False point on ID US30?

 
Post new topic   This topic is locked: you cannot edit posts or make replies.    Clinched Highway Mapping Forum Index -> Old topics
View previous topic :: View next topic  
Author Message
oscar_voss



Joined: 27 Jul 2008
Posts: 622
Location: Arlington VA

PostPosted: Mon Dec 28, 2009 4:48 am    Post subject: False point on ID US30? Reply with quote

In the "Concurrency List" thread in "Other Discussion":

[quote="tikester"]I note that the concurrency function cannot sort out situations where highways share consecutive points, but not concurrent routings. As an example, on ID I-84, 137 and 141 are consecutive waypoints; they are also consecutive waypoints on ID US26 and ID US30 (in both cases, I-84(137) and I-84(141)), despite the fact that I-84 does not share the routing with the two US highways between these points (the US highways follow ID I-84BLBli).[/quote]

Actually, looking at the US30 routing, it appears that the I-84(141) point should be deleted for US30 (but not US26), as US30 peels away from ID I-84BLBli west of interchange 141, rather than re-intersecting I-84 there.
Back to top View user's profile Send private message Send e-mail Visit poster's website
oscar_voss



Joined: 27 Jul 2008
Posts: 622
Location: Arlington VA

PostPosted: Mon Dec 28, 2009 5:12 am    Post subject: Re: False point on ID US30? Reply with quote

[quote="oscar_voss"]
Actually, looking at the US30 routing, it appears that the I-84(141) point should be deleted for US30 (but not US26), as US30 peels away from ID I-84BLBli west of interchange 141, rather than re-intersecting I-84 there.[/quote]

A related point: Since US30 peels away from ID I-84BLBli and US 26 between I-84(137) and I-84(141), a point should be added to US 26 between those two exits for US30_E. That would make it unnecessary to add a shaping point for US26, per the "Concurrency List" thread in "Other Discussion," to eliminate the false concurrency of US26 with I-84 east of exit 137.
Back to top View user's profile Send private message Send e-mail Visit poster's website
yakra



Joined: 30 Jul 2008
Posts: 2600
Location: Area Code 207

PostPosted: Mon Dec 28, 2009 2:25 pm    Post subject: Re: False point on ID US30? Reply with quote

My observations are based on a quick scan of GMSV.
What I see is:
US26 on I-84
US30 on I-84BL

oscar_voss wrote:
Actually, looking at the US30 routing, it appears that the I-84(141) point should be deleted for US30 (but not US26), as US30 peels away from ID I-84BLBli west of interchange 141, rather than re-intersecting I-84 there.
Correct. Furthermore, a 1stAve point should be added further west, to properly align with the I-84BL. What we're looking at now *is* US30 `plexing with I-84, taking the exit, and jogging back west a bit before continuing.

oscar_voss wrote:
A related point: Since US30 peels away from ID I-84BLBli and US 26 between I-84(137) and I-84(141), a point should be added to US 26 between those two exits for US30_E. That would make it unnecessary to add a shaping point for US26, per the "Concurrency List" thread in "Other Discussion," to eliminate the false concurrency of US26 with I-84 east of exit 137.
If I'm right & US-26 does follow I-84, that makes this moot.
The concurrency detected between I-84 & US26 would be a true positive.
With US30 moved off I-84, there'd be no false positive, and a true positive for I-84BL.

Andy, what's your take on where the routes should go here?
As for shaping points, I'd still consider them per the 5-mile rule for visual clarity.
Back to top View user's profile Send private message
andytom



Joined: 14 Jul 2008
Posts: 412
Location: Beaverton, OR

PostPosted: Mon Dec 28, 2009 8:51 pm    Post subject: Reply with quote

I finally took a good look at this area, both in the route logs and on GMSV. The route logs are inconclusive as to which exit US-30 comes off. Concurrent routes are only shown on one of the route logs with the concurrency and a link shown on the other route. Interstates get precendent for the route listing then IBL's, US hwys then finally SR's. The end of the US-30 alone section doesn't show which way the hwy goes from there (I thought it did which is why I used the route that I did). GMSV obviously shows that US-26 gets off at exit 141 and US-30 gets off at exit 137.

I'll make this change and it will go in with the big changes coming when the ID state routes are put in to be activated (probably another week or two).

--Andy
Back to top View user's profile Send private message Visit poster's website
yakra



Joined: 30 Jul 2008
Posts: 2600
Location: Area Code 207

PostPosted: Tue Dec 29, 2009 1:11 am    Post subject: Reply with quote

Any idea what's with the inverse shields?
Or Google calling US30 Scenic?
Back to top View user's profile Send private message
Bickendan



Joined: 29 Jul 2008
Posts: 1018
Location: Portland, OR

PostPosted: Tue Dec 29, 2009 2:15 am    Post subject: Reply with quote

Scenic US 30 is the correct designation, IIRC. The shields are brown.
Back to top View user's profile Send private message Visit poster's website
froggie



Joined: 14 Jul 2008
Posts: 848
Location: Norfolk, VA (when not out to sea)

PostPosted: Tue Dec 29, 2009 8:01 am    Post subject: Reply with quote

Is Scenic US 30 a separate route from US 30? Reason I'm asking is because US 89 in the southeast corner of Idaho has brown shields, but is still "vanilla" US 89.
_________________
Froggie
http://www.ajfroggie.com
Back to top View user's profile Send private message Visit poster's website
yakra



Joined: 30 Jul 2008
Posts: 2600
Location: Area Code 207

PostPosted: Tue Dec 29, 2009 1:16 pm    Post subject: Reply with quote

Not according to us-highways.com. I also don't see another alternative for US30 on the map. Looks like the brown shields are just a peculiarity of Idaho's then?
Back to top View user's profile Send private message
andytom



Joined: 14 Jul 2008
Posts: 412
Location: Beaverton, OR

PostPosted: Tue Dec 29, 2009 5:22 pm    Post subject: Reply with quote

Any designated scenic route in ID has a brown shield rather than a black one. In the case of US-30 in this area, it is probably because the hwy goes through the Thousand Springs area, the outflow from the aquifer under south central ID.

--Andy
Back to top View user's profile Send private message Visit poster's website
tikester



Joined: 07 May 2009
Posts: 21
Location: San Leandro, CA

PostPosted: Wed Dec 30, 2009 6:59 pm    Post subject: Thanks! Reply with quote

Thanks for all of the info. I'm going up there in a couple weeks to drive I-84BLBli and US30 and US26 around there...so I'll see and update appropriately.
_________________
tikester
Back to top View user's profile Send private message
admin
Site Admin


Joined: 13 Jul 2008
Posts: 4053
Location: Maryland

PostPosted: Fri Feb 10, 2012 11:12 pm    Post subject: Reply with quote

Anything here that still needs action?
Back to top View user's profile Send private message
si404



Joined: 07 Oct 2009
Posts: 708

PostPosted: Wed Jul 09, 2014 6:36 am    Post subject: Reply with quote

clearly not
Back to top View user's profile Send private message
Display posts from previous:   
Post new topic   This topic is locked: you cannot edit posts or make replies.    Clinched Highway Mapping Forum Index -> Old topics All times are GMT - 4 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


2005 Powered by phpBB © 2001, 2005 phpBB Group

Free Web Hosting | File Hosting | Photo Gallery | Matrimonial


Powered by PhpBB.BizHat.com, setup your forum now!
For Support, visit Forums.BizHat.com