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Author Topic: Random facts about interstates and US routes  (Read 48620 times)

SkyPesos

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Re: Random facts about interstates and US routes
« Reply #300 on: April 08, 2022, 06:18:11 PM »

Illinois has 3 interstate-interstate concurrencies in roughly the same mileposts

I-55/72: between MM 92-98 on I-55
I-57/70: between MM 92-98 on I-70, though exit numbers use I-57's mileposts (157-163)
I-57/64: between MM 92-96 on I-57

And although much longer than the other three, part of the I-90/94 concurrency also falls in the MM 92-98 range for I-90.
« Last Edit: April 08, 2022, 06:23:02 PM by SkyPesos »
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CNGL-Leudimin

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Re: Random facts about interstates and US routes
« Reply #301 on: April 09, 2022, 04:10:13 PM »

Now that US 491 has been mentioned, it has never connected to US 91, either directly or indirectly. It connects to US 191, but it only came into existence long after US 191 ceased to intersect US 91.
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Re: Random facts about interstates and US routes
« Reply #302 on: April 13, 2022, 01:34:02 PM »

US 166 is longer than current US 66.
US 199 is longer than current US 99.
US 400 is longer than current US 0.
:sombrero:

Are there any 3di that are longer than their respective 2di?
I-238  :-D
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SkyPesos

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Re: Random facts about interstates and US routes
« Reply #303 on: April 15, 2022, 07:24:25 PM »

List of all interstate concurrencies for each 2di with one or more, and the ones that they keep and lose exit number continuity in. If two interstates start at mile 0 at the same point in a state, and both of them continues the mileage after the concurrency instead of resetting to 0 (like I-20/59 AL or I-55/64 MO), it's neither a win nor loss for either interstate.

I-5: Keep 10
I-10: Lose 5, 35
I-15: Keep 80,84,90
I-20: Lose 59 (MS)
I-24: Keep 69. Lose 40, 65
I-26: Lose 240
I-29: Keep 435. lose 35 (mile resets to its own north of concurrency).
I-35: Keep 10, 410, 40, 44, 29. Lose 70 (2A starts at where I-70 enters, so this whole loop can be considered as I-70's exit numbers), 80, 94 (E)
I-39: Lose 90 (IL and WI)
I-40: Keep 55, 65, 24, 75. Lose 35, 85
I-41: Lose 94, 894
I-43: Lose 894, 94
I-44: Keep 49, 55. Lose 35
I-49: Lose 44
I-55: Keep 70, 72, 74. Lose 20, 40, 44, 64 (MO)
I-57: Keep 64, 70
I-59: Keep 20 (MS)
I-64: Keep 55 (MO). Lose 57, 75, 77, 81, 95
I-65: Keep 24, 70. Lose 40
I-69: Lose 37, 55, 24, 465 (future), 96, 94
I-70: Keep 35, 71, 79. Lose 55, 57, 65, 76. Special case: uses I-270's mileage in most of IL.
I-71: Lose 75, 70
I-72: Lose 55
I-73: Keep 74
I-74: Keep 280, Lose 55, 465, 275, 73
I-75: Keep 85, 64, 71. Lose 40
I-76: Keep 77, 70
I-77: Keep 64. Lose 76, 81
I-79: Lose 70
I-80: Keep 580, 35, 94 (IL), 95. Lose 15, 94 (IN), 90 (IN)
I-81: Keep 77, 64, 86
I-83: Lose 695
I-84: Keep 380. Lose 15
I-85: Keep 40. Lose 75
I-86: Lose 81
I-87: Keep 287
I-90: Keep 94 (WI), 39 (WI and IL), 80 (IN). Lose 15, 94 (IL)
I-94: Keep 35E, 43, 41, 90 (IL), 80 (IN), 69. Lose 90 (WI), 80 (IN)
I-95: Keep 64, 495 (VA). Lose 80
I-96: Keep 69
« Last Edit: April 15, 2022, 08:22:06 PM by SkyPesos »
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vdeane

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Re: Random facts about interstates and US routes
« Reply #304 on: April 15, 2022, 08:17:03 PM »

I-95 doesn't have a concurrency with I-80.  I-80 ends at I-95 and the exit numbers there are based on the mileage from I-95's originally planned route in NJ (note that this section was also originally under NJDOT jurisdiction before being transferred to NJTA).  The numbers even continue south of I-80.
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SkyPesos

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Re: Random facts about interstates and US routes
« Reply #305 on: April 15, 2022, 08:21:36 PM »

I-95 doesn't have a concurrency with I-80.  I-80 ends at I-95 and the exit numbers there are based on the mileage from I-95's originally planned route in NJ (note that this section was also originally under NJDOT jurisdiction before being transferred to NJTA).  The numbers even continue south of I-80.
I thought I-95 was using a continuation of I-80's mileage between the NJ Turnpike and the GWB east of the latter's terminus. Forgot to mention that in the other post, but I thought it was interesting that one interstate is continuing another interstate's mileage and exit numbers past a terminus, like how I-70 continues I-270's mileposts in IL.

kurumi

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Re: Random facts about interstates and US routes
« Reply #306 on: April 15, 2022, 10:01:47 PM »

The "roundest" 3-digit interstate, in terms of prime factors, is Interstate 384. It's 2^7 * 3. All other existing 3di's have prime factors larger than 3.
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SkyPesos

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Re: Random facts about interstates and US routes
« Reply #307 on: April 15, 2022, 10:05:07 PM »

The "roundest" 3-digit interstate, in terms of prime factors, is Interstate 384. It's 2^7 * 3. All other existing 3di's have prime factors larger than 3.
We need I-128, I-256 or I-512 for only prime factors of 2 now. 128 is easy, allow MassDOT to pull an I-238 with MA 128?

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Re: Random facts about interstates and US routes
« Reply #308 on: April 16, 2022, 01:47:39 AM »

List of all interstate concurrencies for each 2di with one or more, and the ones that they keep and lose exit number continuity in. If two interstates start at mile 0 at the same point in a state, and both of them continues the mileage after the concurrency instead of resetting to 0 (like I-20/59 AL or I-55/64 MO), it's neither a win nor loss for either interstate.
Great list!

I thought of constructing a ranking of all interstates from this, but then I realized that can't be consistently done.  40 outranks 55, which outranks 70, which outranks 35, which outranks 40 again.
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SEWIGuy

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Re: Random facts about interstates and US routes
« Reply #309 on: April 16, 2022, 10:37:30 AM »

List of all interstate concurrencies for each 2di with one or more, and the ones that they keep and lose exit number continuity in. If two interstates start at mile 0 at the same point in a state, and both of them continues the mileage after the concurrency instead of resetting to 0 (like I-20/59 AL or I-55/64 MO), it's neither a win nor loss for either interstate.

I-5: Keep 10
I-10: Lose 5, 35
I-15: Keep 80,84,90
I-20: Lose 59 (MS)
I-24: Keep 69. Lose 40, 65
I-26: Lose 240
I-29: Keep 435. lose 35 (mile resets to its own north of concurrency).
I-35: Keep 10, 410, 40, 44, 29. Lose 70 (2A starts at where I-70 enters, so this whole loop can be considered as I-70's exit numbers), 80, 94 (E)
I-39: Lose 90 (IL and WI)
I-40: Keep 55, 65, 24, 75. Lose 35, 85
I-41: Lose 94, 894
I-43: Lose 894, 94
I-44: Keep 49, 55. Lose 35
I-49: Lose 44
I-55: Keep 70, 72, 74. Lose 20, 40, 44, 64 (MO)
I-57: Keep 64, 70
I-59: Keep 20 (MS)
I-64: Keep 55 (MO). Lose 57, 75, 77, 81, 95
I-65: Keep 24, 70. Lose 40
I-69: Lose 37, 55, 24, 465 (future), 96, 94
I-70: Keep 35, 71, 79. Lose 55, 57, 65, 76. Special case: uses I-270's mileage in most of IL.
I-71: Lose 75, 70
I-72: Lose 55
I-73: Keep 74
I-74: Keep 280, Lose 55, 465, 275, 73
I-75: Keep 85, 64, 71. Lose 40
I-76: Keep 77, 70
I-77: Keep 64. Lose 76, 81
I-79: Lose 70
I-80: Keep 580, 35, 94 (IL), 95. Lose 15, 94 (IN), 90 (IN)
I-81: Keep 77, 64, 86
I-83: Lose 695
I-84: Keep 380. Lose 15
I-85: Keep 40. Lose 75
I-86: Lose 81
I-87: Keep 287
I-90: Keep 94 (WI), 39 (WI and IL), 80 (IN). Lose 15, 94 (IL)
I-94: Keep 35E, 43, 41, 90 (IL), 80 (IN), 69. Lose 90 (WI), 80 (IN)
I-95: Keep 64, 495 (VA). Lose 80
I-96: Keep 69


I-39 doesn't use its mileage at all for exit numbers.  For the section north of I-90/94, I believe it still uses US-51's mileage, which is about five miles more than I-39's.  This includes the portion of I-39 that never was part of US-51 around Portage.
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SkyPesos

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Re: Random facts about interstates and US routes
« Reply #310 on: February 25, 2023, 08:12:23 PM »

Longest N-S interstate that each E-W interstate doesn't meet:

Ones that are I-95:
I-2, 8, 12, 14, 22, 24, 30, 44, 66, 68, 70, 72, 82, 84, 86, 88, 94, 96

Ones that are another N-S interstate:
I-4: I-35
I-10: I-81
I-16: I-35
I-20: I-15
I-26: I-75
I-40: I-5
I-42 (Future): I-75
I-64: I-35
I-74: I-35
I-76: I-75
I-78: I-75
I-80: I-85
I-90: I-85

ethanhopkin14

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Re: Random facts about interstates and US routes
« Reply #311 on: February 27, 2023, 11:16:34 AM »

List of all interstate concurrencies for each 2di with one or more, and the ones that they keep and lose exit number continuity in. If two interstates start at mile 0 at the same point in a state, and both of them continues the mileage after the concurrency instead of resetting to 0 (like I-20/59 AL or I-55/64 MO), it's neither a win nor loss for either interstate.
Great list!

I thought of constructing a ranking of all interstates from this, but then I realized that can't be consistently done.  40 outranks 55, which outranks 70, which outranks 35, which outranks 40 again.

You could rank them like the in the BCS days.  You take the number of concurrencies and you "rank" their strength of schedule and wins.  I-X0 and I-X5 are your best teams in the power conferences, the rest of the 2dis would be your middle of the road power conference teams (like Perdue or Illinois is to the Big 10) and 3dis would be your small conference teams.  Of course there is some wiggle room.  For example, I-94 is more like Wisconsin; every once in a while, they compete to win the Big 10 or actually might make it into the college football playoff. Another example would be I-476; it's a mid-major team but due to its length, it actually has an argument for playing in the college football playoff, like Cincinatti was a few years ago.
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Bickendan

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Re: Random facts about interstates and US routes
« Reply #312 on: February 27, 2023, 05:00:16 PM »

The "roundest" 3-digit interstate, in terms of prime factors, is Interstate 384. It's 2^7 * 3. All other existing 3di's have prime factors larger than 3.
Better to write it as 27-3, or it can read as 221...
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paulthemapguy

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Re: Random facts about interstates and US routes
« Reply #313 on: March 29, 2023, 11:54:37 AM »

The "roundest" 3-digit interstate, in terms of prime factors, is Interstate 384. It's 2^7 * 3. All other existing 3di's have prime factors larger than 3.

Cool, so I'm not the only one who thinks about numbers this way!
It's the Interstate highway with the MOST composite number!
I wonder what the US Highway is with the most composite number? 360 or something?
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Re: Random facts about interstates and US routes
« Reply #314 on: April 01, 2023, 12:34:44 AM »

The "roundest" 3-digit interstate, in terms of prime factors, is Interstate 384. It's 2^7 * 3. All other existing 3di's have prime factors larger than 3.

Cool, so I'm not the only one who thinks about numbers this way!
It's the Interstate highway with the MOST composite number!
I wonder what the US Highway is with the most composite number? 360 or something?

I-640 also has eight factors, 2*2*2*2*2*2*2*5.

How about this? The roads with the most different prime factors are I-210 (2*3*5*7), I-390 (2*3*5*13), I-510 (2*3*5*17), I-630 (2*3^2*5*7), I-690 (2*3*5*23), I-780 (2^2*3*5*13), I-840 (2^3*3*5*7), I-910 (2*5*7*13), and I-990 (2*3^3*5*11). There are none with five, because the smallest possible one (2*3*5*7*11) doesn't fit into three digits.
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SkyPesos

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Re: Random facts about interstates and US routes
« Reply #315 on: April 01, 2023, 12:25:35 PM »

How about this? The roads with the most different prime factors are I-210 (2*3*5*7), I-390 (2*3*5*13), I-510 (2*3*5*17), I-630 (2*3^2*5*7), I-690 (2*3*5*23), I-780 (2^2*3*5*13), I-840 (2^3*3*5*7), I-910 (2*5*7*13), and I-990 (2*3^3*5*11). There are none with five, because the smallest possible one (2*3*5*7*11) doesn't fit into three digits.
Also, two of them with 4 different prime factors that currently don't exist: I-570 (2*3*5*19) and I-870 (2*3*5*29) are under the same parent interstate, and both have been proposed as a number for a freeway in the past.

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Re: Random facts about interstates and US routes
« Reply #316 on: April 01, 2023, 12:49:01 PM »

Going oppositely, what is the highest prime Interstate?
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SkyPesos

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Re: Random facts about interstates and US routes
« Reply #317 on: April 01, 2023, 12:52:08 PM »

Going oppositely, what is the highest prime Interstate?
I-787

CNGL-Leudimin

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Re: Random facts about interstates and US routes
« Reply #318 on: April 01, 2023, 02:31:45 PM »

With the exception of I-2 (being the only even prime it's also the only prime 2di to go East-West) any prime interstates must either go North-South (2di) or branch off a North-South 2di (3di)

For US Routes is simpler: any prime US Routes, with the exception of both instances of US 2, must run North-South.
« Last Edit: April 01, 2023, 02:36:10 PM by CNGL-Leudimin »
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Re: Random facts about interstates and US routes
« Reply #319 on: April 01, 2023, 03:44:20 PM »

With the exception of I-2 (being the only even prime it's also the only prime 2di to go East-West) any prime interstates must either go North-South (2di) or branch off a North-South 2di (3di)

For US Routes is simpler: any prime US Routes, with the exception of both instances of US 2, must run North-South.

US 211 says hello.

A few other former routes did this too:
original US 163
original US 401
US 421's initial routing 1930-32
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SkyPesos

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Re: Random facts about interstates and US routes
« Reply #320 on: September 13, 2023, 08:46:47 AM »

Interstates that don't use their own mile markers/exit numbers through the majority of their route through a state:

I-70 IL: Shares mile markers with I-55 for its first 20 miles, then continues I-270's mile markers and exit numbers east of the I-55 split, resulting in mile markers about 4-5 miles lower than what it should be

I-80 IN: Shares mile markers with I-94 for its first 16 miles, then uses I-90/ITR's mile markers east of the I-94 split. Note how I-80 in Indiana doesn't even have its own Wiki article due to being entirely concurrent with other interstates in the state.

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Re: Random facts about interstates and US routes
« Reply #321 on: September 13, 2023, 10:52:43 PM »

Interstates that don't use their own mile markers/exit numbers through the majority of their route through a state:

I-80 IN: Shares mile markers with I-94 for its first 16 miles, then uses I-90/ITR's mile markers east of the I-94 split. Note how I-80 in Indiana doesn't even have its own Wiki article due to being entirely concurrent with other interstates in the state.

To be fair it's overlapped with I-90 the whole way east of the split, so one of the two routes was always going to be using the others' mileage.

Other examples include I-41 in Wisconsin, which uses the mileage for US 45 from I-94 northward, and then continues it up to Green Bay and beyond. When the freeway was built in Milwaukee, it was solely US 45, but when the freeway was extended it made the most sense to continue the mileage all the way north.

I-39 in Wisconsin has a similar situation, it uses US 51's mileage north of Portage because that was there first.
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Re: Random facts about interstates and US routes
« Reply #322 on: November 12, 2023, 09:20:43 PM »

Interstates with 200+ miles pass their final interchange with an x0 or x5 (Let me know if I missed any):

InterstateDirectionLast x0 or x5 JunctionDistance past that junction (miles)
70E75469
75S10467
75N80/90412
29N90386
95N90370
95S10352
15N90266
49N40263
35/35EN90246
91N90221

If I-69 in TX gets finished, it would be about 350 miles south of I-10 to the Mexico border via the 69E branch.
« Last Edit: November 12, 2023, 09:27:04 PM by SkyPesos »
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Re: Random facts about interstates and US routes
« Reply #323 on: November 13, 2023, 07:13:58 AM »

Interstates with 200+ miles pass their final interchange with an x0 or x5 (Let me know if I missed any):

InterstateDirectionLast x0 or x5 JunctionDistance past that junction (miles)
70E75469
75S10467
75N80/90412
29N90386
95N90370
95S10352
15N90266
49N40263
35/35EN90246
91N90221

If I-69 in TX gets finished, it would be about 350 miles south of I-10 to the Mexico border via the 69E branch.

I-22, 202 miles from I-65 to I-269
eastern I-84 is 230 miles from I-90 to I-81
eastern I-86 will also meet this criteria
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