3 di's

[ethanhopkin14]

Maybe some of these questions have been answered here and there, but I'll lump them together:

1) What is the most re-used 3di from state to state?

2) What parent route spawns the most 3di?

3) Does any parent route have the same 3di in every state it goes through?

4) What states don't have any 3di's?

5) In your opinion, what's a good example of 3di overkill? (I am not talking about Los Angeles and all of it's 3di, they can justify it.  I am talking about Little Rock, AR with 3 3di's and a 193,000 population to go with it)

6) Why does the Minneapolis/St. Paul beltway have 2 numbers?

[CNGL-Leudimin]

1) I-295 spawns a total of 8 times

2) Definitely I-95 with all those 3dis it has in the Northeast. It currently has a whooping 33 spur routes (2 of them, I-595 MD and I-495 ME, are unsigned), with another one expected to come into existence soon (I-795 FL). A further 6 no longer exist (most recently I-895 NY and the short-lived I-495 NC, which never connected to I-95) and another 4 were never built.

3) I-5 has a I-405 in every state it passes through (I-205 also exists in all 3 states I-5 passes through, but there are only two I-205s). And technically, any Intrastate 2di with an associated 3di counts .

4) IIRC New Mexico doesn't even know what a 3di is. Arizona doesn't have one, but had some planned at one point. Wyoming shouldn't even have one.

5) Hennepin, Illinois and Cheyenne, Wyoming

6) I believe it's due to its asymmetry. I-694 is the most suitable bypass for through traffic on I-94, I-494 is way longer.

The first four questions can be answered with a quick look to Wikipedia.

[webny99]

Why does the Minneapolis/St. Paul beltway have 2 numbers?

They probably looked at the cities with 3- and 4- number beltways and decided they could do better.

[ethanhopkin14]

1) I-295 spawns a total of 8 times

2) Definitely I-95 with all those 3dis it has in the Northeast. It currently has a whooping 33 spur routes (2 of them, I-595 MD and I-495 ME, are unsigned), with another one expected to come into existence soon (I-795 FL). A further 6 no longer exist (most recently I-895 NY and the short-lived I-495 NC, which never connected to I-95) and another 4 were never built.

3) I-5 has a I-405 in every state it passes through (I-205 also exists in all 3 states I-5 passes through, but there are only two I-205s). And technically, any Intrastate 2di with an associated 3di counts .

4) IIRC New Mexico doesn't even know what a 3di is. Arizona doesn't have one, but had some planned at one point. Wyoming shouldn't even have one.

5) Hennepin, Illinois and Cheyenne, Wyoming

6) I believe it's due to its asymmetry. I-694 is the most suitable bypass for through traffic on I-94, I-494 is way longer.

The first four questions can be answered with a quick look to Wikipedia.

The first 4 questions on Wikipedia only yield New York having a complete set of I-x90 within it's state.  Plus, it's Wikipedia.

[ethanhopkin14]

1) I-295 spawns a total of 8 times

2) Definitely I-95 with all those 3dis it has in the Northeast. It currently has a whooping 33 spur routes (2 of them, I-595 MD and I-495 ME, are unsigned), with another one expected to come into existence soon (I-795 FL). A further 6 no longer exist (most recently I-895 NY and the short-lived I-495 NC, which never connected to I-95) and another 4 were never built.

3) I-5 has a I-405 in every state it passes through (I-205 also exists in all 3 states I-5 passes through, but there are only two I-205s). And technically, any Intrastate 2di with an associated 3di counts .

4) IIRC New Mexico doesn't even know what a 3di is. Arizona doesn't have one, but had some planned at one point. Wyoming shouldn't even have one.

5) Hennepin, Illinois and Cheyenne, Wyoming

6) I believe it's due to its asymmetry. I-694 is the most suitable bypass for through traffic on I-94, I-494 is way longer.

The first four questions can be answered with a quick look to Wikipedia.

I think I should have prefaced #3 better.  I am not including 3di's that are one route that cross a state line, nor a 3di that is child of an intrastate interstate.   

[bassoon1986]

3. I forgot there's a 405 in each state for I-5. Not all of them, but out of 8 states for I-10, 5 of them have an I-110.


iPhone

[Revive 755]

5) In your opinion, what's a good example of 3di overkill? (I am not talking about Los Angeles and all of it's 3di, they can justify it.  I am talking about Little Rock, AR with 3 3di's and a 193,000 population to go with it)

Little Rock has four:

1) I-430
2) I-440
3) I-530 (granted this one is a spur to points outside the region)
4) I-630

Could have been a fifth had the US 67 corridor north of Little Rock been given a 3di designation.

While the core city may only be a little shy of 200,000 the whole metro has a population of 738,344 per Wikipedia.

[Scott5114]

The first 4 questions on Wikipedia only yield New York having a complete set of I-x90 within it's state.  Plus, it's Wikipedia.

You don't trust the random roadgeeks on Wikipedia, so you ask...the random roadgeeks on AARoads?

[ethanhopkin14]

The first 4 questions on Wikipedia only yield New York having a complete set of I-x90 within it's state.  Plus, it's Wikipedia.

You don't trust the random roadgeeks on Wikipedia, so you ask...the random roadgeeks on AARoads?

Yes.  Maybe I wanted to have a discussion among roadgeeks instead of staring at Wikipedia for yet another day during a pandemic.  It's getting a bit depressing how much Wikipedia I have been viewing. 

[ozarkman417]

The first 4 questions on Wikipedia only yield New York having a complete set of I-x90 within it's state.  Plus, it's Wikipedia.

You don't trust the random roadgeeks on Wikipedia, so you ask...the random roadgeeks on AARoads?

Should you take a look at the edit history of some of the articles, you may find some familiar names...

[TheHighwayMan3561]

The first 4 questions on Wikipedia only yield New York having a complete set of I-x90 within it's state.  Plus, it's Wikipedia.

You don't trust the random roadgeeks on Wikipedia, so you ask...the random roadgeeks on AARoads?

Yes.  Maybe I wanted to have a discussion among roadgeeks instead of staring at Wikipedia for yet another day during a pandemic.  It's getting a bit depressing how much Wikipedia I have been viewing. 

Most of those Wiki editors are the same people who contribute here.

[I-55]

6) I believe it's due to its asymmetry. I-694 is the most suitable bypass for through traffic on I-94, I-494 is way longer.

Probably the same reason St. Louis still has I-270 and I-255: each route serves its parent interstate better than the other. Both are straight shots between parent junctions and even though they form a complete loop, that loop is flat on two sides and visibly appears to be two different routes.

[Bruce]

The pandemic has been pretty good at revving up my Wikipedia productivity.

Some recent projects: I-5 in Washington, I-205 in Portlandia and Vantucky, and I-405 in Washington. The latter two are not yet complete, as I am slowly sifting through newspaper coverage to find exact opening dates and other information to flesh out the history sections.

[ilpt4u]

6) I believe it's due to its asymmetry. I-694 is the most suitable bypass for through traffic on I-94, I-494 is way longer.

Probably the same reason St. Louis still has I-270 and I-255: each route serves its parent interstate better than the other. Both are straight shots between parent junctions and even though they form a complete loop, that loop is flat on two sides and visibly appears to be two different routes.

One could argue I-255 serves both its parent routes better, as (despite current Controls) Thru Old US 66/I-44 to/from the SW and Old US 66/I-55 to/from the NE is better to use I-255 and the little bit of I-270 between I-255/I-55 and I-44 to go around St Louis to the south and east

[kkt]

5) In your opinion, what's a good example of 3di overkill? (I am not talking about Los Angeles and all of it's 3di, they can justify it.  I am talking about Little Rock, AR with 3 3di's and a 193,000 population to go with it)

S.F. Bay Area, with only one interstate to play off of:

280
380
formerly 480
580
680
780
880
980

[michravera]

5) In your opinion, what's a good example of 3di overkill? (I am not talking about Los Angeles and all of it's 3di, they can justify it.  I am talking about Little Rock, AR with 3 3di's and a 193,000 population to go with it)

S.F. Bay Area, with only one interstate to play off of:

280
380
formerly 480
580
680
780
880
980

... and let's not forget I-238. ... and there was also an 880 in Sacramento (transferred to mainline I-80 and the old route transferred to I-305). So, despite not having 180 available (It's a CA SR in Fresno) I-80 spawned a total of 10 or 11 3dis! (you might think that I-305 is double counted). 238 should definitely count (Since ASHTO suggested 180 for it before recognizing the duplication and approving 238) and the two incarnations of 880 should be double counted. In addition, CASR-51 is signed as "Business 80", so maybe it should count as well. That would make 12 in one state! ... and the mainline I-80 is only 200 miles or so.

[bassoon1986]

You could say New Orleans, it has 4. But I think most are justified. It's limited by geography to only have one 2di, so most of the 3dis are for crossing bodies of water.


iPhone

[sprjus4]

You could say New Orleans, it has 4. But I think most are justified. It's limited by geography to only have one 2di, so most of the 3dis are for crossing bodies of water.

New Orleans only has 3 - I-310, I-510, and I-610.

Unless you're counting the hidden I-910.

[bassoon1986]

You could say New Orleans, it has 4. But I think most are justified. It's limited by geography to only have one 2di, so most of the 3dis are for crossing bodies of water.

New Orleans only has 3 - I-310, I-510, and I-610.

Unless you're counting the hidden I-910.

Yes. That would make 4.


iPhone

[Revive 755]

6) I believe it's due to its asymmetry. I-694 is the most suitable bypass for through traffic on I-94, I-494 is way longer.

Probably the same reason St. Louis still has I-270 and I-255: each route serves its parent interstate better than the other. Both are straight shots between parent junctions and even though they form a complete loop, that loop is flat on two sides and visibly appears to be two different routes.

I'm staying with my hypothesis that it was a fad earlier on to use multiple numbers for beltways, considering previous proposals for using both I-215 and I-415 for Salt Lake City, and I-281 and I-481 for Syracuse.

[ilpt4u]

Didn't the St Louis Beltway have a segment numbered I-244 originally? I believe between I-70 in MO and either I-44 or I-55 in MO? Or, basically the West Side?

[dvferyance]

5. I-680 and I-880 in Iowa.

[DJ Particle]

... and let's not forget I-238. ... and there was also an 880 in Sacramento (transferred to mainline I-80 and the old route transferred to I-305). So, despite not having 180 available (It's a CA SR in Fresno) I-80 spawned a total of 10 or 11 3dis! (you might think that I-305 is double counted). 238 should definitely count (Since ASHTO suggested 180 for it before recognizing the duplication and approving 238) and the two incarnations of 880 should be double counted. In addition, CASR-51 is signed as "Business 80", so maybe it should count as well. That would make 12 in one state! ... and the mainline I-80 is only 200 miles or so.

Which begs anothr question...how many states have a mainline interstate which runs less miles in its state than its 3dis?  I trust I-80 in CA easily meets that criteria.  I'd also nominate I-95 in MA.

EDIT:  Also...are there any other situations where a 3di enters a state its parent doesn't?  All I can think of off the top of my head is I-535 in WI.

[ilpt4u]

Which begs anothr question...how many states have a mainline interstate which runs less miles in its state than its 3dis?  I trust I-80 in CA easily meets that criteria.  I'd also nominate I-95 in MA.

I assume that is supposed to be I-95 in MD, not MA? Guess it could be either. If unsigned I-595 in MD is counted, it probably helps the case (No, I haven't measured)

I would also suggest I-95 in DC, but DC isn't really a state

I-95 in NY should qualify, I would think. I-78 in NY really qualifies

Trying a bigger state, I thought I-35 might pull this off in Kansas. But it is 215 miles, and its 3dis in KS add up to ~155 miles. 60 miles isn't too big a number, tho

EDIT:  Also...are there any other situations where a 3di enters a state its parent doesn't?  All I can think of off the top of my head is I-535 in WI.

I-129 and Nebraska

I-275 and Indiana

At present, one might argue I-269 around Memphis. I don't think I-69 is signed yet officially in TN

[hotdogPi]

Which begs anothr question...how many states have a mainline interstate which runs less miles in its state than its 3dis?  I trust I-80 in CA easily meets that criteria.  I'd also nominate I-95 in MA.

I assume that is supposed to be I-95 in MD, not MA? Guess it could be either. If unsigned I-595 in MD is counted, it probably helps the case (No, I haven't measured)

I-495 in MA is longer than I-95 in MA.