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DJStephens:

--- Quote from: JKRhodes on January 10, 2020, 11:48:07 PM ---
--- Quote from: DJStephens on December 26, 2019, 01:57:14 PM ---University Avenue / I-25 interchange (Exit 1) is slated to begin reconstruction January 2nd.   Two large traffic circles are included to connect the myriad ramps and frontage roads near the interchange and the state University.   Kind of bizarre, maybe it will work.   Last of the seven Interstate interchanges in the general area to undergo major rehabilitation and or reconstruction.  Most of these rehabs and replacements (since 2000) with the exception of Motel Blvd (i-10 Exit 139) have fallen well short of ideal.

--- End quote ---

I remember going to NMSU and routinely seeing traffic back up onto Southbound I-25 from the University exit; lots of accidents. They lengthened the deceleration lane as a stopgap measure, but it still gets bad when school is in session. I can imagine it's even worse today with more students commuting from Sonoma Ranch and other points north. The roundabouts and underpass will allow traffic coming off of I-25, as well as Triviz, more direct access to the Pan American Center. This should take a lot of pressure off of the intersection at Triviz and University, and in turn, reduce backups on Mainline I-25.

As for the intersections east of I-25, I'm not a big fan of having three intersections  (I-25 ramps, Don Roser, Telshor) in such close proximity, and this project won't do anything to address that. Then again I don't know if any improvements over there would be warranted at this time anyway.

--- End quote ---

   The University Ave job (I-25 Exit 1) is actually a cheap redo.  It is only 33.4 million.  They are not touching most of the frontage roads - only a small piece of Triviz Ave is being altered, and there is no change to anything on the E side of the interchange.  Including the irksome University EB to 25 NB loop ramp, which was "restored" five or six years ago, after having been eliminated from it's original configuration as part of a "Quarter cloverleaf".   They spent 3.2 million to do that, and shifted the 25 NB mainlines six feet towards the median centerline as part of it.   
   Really doubt the new bridge has adequate width for eight lanes - two general purpose in each direction and two left hand turn lanes in each direction.  There should have been a symmetrical Diamond installed here - pulling the NB off and on ramps from 25 closer to the 25 mainlines.   That would have increased the distance between two of the University signals - Don Roser and the 25 ramps.  One way frontages would have prevented the current signal clustering.  And it is not clear if they are adding additional horizontal clearance for a six lane I-25, which thought? was supposed to happen between Exit 0 (I-10) and Exit 6 (US-70).  They are sticking message boards willy-nilly everywhere in the last few years, and several are just outside the R guardrail, on the four lane sections of 25.  Seems not thought out for any sort of widening, at all.  Cannot understand why these message boards cannot be centered on median centerline, with a center post, and boards facing in both directions?!?   
   Well at least it isn't becoming a DDI.  If the area had had true one way frontages established by 1980 - this area wouldn't have become the mess it is today.   

roadfro:
^ At least as far as message boards in the median are concerned: sometimes it makes more sense to mount the DMS structure from a cantelivered structure on the outer shoulder. Especially since you need to run power and communications lines to it (which are usually more likely to be in the outside shoulder) as well as have a controller cabinet. Both the controller cabinet and the sign itself must be accessible for maintenance purposes, so it's usually better and safer on the outside shoulder where a DOT vehicle can park well outside of the traveled way. The only time I've seen NevadaDOT mount two DMSs in the median on one structure, it was an extremely wide non-landscaped median (about 40+ feet wide).

Pink Jazz:

--- Quote from: roadfro on February 10, 2020, 03:51:20 PM ---^ At least as far as message boards in the median are concerned: sometimes it makes more sense to mount the DMS structure from a cantelivered structure on the outer shoulder. Especially since you need to run power and communications lines to it (which are usually more likely to be in the outside shoulder) as well as have a controller cabinet. Both the controller cabinet and the sign itself must be accessible for maintenance purposes, so it's usually better and safer on the outside shoulder where a DOT vehicle can park well outside of the traveled way. The only time I've seen NevadaDOT mount two DMSs in the median on one structure, it was an extremely wide non-landscaped median (about 40+ feet wide).

--- End quote ---


Speaking of DMS, NMDOT has bought exclusively from Adaptive Micro Systems since the early 2010s, making up the majority of the DMS in the state (previous installations were Skyline, and before that, ADDCO).  NMDOT since the early 2010s has chosen not to competively bid its contracts for DMS (unlike ADOT), since NMDOT prefers having commonality.  ADOT on the other hand prefers to go with the lowest cost (current vendor for ADOT is Daktronics).  I think because ADOT is a much larger agency than NMDOT, ADOT can better manage having multiple vendors and models of DMS.

JKRhodes:

--- Quote from: DJStephens on February 10, 2020, 12:10:21 AM ---
   Well at least it isn't becoming a DDI.  If the area had had true one way frontages established by 1980 - this area wouldn't have become the mess it is today.

--- End quote ---

You bring up an interesting point. So has the idea of a regional one-way frontage road system for I-25 been explored before? Aside from the area near the mall, it seems like it would be a pretty straightforward conversion and highly beneficial, especially for businesses near Spruce if they were to add on-ramps.

DJStephens:

--- Quote from: JKRhodes on April 28, 2020, 01:23:59 AM ---
--- Quote from: DJStephens on February 10, 2020, 12:10:21 AM ---
   Well at least it isn't becoming a DDI.  If the area had had true one way frontages established by 1980 - this area wouldn't have become the mess it is today.

--- End quote ---

You bring up an interesting point. So has the idea of a regional one-way frontage road system for I-25 been explored before? Aside from the area near the mall, it seems like it would be a pretty straightforward conversion and highly beneficial, especially for businesses near Spruce if they were to add on-ramps.

--- End quote ---

Was saying - there should have been one way frontages developed by 1980 - on both I-10 and 25 in the immediate municipal environs.   Just no foresight to have moved in that direction.   Only issue (then) is a small historic church (St James Presbyterian) that I-10 narrowly missed during its very late sixties construction.   So there would have been a gap in the EB frontage there.  Today, with development packing in at interchanges, on both 10 and 25, any true continuous frontages would be near impossible.   The early 10's "reconstruction" of the 10/25 interchange should have had conversion to one way frontages in it's immediate area.   Instead they must have got a waiver to cram in an additional projected diamond interchange just west of the 10/25 interchange - barely a half mile away.  Normal progression, as an area develops, and population and trips increase is to convert to one way frontage.  If one examines the current (newer) 10 E to 25 N ramp, the future traffic pattern is for (TO) EB 10 traffic to "enter" this ramp, and then "exit" it to reach 10 E.   Crazy, and one of the reasons why this state department is one of the worst in terms of design.   Has something like this been done anywhere else??

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