Functional Classification in Mississippi

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Functional Classification in Mississippi

Postby jasonh300 » Fri Jul 25, 2014 3:14 pm

Mississippi editors, please reply to this thread to check in and to get notifications when there are posts or updates!

We are implementing Functional Classification in the state of Mississippi.

Functional classification is a system by which roads are classified using a set of criteria selected by the Federal Highway Administration (FHWA). These criteria include not only the physical attributes of the road but also efficiency of travel, number of access points, speed limits, route spacing, actual usage, and continuity. This can lead to quite different classifications for roads that appear similar. For example, a six-lane divided road in an urbanized area may be a Collector (Primary Street); a two-lane road through the middle of a town may be a principal arterial (Major Highway).
In Waze, functional classification is used to determine road type in the United States.

Functional classification is a national standard, but functional classification maps are published by state departments of transportation.

Experimentation over the past 6 months has shown that using these functional classification road typing schemes VASTLY improves Waze routing. It is now being implemented nationwide.

The Mississippi Functional Classification maps can be found here.

Below is a table that shows how to use the Waze road types to match the MDOT maps.

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In addition to setting the road type, care should be taken that these roads have been carefully examined for continuity. Go along each road and be sure that any connecting roads have proper turn permissions set, and that there are no gaps in coverage. Mississippi State Highways should be named in the MS-## format. U.S. Highways should be named in the US-## format. Divided highways should have the cardinal direction, and crossings (u-turns). At-grade connectors should be typed properly (the lesser of two types that it connects to). Uturns should be of Street type except in the case of "Michigan left" type uturns.

Only then should any area be marked "Complete". (list in next post)

Contact me or Sketch through PM to get the status of any area changed to "Complete".
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Re: Functional Classification in Mississippi

Postby jasonh300 » Fri Jul 25, 2014 3:31 pm

Items in Bold Green are complete. Items in Blue are currently being worked on with the name of the user working on it in parentheses. Please contact jasonh300 or Sketch via PM to update this list.

Urban areas
Biloxi-Gulfport
Hattiesburg
Jackson (bart99gt)
Memphis
Pascagoula

Small-Urban Areas
Aberdeen
Amory
Batesville
Booneville
Brookhaven
Carthage
Clarksdale
Cleveland
Columbia
Columbus
Corinth
Crystal-Springs
Forest
Greenville
Greenwood
Grenada
Hernando
Holly-Springs
Indianola
Kosciusko
Laurel
Leland
Louisville
McComb
Meridian bart99gt
Natchez
New-Albany
Oxford (coldillusions)
Philadelphia
Picayune
Pontotoc City
Ripley
Senatobia
Starkville
Tupelo (coldillusions)
Vicksburg
Waynesboro
West Point
Winona
Yazoo City

County list

Adams County
Alcorn County
Amite County
Attala County
Benton County
Bolivar County
Calhoun County
Carroll County (CrackedLCD)
Chickasaw County
Choctaw County
Claiborne County
Clarke County
Clay County
Coahoma County
Copiah County (majorjc_MS)
Covington County
DeSoto County
Forrest County
Franklin County
George County
Greene County
Grenada County
Hancock County (jasonh300)
Harrison County (jasonh300)
Hinds County
Holmes County
Humphreys County
Issaquena County
Itawamba County
Jackson County
Jasper County
Jefferson County
Jefferson Davis County
Jones County
Kemper County
Lafayette County
Lamar County
Lauderdale County
Lawrence County
Leake County
Lee County (coldillusions)
Leflore County (CrackedLCD)
Lincoln County
Lowndes County
Madison County
Marion County
Marshall County
Monroe County
Montgomery County
Neshoba County
Newton County
Noxubee County
Oktibbeha County
Panola County
Pearl River County
Perry County
Pike County
Pontotoc County
Prentiss County
Quitman County
Rankin County (majorjc_MS)
Scott County (majorjc_MS)
Sharkey County
Simpson County (majorjc_MS)
Smith County (majorjc_MS)
Stone County
Sunflower County
Tallahatchie County
Tate County
Tippah County
Tishomingo County
Tunica County
Union County
Walthall County
Warren County
Washington County
Wayne County
Webster County
Wilkinson County
Winston County
Yalobusha County (CrackedLCD)
Yazoo County
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Re: Functional Classification in Mississippi

Postby tel601 » Fri Aug 01, 2014 3:22 am

Picayune- complete pearl river county - complete
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Re: Functional Classification in Mississippi

Postby jasonh300 » Sun Aug 03, 2014 6:27 pm

For those of you working on the Functional Classification Project, please take a look at this post for some tips, based on a lot of the problems I'm finding in both edited and unedited areas. This is not directly related to functional classification, but it's good info for general cleanup.

https://www.waze.com/forum/viewtopic.php?f=596&t=103359
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Re: Functional Classification in Mississippi

Postby sketch » Thu Aug 21, 2014 4:09 am

By the way...

US and state highway systems also play a part in road type. Functional class and highway system each determine the minimum type a road should be. This chart, along with the text of the article it's in, should help you to understand how it works, but keep in mind that Mississippi's handling of rural major collectors is different than some states'. (Also, I don't think Mississippi's usage of county roads really justifies setting them all to at least PS.)

Sorry for any confusion, and sorry if you have to go back and re-edit certain areas now. I can offer a hand in that. Let me know if you have any questions. I can create a Mississippi-specific version of that chart if you think it would be helpful.
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Re: Functional Classification in Mississippi

Postby sketch » Thu Aug 21, 2014 5:06 am

I went ahead and created that Mississippi-specific chart. Hope it helps.

https://wiki.waze.com/wiki/Mississippi# ... ence_chart
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Re: Functional Classification in Mississippi

Postby bart99gt » Sat Aug 23, 2014 2:42 am

Just so I have this straight...

https://www.waze.com/editor/?env=usa&lo ... 925&zoom=3

This is about a mile from my house, and happens to be right on the border between the Memphis urban area map and the DeSoto County rural classification map.

Pleasant Hill Rd on the urban map is classified as a minor arterial route, but on the county map, it is a major collector. So now, to stay consistent with the urban classification, I should upgrade it to a minor highway as well? IMHO, this one probably should be a mH all the way to I-55 anyway as it more or less is an arterial route through that part of the county.

Now, take this example:
https://www.waze.com/editor/?env=usa&lo ... 925&zoom=4

Wheeler Rd never enters an urban area, and is designated as a Major collector, and I've had it marked as a primary street. Now, according to the chart this should be a minor highway? Or should it just depend on what we judge the importance of the street to be and classify them as mH/PS as appropriate?
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Re: Functional Classification in Mississippi

Postby sketch » Sat Aug 23, 2014 2:44 am

Hmm – OK. I was just keeping the rule as Jason had written it, but I think it's a better idea to default to the lower of the two types, unless the road becomes the higher of the two as it enters an urban area.
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Re: Functional Classification in Mississippi

Postby bart99gt » Sat Aug 23, 2014 3:44 am

OK, he and I had a discussion about that earlier, I just wanted to make sure something hadn't changed.
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Re: Functional Classification in Mississippi

Postby bart99gt » Tue Dec 16, 2014 12:23 am

I made an edit to one of the footnotes on the FC chart to clear things up a bit. I've seen a few sections of road that were improperly classified and I think it may be due to some confusion about how to interpret the chart.

Basically, as per the discussion above, if there is more than one choice in the chart, default to the LOWER of the two.

My personal preference is to carry the urban classification (if it is higher than the surrounding rural one) out far enough to provide a transition from the urban to rural environment (if someone needs examples, just ask), and to keep a road from changing classification(s) back and forth because it skips in and out of an urban area.

Remember, the chart is a MINIMUM classification. If you feel, that in your judgement, that a road should be classified higher, then do so. These maps only get updated every few years, so roads may have been widened, reconfigured, etc...
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