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Author Topic: I-275/I-696 Dilemma in Detroit  (Read 598 times)

Henry

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I-275/I-696 Dilemma in Detroit
« on: February 09, 2018, 10:21:18 AM »

I-275 and I-696 form a 1/2 loop around Detroit, with the former making up the west side, and the latter making up the north. I know that I-275 was supposed to continue north and terminate at I-75 outside Pontiac at one point, but that segment was cancelled, and all that's left is a stub freeway on which MI 5 runs. Would it have made more sense to have a backup plan in case one of those freeway segments was cancelled? Specifically, to route one or the other designation completely around the area, I-96 concurrency notwithstanding?
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Re: I-275/I-696 Dilemma in Detroit
« Reply #1 on: February 09, 2018, 10:29:23 AM »

There's no dilemma. Nobody cares that two routes end at the same interchange.
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Flint1979

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Re: I-275/I-696 Dilemma in Detroit
« Reply #2 on: February 09, 2018, 12:03:30 PM »

I don't see any dilemma. If you want to go back to I-75 you use I-96 WB to US-23 NB. I-696 starts at that interchange and I-275 ends there and there isn't anything else going to be done to complete I-275 as the land north of there is way too developed to plant a freeway through there. It's almost as bad as when they wanted to extend I-475 south of Flint to connect with US-23.
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GaryV

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Re: I-275/I-696 Dilemma in Detroit
« Reply #3 on: February 09, 2018, 02:36:34 PM »

I-275 could be cut back to end at the intersection with I-96 (Jeffries) and M-14.

But I-275 was completed before the Jeffries Freeway.  The mentality in metro Detroit is still that there are 2 separate sections of I-96.  The overlap of I-96/I-275 is pretty much called only I-275.

When the northern extension of I-275 to link back with I-75 was never built, the number stuck for the entire current stretch.
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Flint1979

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Re: I-275/I-696 Dilemma in Detroit
« Reply #4 on: February 09, 2018, 03:12:23 PM »

I-275 could be cut back to end at the intersection with I-96 (Jeffries) and M-14.

But I-275 was completed before the Jeffries Freeway.  The mentality in metro Detroit is still that there are 2 separate sections of I-96.  The overlap of I-96/I-275 is pretty much called only I-275.

When the northern extension of I-275 to link back with I-75 was never built, the number stuck for the entire current stretch.
I-275 should really be switched to I-175 since it never reconnects with I-75 but since it's always been I-275 and it was originally suppose to reconnect with I-75 I guess I-275 is fine. Same really with I-696 it should be I-396 and the reason Detroit doesn't have a full beltway of course is because it's a border city and Canada is in the way of making a full loop.
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Max Rockatansky

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Re: I-275/I-696 Dilemma in Detroit
« Reply #5 on: February 09, 2018, 04:42:21 PM »

It wasn’t even really apparent to me until High School that the I-96/I-275 was odd.  Most locals in Michigan just refer to it as “275” as noted upthread.  Really I think we’re long past the need to fix the designation with it already being local route slang. 

The Ghostbuster

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Re: I-275/I-696 Dilemma in Detroit
« Reply #6 on: February 09, 2018, 06:03:16 PM »

This also doesn't strike me as a dilemma. I think the numbers are fine the way they are.
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paulthemapguy

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Re: I-275/I-696 Dilemma in Detroit
« Reply #7 on: February 12, 2018, 08:50:25 PM »

I-275 and I-696 numbers are perfectly fine.  And they should definitely start with even digits, as they form a beltway.  I wouldn't be opposed to merging their numbers from the get-go, but there's been too long of a precedent now.
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skluth

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Re: I-275/I-696 Dilemma in Detroit
« Reply #8 on: February 12, 2018, 11:16:23 PM »

I-275 and I-696 form a 1/2 loop around Detroit, with the former making up the west side, and the latter making up the north. I know that I-275 was supposed to continue north and terminate at I-75 outside Pontiac at one point, but that segment was cancelled, and all that's left is a stub freeway on which MI 5 runs. Would it have made more sense to have a backup plan in case one of those freeway segments was cancelled? Specifically, to route one or the other designation completely around the area, I-96 concurrency notwithstanding?

It's not uncommon

I-494 and I-694 on the east side of St Paul MN
I-255 and I-270 south of St Louis MO (I live 2 miles from this and nobody here has a problem with it)
I-64 and I-264 and I-664 in Chesapeake VA (I used to live in Tidewater and it wasn't an issue)

There may be others but I thought of these off the top of my head
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Re: I-275/I-696 Dilemma in Detroit
« Reply #9 on: February 13, 2018, 12:16:49 PM »

I-275 should really be switched to I-175 since it never reconnects with I-75 but since it's always been I-275 and it was originally suppose to reconnect with I-75 I guess I-275 is fine. Same really with I-696 it should be I-396 and the reason Detroit doesn't have a full beltway of course is because it's a border city and Canada is in the way of making a full loop.

It connects interstates; that's all it needs to have an even 3di.
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Flint1979

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Re: I-275/I-696 Dilemma in Detroit
« Reply #10 on: February 13, 2018, 12:27:20 PM »

I-275 should really be switched to I-175 since it never reconnects with I-75 but since it's always been I-275 and it was originally suppose to reconnect with I-75 I guess I-275 is fine. Same really with I-696 it should be I-396 and the reason Detroit doesn't have a full beltway of course is because it's a border city and Canada is in the way of making a full loop.

It connects interstates; that's all it needs to have an even 3di.
How does that matter? I-196 connects between I-96 and I-94 and has an odd 3-di.
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JCinSummerfield

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Re: I-275/I-696 Dilemma in Detroit
« Reply #11 on: February 13, 2018, 05:34:33 PM »

I don't know of anybody in Michigan who views this a problem.  I would have cut I-275 back to the M-14 interchange at one point, but nobody has any problems, so it's best left alone.
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GaryV

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Re: I-275/I-696 Dilemma in Detroit
« Reply #12 on: February 13, 2018, 06:46:06 PM »

I-275 should really be switched to I-175 since it never reconnects with I-75 but since it's always been I-275 and it was originally suppose to reconnect with I-75 I guess I-275 is fine. Same really with I-696 it should be I-396 and the reason Detroit doesn't have a full beltway of course is because it's a border city and Canada is in the way of making a full loop.

It connects interstates; that's all it needs to have an even 3di.
How does that matter? I-196 connects between I-96 and I-94 and has an odd 3-di.
Not originally.  I-96 and I-196 swapped designations west of Grand Rapids.  Primarily because what is now I-196 was built later, and it didn't make sense to change route numbers as you traveled from Lansing through GR to Muskegon (or vice versa).
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Re: I-275/I-696 Dilemma in Detroit
« Reply #13 on: February 14, 2018, 09:02:50 AM »

The 275-696 interchange looks problematic on a map, but from approaching it the 275-696 movements definitely feel like an exit. So in that case route continuity between the two would be counter intuitive.

The I-96 movement at the M-14/S JCT I-275 interchange is a greater Human Factors violation. Was there ever a plan to route I-96 roughly along M-5/Grand River Ave between where it curves to the west and where M-5 picks up? That would make a lot more sense conceptually than piggy backing 96 along 275.

Edit - after a little research I see the answer is yes.
« Last Edit: February 14, 2018, 09:07:41 AM by cbeach40 »
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Re: I-275/I-696 Dilemma in Detroit
« Reply #14 on: February 14, 2018, 09:24:37 AM »


It connects interstates; that's all it needs to have an even 3di.
How does that matter? I-196 connects between I-96 and I-94 and has an odd 3-di.

I'm saying they meet one of the numbering conventions for even 3di's. Either they loop back to the parent or they connect to another interstate.

Odd 3di's can connect to other interstates or 'dead end'.

It's more flexible to be able to use both evens and odds for those 'connector' 3di's.  A situation like 275/696 where they function like loop freeways or as part of a system of urban freeways, evens make sense.  For 196 where it's sort of an alternate mainline, an odd makes sense.  Same for 135 in Kansas (although, that one could probably be a mainline interstate, but I don't want to get too off subject)
Naturally not everyone follows this sensible rule of thumb.  I-355 would be perfectly acceptable as an even 3di.  I-476 on the Northeast Extension would've made more sense as an odd 3di, but there was an existing even 3di that was easy to extend.

Anyway, the point is, there is no rule that an even 3di must return to it's parent, it's just a guide.  And there are dozens and dozens of even 3di's that can testify to this simple fact.
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