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FrCorySticha:

--- Quote from: roadman65 on September 06, 2021, 12:43:06 PM ---What is the reasoning behind the crazy A-C on I-80 at I-25 and worse yet D-A on I-25 at I-80 in Cheyenne?  The exit number suffixes donít make any sense at all.

--- End quote ---
They do make sense, just not in the way we think of suffixed exits:

359A: Both directions from I-80 to I-25 south
8B: Both directions from I-25 to I-80 west
359C: Both directions from I-80 to I-25 north
8D: Both directions from I-25 to I-80 east

There is a method to Wyoming's madness. Whether or not it's a good idea is another story.

andy3175:

--- Quote from: FrCorySticha on September 06, 2021, 01:37:00 PM ---
--- Quote from: roadman65 on September 06, 2021, 12:43:06 PM ---What is the reasoning behind the crazy A-C on I-80 at I-25 and worse yet D-A on I-25 at I-80 in Cheyenne?  The exit number suffixes donít make any sense at all.

--- End quote ---
They do make sense, just not in the way we think of suffixed exits:

359A: Both directions from I-80 to I-25 south
8B: Both directions from I-25 to I-80 west
359C: Both directions from I-80 to I-25 north
8D: Both directions from I-25 to I-80 east

There is a method to Wyoming's madness. Whether or not it's a good idea is another story.

--- End quote ---

The interchange between Interstate 25 and Missile Drive/Happy Jack Road (WYO 210) used to be a cloverleaf, but three of the four loop ramps were removed as well as the first offramp from southbound. As a result of the ramp removals, the offramps from both directions of Interstate 25 are signed as Exit 10D, even though there is no Exit 10A, 10B, or 10C. The implied B ramp existed until the cloverleaf was eliminated, and the A and C ramps were on Missile Drive... even though several of these movements were eliminated when the interchange converted from cloverleaf to a folded diamond on the west side of the interchange and a diamond interchange on the east side.

Here is a link to the Google Maps aerial that shows the previous ramp at Exit 10D configuration fairly well in satellite view:
https://goo.gl/maps/3BPcCvZzJzgXGJd47

Our page goes into detail on this, as we have photos showing the previous and current configurations:
https://www.aaroads.com/west/i-025se_wy.html
https://www.aaroads.com/west/i-025na_wy.html

As for why WyDOT chose the exit numbering scheme, FrCorySticha has the best explanation ... but it is not consistent with any other state's application of numbering I've seen. Maybe there are other examples of something similar elsewhere? I could not find any other cloverleafs in Wyoming other than the current I-25/80 interchange.

Mapmikey:
An example of Wyoming conforming to the standard (sorta) is the I-90 interchange with I-90 Bus and I-25 in Buffalo - https://goo.gl/maps/MKkgAapfKnA2vwVDA

I-90 EB has Exit 56A with I-90 Bus and Exit 56B with I-25.   I-90 WB has no exit with I-90 Bus but I-25 is still Exit 56B.

US 89:
There is also a more usual suffix application on I-25 in Casper, with 188A going to Center St and 188B to US 20/26.

As far as I can tell, those five cases (359 on 80, 8/10/188 on 25, and 56 on 90) are the only letter suffixes in the entire state of Wyoming.

andy3175:
Bridge demolition along Interstate 25 in Casper continues...the link has photos of the partially demolished bridge.

https://oilcity.news/galleries/2021/08/17/photos-interstate-25-southbound-bridge-in-casper-demolished-for-replacement-project/


--- Quote ---The Interstate 25 bridge over North Walsh Drive in east Casper is partially demolished in a project to replace the structures.

On Tuesday, large sections of the southbound section of the bridge dramatically laid on their sides in the process to remove and replace them.

According to WYDOT, both sections of the bridge will be demolished and replaced with a single, shorter design.

The project, which has an estimated cost of $29.7 million, started in June and is scheduled to be completed by the end of June 2023.

Traffic has been diverted into detours to bypass the area, and delays are expected throughout the project, WYDOT said in a press release earlier this year.

ďAs the project progresses, the impact to traffic on I-25 and on East Yellowstone Highway, between Curtis Street and the F Street turnoff area, will require motorists to reduce their speed, pay attention, and if possible, find alternate routes,Ē WYDOT said in the release.
--- End quote ---

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