Road Types (USA) – comprehensive overhaul of drivable roads

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Re: Road Types (USA) – comprehensive overhaul of drivable ro

Postby bgodette » Sat Apr 19, 2014 4:44 pm

daknife wrote:One word, Construction. As I mentioned in another comment changing the road to a preferred road type would dump traffic because of a major construction project nearby, the sectin in question runs between a mH and a Primary road, a good deal of traffic is being diverted over to the primary road, but on a road designed for increased capacity.
Again, what makes you think that will happen just because the type is changed? Type does not include any preference when there's historical data and this has been demonstrated ad-infinitum. All type does it determine when a potential route running over it will get pruned depending on total route length, run length of the section in question, and where in that route that section is. Pruning is not preference.

So unless this section of road exists in the middle of nowhere with no cell coverage or was just deleted and redrawn in the last week, type is meaningless in terms of reroutes due to construction.
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Re: Road Types (USA) – comprehensive overhaul of drivable ro

Postby bgodette » Mon May 12, 2014 3:54 pm

pumrum wrote:Is this an incorrect assumption? If so, can the Wiki be updated to clarify that it is acceptable for the segments used for entrance and exit ramps to be something other than "ramp" type?
Have you got an example of this where the Fwy/Expy isn't ending and no longer limited access?
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Re: Road Types (USA) – comprehensive overhaul of drivable ro

Postby bgodette » Tue May 13, 2014 3:51 pm

sketch wrote:A freeway can certainly end or begin at another type road, and many do. I thought of adding that a few days ago, but I wasn't near a computer.
This is what I was getting at with my early comment. Interstate/Fwy/Expy all have common occurrences of terminating into another road type, and it's usually the next step down in NFC.
sketch wrote:As for mid-freeway connections to major/minor highways, this is possible as well, especially at the beginning/end of a concurrency (say, when US-11 and I-59 run together for a time). This will be covered by this section of the Interchanges JSG, which is pending a rewrite. That's still a type of interchange, though. Interchanges may use non-ramp segments if they are freeway/highway splits, mostly to achieve visual continuity on the map, but the point is that it's an interchange and not an intersection.

If there's another type of junction you're concerned with, I'd like to know.
When a concurrency diverges I'm not sure we can really get away with not using ramps simply because there's usually a need for pathfinders, at least until we get that new feature.
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Re: Road Types (USA) – comprehensive overhaul of drivable ro

Postby bgodette » Wed May 14, 2014 4:08 am

vectorspace wrote:What conclude (for now) by looking in AZ to see what they did I see two things I will try to describe more in a bit:

(1) Phoenix, a rather large city, is comprised of a bunch of Minor Highways and Major Highways. This seems odd at first. It seems biased toward having Major Highways every half mile or every mile or so. Take a look. It seems highly differentiated.

(2) Rural areas of AZ currently seem biased to be less highways and more primary streets and streets. So the major arterial between distant cities can be primary streets. It seems under-differentiated.

So, does this make sense?
There used to be separate Urban/Ural FC guidelines until 2010(?) and the last directives were supposed to unify the two, however some states have either not completed that work or have yet to publish it to publicly accessible locations. If you've got FC maps that have Urban/Ural legends, it's the old system and judgment must be applied.

As far as inter-city connectivity goes, US/SR minimum typing tends to resolve that in most cases. Fixing failures of reasonable expected routes will be a judgement call based on local knowledge and "how would I get there looking at this paper map" ;) . Until we get in-editor annotations, exceptions are going to be an issue that can only be protected by higher locks and documenting in the state's wiki.
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Re: Road Types (USA) – comprehensive overhaul of drivable ro

Postby bgodette » Mon Feb 16, 2015 9:04 pm

txemt wrote:
voludu2 wrote:Then the style/best practice for this should also clearly state that any MPs which arise as a result should be closed "not identified", just to be clear that we aren't going to let an MP tell us what to do.


No, don't ever close an MP as "not identified." IGNs get involved then.
But would be unable to do anything since they cap out at L3.
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Re: Road Types (USA) – comprehensive overhaul of drivable ro

Postby bgodette » Mon Feb 16, 2015 10:04 pm

txemt wrote:I've seen them editing in various places, specifically places. I found a few segments (random) in dfw from December 2014, so they're still editing.
But not as a result of MPs, and for this particular issue of emergency access connectors between *ways, they would be unable to do anything if the *ways are locked as they should be.

The whole MP discussion is silly since the Wiki would have us not connect them which throws MPs just like not having the segment.
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Re: Road Types (USA) – comprehensive overhaul of drivable ro

Postby bgodette » Wed Feb 18, 2015 9:01 pm

qwaletee wrote:I thought reason originally made for mapping the turnarounds was to prevent pollution, and the no connection was to prevent routing onto them in extreme traffic.
That may be, and would work, but the disconnect would still throw MPs.
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Re: Road Types (USA) – comprehensive overhaul of drivable ro

Postby Bigbear3764 » Tue Apr 15, 2014 9:41 pm

CBenson wrote:What's wrong with davielde's sheet?


Can a second link for Illinois be added to that list? This one here is for the whole state and can be easier to pan around on: http://www.gettingaroundillinois.com/gai.htm?mt=fc

I haven't crossed checked all the counties, but one urban area in Chicago, the class is different between the PDF version and the whole state version.
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Re: Road Types (USA) – comprehensive overhaul of drivable ro

Postby bz2012 » Sat Feb 14, 2015 12:00 pm

Paragraph needing possible revision:
Emergency Vehicle and DOT Service Roads Service road.png[edit]
Emergency.jpg "Emergency and Authorized Vehicles Only" and DOT Service Roads are to be treated as Non-drivable roads. These are found primarily through the median of divided highways to connect opposite direction lanes. If mapped, they should not be connected to any drivable road, with properties set to road type Private Road, and lock the segment at as high a rank as possible, up to rank 5.

I believe the word I have shown in red above should be removed, or the rest of the sentence revised to remove the inherent contradiction (why bother to have it at all, if it is not connected to a drivable road and why bother to set it to private type?)
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Re: Road Types (USA) – comprehensive overhaul of drivable ro

Postby bz2012 » Sat Feb 14, 2015 7:18 pm

If we leave em out, sure as heck, some EMT or cop running Waze will use the turn around, and Waze will spawn a MR saying connect points A and B. :)
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