, and hence had a higher volume of college students who are probably more likely to steal said signs.

I doubt any route will ever be numbered 420 again. DOTs can't even keep 420 mileposts up, and Colorado's attempt at a solution (MILE 419.99) didn't work either.

[Roadgeekteen]

I-100, I-200 etc

They would be spurs of I-00 which isn't happening.

[Flint1979]

I-6 is a possibility for that Freer-Corpus Christi route in Texas, even more so if the entire SH 44 route from US 83 (which could be future I-27) to CC is upgraded in the future.

I-34 or 36 could be routed on a future upgrade of US 74. Never doubt NC's ability to add new Interstates. 

I-9 is a possibility in California.

Just curious where 9 could fit in California. I thought if CA 99 was an interstate it'd be 7.

Could be 7 or 9. Either number fits.

The CA 99 corridor would probably be I-7. I saw someone post here one time, "They need to renumber the western I-84 as I-82 and I-82 as either I-7 or I-9, since it mostly runs north-south."

82 drives me nuts. It's a north-south route!

It's also north of I-84.

[ethanhopkin14]

46, 48, 50, 52, 54, 56, 58, 60, 62. Too close to similar US routes.

I don't know, somewhere out there is a city with a really stupid football team that might have same numbered interstate and US routes really close together.

Go Bears!

I think we can put the US vs Interstates having the same number in the same state argument to rest.  It made sense when the system was first starting out to reduce confusion, but so much time has gone by now, and nobody cares anymore. 

[ethanhopkin14]

For 3di, most 9xx won't be used.

8xx: mostly won't be used, but some that I could see being used in the future, in addition to the currently used ones, are 870 (Columbia Bypass), 864 (VA 288? After all, 864 is 288*3), 875 (Chattanooga Eastern Bypass).

7xx: like with 9xx, it's unlikely.

5xx: For some reason, states love to use 5xx over 1xx or 3xx for 3di spurs, which means that 25, 45 and 70 are the only x0 and x5 without a 5xx 3di. Only one that have a possibility to be a future interstate is 570.

Interstate 820 in Ft Worth, TX

[hotdogPi]

I think we can put the US vs Interstates having the same number in the same state argument to rest.  It made sense when the system was first starting out to reduce confusion, but so much time has gone by now, and nobody cares anymore.

It still matters if the parallel surface road is a US route, e.g. I-64 can't become I-60 where it's parallel with US 60.

[ethanhopkin14]

I think we can put the US vs Interstates having the same number in the same state argument to rest.  It made sense when the system was first starting out to reduce confusion, but so much time has gone by now, and nobody cares anymore.

It still matters if the parallel surface road is a US route, e.g. I-64 can't become I-60 where it's parallel with US 60.

What about I-41 and US-41.  They are cosigned or parallel the whole way.

[1995hoo]

I think we can put the US vs Interstates having the same number in the same state argument to rest.  It made sense when the system was first starting out to reduce confusion, but so much time has gone by now, and nobody cares anymore.

It still matters if the parallel surface road is a US route, e.g. I-64 can't become I-60 where it's parallel with US 60.

Methinks you are confusing the words "can't" and "shouldn't":

https://goo.gl/maps/UNohoxjA3iX1UWyF6

[hotdogPi]

I think we can put the US vs Interstates having the same number in the same state argument to rest.  It made sense when the system was first starting out to reduce confusion, but so much time has gone by now, and nobody cares anymore.

It still matters if the parallel surface road is a US route, e.g. I-64 can't become I-60 where it's parallel with US 60.

What about I-41 and US-41.  They are cosigned or parallel the whole way.

They're the same road. You don't have I-41 and US 41 as two different but parallel routes.

[ethanhopkin14]

I think we can put the US vs Interstates having the same number in the same state argument to rest.  It made sense when the system was first starting out to reduce confusion, but so much time has gone by now, and nobody cares anymore.

It still matters if the parallel surface road is a US route, e.g. I-64 can't become I-60 where it's parallel with US 60.

What about I-41 and US-41.  They are cosigned or parallel the whole way.

They're the same road. You don't have I-41 and US 41 as two different but parallel routes.

I still don't think it matters.  Again that rule was put in placed back when the interstates were brand new and everyone was trying to get used to differentiate them from their US counterparts.  Its been 65 years.  People are now more used to the system and know there is a difference between US-60 and I-60.

[US20IL64]

For an I-60, use I-58 and also I-48 for 50. I say.

Principle 0 and 5 routes shouldn't be duplicated with US #'s.
41 isn't principle.

[SkyPesos]

For an I-60, use I-58 and also I-48 for 50. I say.

More like for I-50 and I-60, use I-44 and I-64, when the interstate system was first laid out.

I-70 theoretically could've been numbered as I-60, if the planners back then had no issue with it sharing a state (Missouri), but not meeting with US 60. Then, I-80->70, 90->80, and 94->90. Coincidentally, this would have each x0 and one of its parallel US route add up to 100 (I-60+US 40, 70+30, 80+20, 90+10).

[skluth]

Interstate 420
Interstate 666

sign theft may be an issue with them

I doubt it. If sign theft is a big issue, I-69 wouldn't be quintupled in length, and instead, some other number chosen for the NAFTA interstate.

I agree. We have US-69, many states have state routes numbered 69, there are numerous exit 69's throughout the country, etc. Some locations are likely more targeted than others, but most people aren't that childish to steal a road sign because of "funny sex number".

Utah entirely renumbered their SR 69 to 38 due to thefts, so it may be a bigger issue than you think... although a big contributing factor in that case is that it was pretty close to Utah State and Weber State Universities, and hence had a higher volume of college students who are probably more likely to steal said signs.

I doubt any route will ever be numbered 420 again. DOTs can't even keep 420 mileposts up, and Colorado's attempt at a solution (MILE 419.99) didn't work either.

Virginia doesn't post VA 420. It's simply marked Seminary Road or Janneys Lane.

[ethanhopkin14]

Interstate 420
Interstate 666

sign theft may be an issue with them

I doubt it. If sign theft is a big issue, I-69 wouldn't be quintupled in length, and instead, some other number chosen for the NAFTA interstate.

I agree. We have US-69, many states have state routes numbered 69, there are numerous exit 69's throughout the country, etc. Some locations are likely more targeted than others, but most people aren't that childish to steal a road sign because of "funny sex number".

Utah entirely renumbered their SR 69 to 38 due to thefts, so it may be a bigger issue than you think... although a big contributing factor in that case is that it was pretty close to Utah State and Weber State Universities, and hence had a higher volume of college students who are probably more likely to steal said signs.

I doubt any route will ever be numbered 420 again. DOTs can't even keep 420 mileposts up, and Colorado's attempt at a solution (MILE 419.99) didn't work either.

Virginia doesn't post VA 420. It's simply marked Seminary Road or Janneys Lane.

Mile Marker 420 on Interstate 20 in Texas is/was imbedded into the concrete pillar of a bridge, so if you steel the sign you have to steel the whole pier. 

I-35E has a mile marker 420 in Dallas, but either it's missing because it was hit, been stolen or TxDOT said "we aren't signing this anymore."
It should be somewhere around here.

I-10 also has a mile marker 420 in Texas, but it is signed normally and never has a theft issue, mainly because it is so hard to get to.

[MATraveler128]

There were two cancelled I-420's that were never built. There was the proposed I-420 in Atlanta, but I'm sure you all knew that. Then there was another one cancelled in Monroe, Louisiana.