Road classification update

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Re: Road classification update

Postby lelehman » Sat Nov 02, 2013 7:23 am

Detroit is going to end up about as intense as NOLA, from the looks of it. I've started on the area that I have access to at the moment. This is what it looks like after I finished (or almost, anyway) adding the major highways. Here's what I'm basing it from - I have never before wished for a clearer PDF. ;) Should I move on to adding the minor highways and such, or downgrade most of these back to minor highways/primary streets? There was very little distinction between road types before I started this, and at the very least we might be able to get a good amount of feedback on how the routing is working. Agreed, it looks kinda ridiculous, but I can see how it would work pretty well. Since the NFC maps were updated in 2012 and should be fairly accurate, I'm willing to try this on a larger scale, if other Michigan editors are in agreement.

EDIT 11/3/13: Another editor reset about half the roads I had edited back down to primaries/minor highways, but basically anything you see as a minor highway in this area is a major highway on the NFC map.
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Re: Road classification update

Postby keeegs » Tue Dec 31, 2013 3:30 am

miked_64 wrote:Captnkeegs - It looks to me like the v13 Kent Co. map follows this color scheme as well. Is it possible that you have an old link?

http://mdotcf.state.mi.us/public/maps_nfc/pdf/NFC13_KENT.pdf


Ah Yep you were right, I had an old PDF saved on my desktop.
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Re: Road classification update

Postby keeegs » Thu Dec 19, 2013 4:06 am

miked_64 wrote:So now do the colors/descriptions map as this?

NFCWaze Map Editor
Blue - InterstateBlue - Freeway
Purple - FreewayBlue - Freeway
Red - Principle ArterialRed - Major Highway
Brown - Minor ArterialYellow - Minor Highway
Orange - Major CollectorOrange - Primary Street
Green - Minor CollectorOrange - Primary Street
Grey – LocalWhite – Street


Be careful, colors for classifications can change between counties.

Kent county for example switches the colors between Minor Arterial and Minor Collector.
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Re: Road classification update

Postby hitfactor » Thu Jul 24, 2014 12:51 am

I have been working Berrien, Van Buren and Cass counties. There are small areas on the east sides of Cass and Van Buren I can't edit. So I can't call them complete. The segments I can edit lead right up to the edge of my capabilities and continue out the other side, so they are fairly obvious.

I'll probably drive out to east Cass county in the next week or two and pickup the remaining area I can't edit then.
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Re: Road classification update

Postby davielde » Wed Jul 23, 2014 1:52 am

miked_64 wrote:St Joe County and Calhoun county where I have AM privileges are now fully NFC'd. Are we tracking progress here or in the spreadsheet?

Both?
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Re: Road classification update

Postby davielde » Mon Feb 10, 2014 2:16 am

I started an inventory of NFC for each MI county on Friday afternoon. The link to the shared Google spreadsheet is available in the To Do List section of the Michigan wiki page: https://www.waze.com/wiki/Michigan#To-do_Lists

I've only had a chance to go through eight counties so far, so it will likely be a few weeks before everything is checked. The methodology that I'm using is to start at the highest road type, check to make sure everything is assigned properly, and then move to each subsequent type. If I find a road type incomplete, I'm simply marking the county as needing further review and moving to the next county. You can add comments to the doc, but PM me if you would like to make direct edits, and I can adjust the file permissions.

I'm using green for counties that look complete for the v13 maps, yellow for needing future review, and red for counties that look like they have not been touched.
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Re: Road classification update

Postby davielde » Sun Feb 02, 2014 4:35 am

I drafted a few paragraphs regarding the NFC classifications for possible inclusion on the Michigan wiki page. If anyone has any feedback or suggestions for edits, please let me know. It is mostly geared toward just providing a summary of the NFC to Waze road type mapping as well as a list of the exceptions where the NFC classification would be trumped by other considerations. The work-in-progress draft is currently located on my wiki profile page here.

I haven't noticed many editors changing road types recently back to match the main wiki road types, which is good. Then again, everything in Ann Arbor minor highway or above is now locked at 3... This documentation would help anyone new who happened to check the Michigan page prior to editing (like they should) understand the divergence from the wiki standard.
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Re: Road classification update

Postby davielde » Mon Dec 30, 2013 9:58 pm

Boiler_81 wrote:I think it would be helpful if we coordinated editing the Detroit metro area. If people would list in this thread the areas they have edited and are working on it would help us from bumping into one another and analyzing areas which have already been done.


With regard to metro Detroit alone, I believe that everything in Wayne county has been completed from major collector on up with the exception of the Downriver area. That was using the v12 maps though. I have not compared the road types to the v13 maps for Detroit in detail to see how much they may differ. Here's a line showing the area south of Northline Rd down into Monroe county that still needs to be completed. I mostly focused on upgrading road types for Wayne and Oakland counties that were west of the Southfield Fwy, north of Northline Rd, south of Maple Rd, and into Washtenaw and Livingston counties. Binkowski and sketch would be able to give the best answer for how complete Oakland and Macomb counties are since they did most of the work there.
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Re: Road classification update

Postby davielde » Wed Dec 11, 2013 8:59 pm

It looks like the Michigan NFC maps have been updated today to "v13". The urban/rural distinction is now clearer, but the colors changed, so be careful. Particularly with regard to the brown "minor arterial" versus grey local roads, I find it almost impossible to distinguish unless highly zoomed in. Green has now changed to minor collector instead of minor arterial. On a good note, the higher available resolution when zoomed in is a bonus.
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Re: Road classification update

Postby davielde » Tue Nov 19, 2013 6:21 am

The document is a snoozer in general, but here is a detailed explanation of how the FHWA suggests roads be classified functionally. Skip to tables 3-5 and 3-6 on pages 22 and 23 of the memo (pages 28 and 29 of the PDF) for the summary.

http://www.michigan.gov/documents/mdot/ ... 6823_7.pdf

The Federal Highway Administration provides a breakdown of guidelines for individual states to adopt as they see fit, and the state classifications are then sent back to the FHWA for approval. There are a lot of uses of "in general" and "typically" when describing how factors such as number of access points, mileage extent, Vehicle Miles of Travel (VMT), Annual Average Daily Traffic (AADT), route spacing, speed limit, efficiency of travel, etc. come into play. This unfortunately translates to a lot of grey area in the interpretation, which MDOT apparently had no qualms about taking advantage of when it came to classifying arterials in the Detroit area.

The NFC uses a percentage model where a wide-ranging percent of each road type needs representation, and this varies from a rural to urban setting. Efficiency is the key consideration. For an urban "other principal arterial", efficiency in the ability to route over a longer distance is actually more important than traffic volume stats and other factors. The summary describes it as a "high proportion of total urban travel on minimum of mileage", but volume (AADT) is ultimately a result of greater efficiency, not the cause. Given two identical roads and the need to classify one as a principal and the other as minor though, the guidelines state that AADT would be the "tie-breaker". In addition, the number of access points are "typically" based on the desired classification, and speed limit is "typically" higher as a result of fewer at-grade connections.

With that said, there are general rules laid out in tables 3-5 for arterial classification. Urban principal arterials should make up 4%-5% of the physical miles but carry 16%-31% of the traffic, and urban minor arterials should make up 7%-14% of the physical miles and carry 14%-25% of the traffic. AADT volume can range from 7k to 27k for an urban principal arterial whereas an urban minor arterial can range from 3k to 14k. Notice that nice overlap from 7k at the low range of principal to 14k at the high range of minor. It's almost of if staff at the FHWA realized they needed to put something out there, but they didn't really care since the states would be doing all the work according to their local understanding... This setup unfortunately leads to a lot of standardization within the state but not necessarily much from state to state. To continue to illustrate how flexible this is, access can be partially controlled for a principal, or it could be completely uncontrolled just like a minor. It could be either divided or undivided. Interestingly, lane width, shoulder width, and access are taken into consideration as guidelines for arterials; but items such as the number of lanes, speed limit, etc. are "typically" the result of the classification as work is done to make the route more efficient over time. Maybe that's why they added those roundabouts to Maple Rd and 14 Mile in Farmington, both of which are classified as principal arterials for those stretches...

At the end of the day though, the point is that there is a lot of overlap and room for uncertainty. MDOT made a judgment for Michigan based on these vague guidelines, but at least the result is able to be translated easily to a map. Hopefully this at least provides a better understanding of the "how" and "why" of certain classifications in a lot of cases where they may not otherwise be intuitive.
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