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Re: How come there is two spurs Interstate 185 & 385 into Greenville, SC?

Started by jasonh300, September 15, 2018, 11:18:43 PM

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jasonh300

I started a new topic, so as not to bring back a zombie thread, but both of these spurs in Greenville, SC (I-185 and I-385) go in both directions from I-85, and are bannered N-S rather than E-W.  Is that a thing anywhere else?  I can't recall seeing a spur that went anywhere but one direction from the parent Interstate, and although I understand that I-85 runs nearly E-W through Greenville, is this a unique instance where the 3di spurs have the same cardinal directions as the parent interstate? 

If the northwestern gap of US-29 between I-185 and I-385 ever were to be closed, and it made a complete loop around Greenville...we'll call it I-285 for argument's sake, what would happen to the newly formed spur of I-285 that extends southeast from the loop?  Would it remain I-385, even though it wouldn't connect to I-85?  Or would it be a true spur of I-285 and become I-3285 or I-1285, etc (knowing that 4di is not a thing in the Interstate system...at least not as of yet).

(Original topic by ACSCmapcollector I found in the search: https://www.aaroads.com/forum/index.php?topic=18281.0 )


MNHighwayMan

Quote from: jasonh300 on September 15, 2018, 11:18:43 PM
I started a new topic, so as not to bring back a zombie thread, but both of these spurs in Greenville, SC (I-185 and I-385) go in both directions from I-85, and are bannered N-S rather than E-W.  Is that a thing anywhere else?  I can't recall seeing a spur that went anywhere but one direction from the parent Interstate, and although I understand that I-85 runs nearly E-W through Greenville, is this a unique instance where the 3di spurs have the same cardinal directions as the parent interstate? 

Both 3di spurs in Minnesota, I-394 and I-535, have the same cardinal directions as their parents.

TXtoNJ

I-526 in Charleston does the same thing. SC doesn't really care about spurs only going in one direction, apparently.

adventurernumber1

Also, before Interstate 26 was extended northwest further in North Carolina and into Tennessee, Interstate 181 was a spur that went on both sides of Interstate 81 in northeastern Tennessee. The stretch of interstate from Kingsport to Johnson City, that is now I-26, is what used to be I-181. This case wasn't in South Carolina, but it was in the nearby Tennessee.
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The Ghostbuster

Interstate 185 and Interstate 385 were both originally spurs into Greenville before both were subsequently extended. The portion between Interstate 26 and Exit 30 was part of US 276 until 1985. The Interstate 185 Southern Connector toll road opened in 2001.

ilpt4u

I-155 and I-355 in IL both are signed North/South, as I-55 is as well.

I-355 also (now) extends both North and South of Parent I-55 (after the Southern Extension to I-80 opened)

I-55 runs very Northeast/Southwest thru Chicagoland, and even across most of the state (as it upgraded/replaced US 66, which was signed East/West), but maintains North/South signed directions. Having North/South signed Spurs is not that bad here, since I-155 and I-355 are much more "true"  North/South Spurs of the more Diagonal Parent

I-555 in AR is signed North/South as well

TheStranger

California examples of spur routes having the same cardinal directions as the parent route:

I-80 (excluding 380 and 980 which do not connect to parent route) - former I-480, I-580, I-780
I-5 - I-505

In Nevada, I-515 is north-south like I-15 is

Chris Sampang

roadman65

Quote from: TXtoNJ on September 16, 2018, 12:29:44 AM
I-526 in Charleston does the same thing. SC doesn't really care about spurs only going in one direction, apparently.
SC don't care that one of their 3 digit odd spurs has now turned into a complete loop either with I-520.  However Georgia started it with an actual spur, but SCDOT continued that into their state and returned it to their parent.

However PA done something worse with the extension of I-376 though. 
Every day is a winding road, you just got to get used to it.

Sheryl Crowe

ilpt4u

Quote from: roadman65 on September 19, 2018, 10:44:29 PM
However PA done something worse with the extension of I-376 though.
I-376 and I-476 should have their designations reversed in PA...I-476 much more resembles a Spur, and I-376 much more resembles a Loop

But the Route Numbers are established at this point, I doubt they will change

ATLRedSoxFan

And let's not forget I-520 in Augusta. South Carolina doesn't seem on board with even numbered 3di's, where in a couple instances, it might have been appropriate.

ilpt4u

In Kansas, I believe I-135 and I-335 are both signed North/South, as Parent I-35 is

I did not think there was a rule/guideline regarding Spurs/Odd 3DIs having to be "Perpendicular"  to their Parents...so having the same signed Cardinal Direction does not seem that odd to me

I was under the impression that the bigger rule/guideline (that apparently can be bent, anyway) is that an (odd)DI should only touch its Parent once, whereas an (even)DI should touch its Parent multiple (>=2) times. But we can all cite examples of (odd)DIs that touch the Parent more than once, and (even)DIs that only touch the Parent once (or even not at all; Orphans excluded). So, Guidelines, not Rules

Eth

Quote from: ATLRedSoxFan on September 19, 2018, 11:30:31 PM
And let's not forget I-520 in Augusta. South Carolina doesn't seem on board with even numbered 3di's, where in a couple instances, it might have been appropriate.

Or, more likely, either they or Georgia felt it to be more trouble than it was worth to renumber existing I-520 when South Carolina decided to extend it.

Beltway

What about Interstate spur routes that connect 2 or more Interstates but then end in a open ended spur?

A few examples --
CA I-110, CA I-710, FL I-595, NJ I-195
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roadman65

I-391 in MA is a spur signed N-S just as its parent route is.
I-395 in CT/MA is another and this one is a spur as I-95 here runs E-W through CT and it stems due north of its parent from Waterford, CT.  In this case I-95 is still signed N-S and its spur shooting off perpendicular is also N-S.
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Mapmikey

Note that the original plan was for 185 and 385 within the city to be a continuous route, per the Yellow Book


http://www.ajfroggie.com/roads/yellowbook/greenville.jpg

Beltway

Quote from: Mapmikey on October 17, 2018, 09:25:45 AM
Note that the original plan was for 185 and 385 within the city to be a continuous route, per the Yellow Book
http://www.ajfroggie.com/roads/yellowbook/greenville.jpg

From looking at aerial photos it would have entailed major right-of-way acquisitions thru about 2 miles of urban areas.
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