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[roadman65]

You can't always get what you want.   In urban and suburban areas its sometimes impossible to keep ramps in an orderly fashion to serve the number sequence.  By your logic in Florida where both FL 429 and FL 50 exchange with the Turnpike with Exit 267A & B respectively in both directions the A ramp comes first with B second would have the SB roadway relocated the exit for Highway 50 so it diverges first. 

The 267A is for FL 429 which diverges in both directions from the Turnpike before the ramp to SR 50 diverges.  In a way it works out number wise and it uses the same number both ways for each. It was done as that was the best place to add ramps to the interchange needed to transfer motorists between the two freeways.  Tell FTE to relocate the SB ramp to SR 50, you will be looked at as an oddball.  Renumber the A & B southbound and you cause confusion for those giving out directions.

[ran4sh]

The standard for exit number order has always been the location of the intersecting road itself, rather than the location of the ramps used to reach it.

[jeffandnicole]

I am still shocked when a mileage based exit thread comes up how many people respond to it.  All the time. Why is it so interesting?  IDK it just doesn't matter to me as much as other road related things.  But hey that's me.

However, I will go against myself and add this.....mileage based exits doesn't do a thing on short expressways.  Such as CT-2A in CT.  That short expressway has mileage based exits.  Why?  It doesn't help a thing?  I'd say just don't number the exit or leave it sequential.

Allowing different numbering systems causes confusion.

Sequential only exists as an exit numbering system because it was invented first. Distance/reference based is clearly a superior system and if a state changes to that system, there is no reason to leave some segments of the freeway network in the sequential numbering system.

In fact, one could argue that the proper solution is to close some of the closely-spaced ramps so that there is no issue where there are more ramps than there are mile numbers.

Ramps are placed where they are needed for traffic purposes.

Closing ramps because someone doesn't like the exit number?  You try telling that with a serious face and see how well the public accepts that answer...

It's not because of the exit number, but because it is too close to other ramps. The exit number is the evidence of the ramp being too close, in other words it is the symptom rather than the disease.

That's not what you just said, and there are various engineering options to deal with closely spaced exits.

[dgolub]

So the Hutch is being re-numbered?
This is the first I heard of it; what happens once it enters CT?

If we were talking about any other state, the answer would be that the exit numbering resets and starts over at 0 or 1.

However, because we're talking about Connecticut...the exit numbering resets and starts at 27, because to do otherwise would change the Merritt Parkway's historic essential character. 

I'm pretty sure that they do plan to change that, but not for another few years.

[roadman65]

The next signing replacement will rendered that. Connecticut says the mile based exit numbers will be done at next freeway guide replacement project. So when the Merit Parkway is scheduled for a full sign replacement, it will change.

That’s why only I-395 was just done. It was its place in time for overall replacing.

[jp the roadgeek]

And here's what the Merritt numbers will look like once converted (assuming round up convention for current projects):

27: 1
28: 3
29: 4
31: 6
33: 9A (at MP 8.89; could be fudged to 8 to avoid a suffix)
34: 9B (see above)
35: 10
36: 13
37: 14
38: 16
39 (A-B NB): 17 (A-B)
40 A/B: 18 A/B
41: 21
42: 22
44: 27
46: 28 (at MP 28.58; should be fudged down to avoid a suffix)
47: 29
48: 30
49 (N/S NB): 32 (A/B)
50 (SB ONLY): 33
51 (NB ONLY): 34A
52: 34C (NB); 34 C-B-A (SB; CT 8 is 34 C-B with each getting a directional suffix, exit to CT 108 numbered to match NB)
53: 37
Merritt/Wilbur Cross Changeover
54: 38A
55A: 38B
55B (NB ONLY): 39
56: 41
57-58: 43 A/B
59: 47
60: 50
61-62: 52 A/B
63: 53
64: 58
65: 59
66: 61
67 (W/S SB): 64 (B/A)
68: (N/E and W NB) 65 (A/B; NE goes single suffix)

Hartford portion
85: 79 (at MP 79.65, but fudged down to avoid major alphabet city at I-91)
86: 80A
87: 80B (and yes, 80A will come before 80B SB)
89 (NB ONLY): 81
90: 82 (A/B/C NB; each ramp should get a suffix; US 5 is 82A, CT 2 is 82 B/C
91 (NB ONLY): 83

[vdeane]

And here's what the Merritt numbers will look like once converted (assuming round up convention for current projects):

27: 1

Why have two numbers for one interchange?  Just use NY's number of 19.  It's right on the border and is for NY 120A.  It's practically a NY interchange that happens to cross into CT.  The only reason the numbers don't match now is because the numbering on the Hutch has changed (multiple times, once the conversion to mile-based numbers goes through) since they were initially set.

[abqtraveler]

The next signing replacement will rendered that. Connecticut says the mile based exit numbers will be done at next freeway guide replacement project. So when the Merit Parkway is scheduled for a full sign replacement, it will change.

That’s why only I-395 was just done. It was its place in time for overall replacing.

And they just replaced the signs on the Merritt a few years ago, so it'll probably be another 20 to 30 years before they replace those signs and renumber exits.

[roadman65]

Maybe CT just plans to do interstates only in the conversion.  Virginia did that as even some 3 digits like I-395 and I-664 still use sequence order numbers.

[jp the roadgeek]

Maybe CT just plans to do interstates only in the conversion.  Virginia did that as even some 3 digits like I-395 and I-664 still use sequence order numbers.

Not true.  CT 72 will be converted soon (a couple signs were erected with one of the new exit numbers but have since been overlain), as will CT 2, and a couple of small sections of CT 3 and CT 17.

[The Ghostbuster]

If CT 15 does get new numbers, couldn't they just patch the new numbers over the old ones? That way the signs don't have to be replaced.

[Alps]

Well I was just on the Hutch, and that may be the last time I see it sequential. I thought it had already changed over but at least not SB.

[Scott5114]

Maybe I'm unique, but I don't like milepost numbering on roads like the parkways. Since everything's close together, distances don't matter quite as much, and it's better to have distinct numbers than 4A, 4B, and 4C for three different interchanges.

if you can't tell the difference between 4A and 4C please don't drive

I can tell the difference between 4A and 4C but usually letters are (or should be) used within the same interchange, and it's entirely understandable for that to cause confusion. Never mind that someone coming south might assume 4A is before 4C, and panic if they see 4C first, thinking they'd missed their exit - especially with the bad signage on Westchester parkways. The number should be the interchange number, a letter - if needed - should designate the direction within that interchange. Surely this is no more nonsensical an argument than, say, that Interstates ought to be in their proper grid.

None of these made-up problems have ever happened in Oklahoma, and that's a state that sometimes causes unwarranted suffixes by refusing to use Exit 0s (the first two miles of exits are always Exit 1, meaning "mile 1" can rack up truly impressive suffix letters without particularly densely-placed interchanges).

[vdeane]

Maybe CT just plans to do interstates only in the conversion.  Virginia did that as even some 3 digits like I-395 and I-664 still use sequence order numbers.

Not true.  CT 72 will be converted soon (a couple signs were erected with one of the new exit numbers but have since been overlain), as will CT 2, and a couple of small sections of CT 3 and CT 17.

Plus CT 2A was converted along with I-395.

If CT 15 does get new numbers, couldn't they just patch the new numbers over the old ones? That way the signs don't have to be replaced.

In theory... in practice, CT seems to be replacing whole exit tabs instead.