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Author Topic: Nevada's I-580 exits to be renumbered in 2019  (Read 427 times)

roadfro

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Nevada's I-580 exits to be renumbered in 2019
« on: May 15, 2019, 10:43:09 AM »

NDOT is changing exit numbers along I-580 starting this summer to coincide with I-580 mileage (the current numbering is based on the underlying US 395 statewide mileage starting from the CA border at Topaz Lake).

NDOT: Exit numbers on I-580

The webpage doesn't say it, but I'd hope NDOT is also going to install the green enhanced mileposts along all of I-580 to correspond with the new exit numbers. There's a few along the newest southern section of the Carson City Freeway, but that's it.


I'm actually not a fan, only because it will create an exit number gap at the Reno Spaghetti Bowl as I-580 ends while US 395 continues north from there. It's not a huge deal in the long term, but I always liked that the whole freeway had consistent exit numbers. This has been a situation unique to both of Nevada's Interstate spurs because the I-515 & US 95 overlap in Las Vegas/Henderson is the same way—the exit numbering is consistent along US 95 through the Vegas Spaghetti Bowl despite the I-515 terminus there. In both cases, the US route came first and the Interstate signed much later.

The rationale given for the change is "Federal guidelines require interstate exit numbers to reflect mileage specific to that corridor." I'm guessing they're citing the standard in MUTCD 2E.31 paragraph 16: "Where numbered routes overlap, continuity of interchange numbering shall be established for only one of the routes (see Figure 2E-21). If one of the routes is an Interstate and the other route is not an Interstate, the Interstate route shall maintain continuity of interchange numbering."

That's been a standard for a while...so why didn't NDOT renumber the freeway when the final link between Reno and Carson City was opened circa 2012? Maybe someone was researching exit numbering policies for the I-11 changeover down south and realized that I-580 was out of compliance with this standard...?
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Roadfro - AARoads Pacific Southwest moderator since 2010, Nevada roadgeek since 1983.

The Ghostbuster

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Re: Nevada's I-580 exits to be renumbered in 2019
« Reply #1 on: May 15, 2019, 04:17:28 PM »

So the 2019 (and 2020) Rand McNally Road Atlases didn't goof when they showed the roadway's exits being numbered via Interstate 580's mileage instead of US 395's mileage. They just jumped the gun a little.
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vdeane

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Re: Nevada's I-580 exits to be renumbered in 2019
« Reply #2 on: May 15, 2019, 08:14:30 PM »

I'd argue that it's not really out of compliance as-is.  I-580 is wholly concurrent with US 395 (unless they're planning on changing that?), and nothing says that the numbers have to start at 0 (see: I-276).
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Please note: All comments here represent my own personal opinion and do not reflect the official position of NYSDOT or its affiliates.

mrsman

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Re: Nevada's I-580 exits to be renumbered in 2019
« Reply #3 on: May 15, 2019, 10:16:06 PM »

It seems like it would be more confusing to change the exit numbers now.  And its particularly bad where a freeway has room to grow in the south or west direction.  If the freeway were extended further down the corridor, would the numbers need to be changed again?

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ClassicHasClass

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Re: Nevada's I-580 exits to be renumbered in 2019
« Reply #4 on: May 15, 2019, 11:01:22 PM »

Quote
I'm actually not a fan, only because it will create an exit number gap at the Reno Spaghetti Bowl as I-580 ends while US 395 continues north from there.

I'm not a fan either; I think folks would find it terribly confusing. Will numbers suddenly jump as you cross I-80?
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roadfro

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Re: Nevada's I-580 exits to be renumbered in 2019
« Reply #5 on: May 16, 2019, 01:37:47 AM »

It seems like it would be more confusing to change the exit numbers now.  And its particularly bad where a freeway has room to grow in the south or west direction.  If the freeway were extended further down the corridor, would the numbers need to be changed again?

NDOT has no plans to extend I-580 West along US 50. And now that the US 395 corridor is not in contention for the future  routing of I-11, extending the freeway south from Carson City is much less likely. But if they did, NDOT would need to renumber again.



Quote
I'm actually not a fan, only because it will create an exit number gap at the Reno Spaghetti Bowl as I-580 ends while US 395 continues north from there.

I'm not a fan either; I think folks would find it terribly confusing. Will numbers suddenly jump as you cross I-80?

Yes. Exit 36 (I-80, current exit 68) and exit 69 (Oddie Blvd) will be less than a mile apart.
« Last Edit: May 16, 2019, 01:46:40 AM by roadfro »
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Roadfro - AARoads Pacific Southwest moderator since 2010, Nevada roadgeek since 1983.

gonealookin

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Re: Nevada's I-580 exits to be renumbered in 2019
« Reply #6 on: May 16, 2019, 10:02:28 PM »

Quote
I'm actually not a fan, only because it will create an exit number gap at the Reno Spaghetti Bowl as I-580 ends while US 395 continues north from there.

I'm not a fan either; I think folks would find it terribly confusing. Will numbers suddenly jump as you cross I-80?

Yes. Exit 36 (I-80, current exit 68) and exit 69 (Oddie Blvd) will be less than a mile apart.

Yeah, this stuff bothers me.  Exit numbering should serve the 99.8% of the population that has no idea what "MUTCD" stands for.  If NDOT is going to renumber from South Carson to Reno, they ought to continue the renumbering on US 395 all the way up to Bordertown at the NV/CA state line.
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roadfro

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Re: Nevada's I-580 exits to be renumbered in 2019
« Reply #7 on: May 16, 2019, 10:35:11 PM »

If NDOT is going to renumber from South Carson to Reno, they ought to continue the renumbering on US 395 all the way up to Bordertown at the NV/CA state line.

But if they were to do that, then exit numbers would not match US 395 mileposting in any way (statewide or county-wide). I almost prefer there be a number gap.
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Roadfro - AARoads Pacific Southwest moderator since 2010, Nevada roadgeek since 1983.

gonealookin

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Re: Nevada's I-580 exits to be renumbered in 2019
« Reply #8 on: May 16, 2019, 11:13:00 PM »

If NDOT is going to renumber from South Carson to Reno, they ought to continue the renumbering on US 395 all the way up to Bordertown at the NV/CA state line.

But if they were to do that, then exit numbers would not match US 395 mileposting in any way (statewide or county-wide). I almost prefer there be a number gap.

I get the technical point, of course, or I would never have found this forum in the first place.  Just think the sequential numbering on the green signs should be more friendly to the general public.  NDOT could still maintain the white paddles and the Highway Patrol might say on their radio "The crash is northbound 395 near Washoe 77" even if that's between green-sign Exit 48 and Exit 52 or whatever.
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mrsman

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Re: Nevada's I-580 exits to be renumbered in 2019
« Reply #9 on: May 17, 2019, 12:23:58 AM »

I think there should be an exception to the rule about signing mileposts (and by extension exit numbers) that's whenever an interstate highway totally within the realm of a single US highway route, the US highway route exit numbers will have precedence.  This means that the exit numbers will follow 395, even though part of the road is also an interstate.

Nexus 5X

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Re: Nevada's I-580 exits to be renumbered in 2019
« Reply #10 on: May 17, 2019, 07:46:58 AM »

I think there should be an exception to the rule about signing mileposts (and by extension exit numbers) that's whenever an interstate highway totally within the realm of a single US highway route, the US highway route exit numbers will have precedence.  This means that the exit numbers will follow 395, even though part of the road is also an interstate.

Nexus 5X

That would cause problems for roads like I-393. The current sequential numbers and mile-based numbers beginning at 0 are 1 are fine, but there's no point in using milage for US 4 or US 202.
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GaryA

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Re: Nevada's I-580 exits to be renumbered in 2019
« Reply #11 on: May 17, 2019, 11:10:00 AM »

Perhaps a miniature shield might be of use -- something to say "This is I-580 exit X" or "This is US-395 exit Y".  This could also be done anywhere there's a multiplex and it might not be obvious which highway's exit numbers (or mileage) is being referenced.
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ClassicHasClass

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Re: Nevada's I-580 exits to be renumbered in 2019
« Reply #12 on: May 17, 2019, 02:21:48 PM »

Although I appreciate the sentiment, I think two exit numbers would end up being more confusing than one even if the one were discontinuous.
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