[Talk-us] US Trunk road tagging

Thu May 6 20:49:02 UTC 2021

1
Full Access Control
Preference given to through traffic movements by providing interchanges with selected public roads, and by prohibiting crossing at-grade and direct driveway connections (i.e., limited access to the facility).
2
Partial Access Control
Preference given to through traffic movement. In addition to interchanges, there may be some crossings at-grade with public roads, but, direct private driveway connections have been minimized through the use of frontage roads or other local access restrictions. Control of curb cuts is not access control.
3
No Access Control
No degree of access control exists (i.e., full access to the facility is permitted).

This is what we use to define Access Control in HPMS. It is standardized across all State DOTs but it is somewhat subjective.

-----Original Message-----
From: Paul Johnson <baloo at ursamundi.org>
Sent: Thursday, May 6, 2021 4:23 PM
To: Zeke Farwell <ezekielf at gmail.com>
Cc: Minh Nguyen <minh at nguyen.cincinnati.oh.us>; talk-us <talk-us at openstreetmap.org>
Subject: Re: [Talk-us] US Trunk road tagging

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On Thu, May 6, 2021 at 3:04 PM Zeke Farwell <ezekielf at gmail.com<mailto:ezekielf at gmail.com>> wrote:

>

> On Thu, May 6, 2021, 3:25 PM Minh Nguyen <minh at nguyen.cincinnati.oh.us<mailto:minh at nguyen.cincinnati.oh.us>> wrote:

>>

>>

>> In traffic engineering jargon, "freeway" refers to a

>> controlled-access divided highway, while "expressway" refers to a

>> limited-access divided highway or sometimes a controlled-access

>> undivided highway ("super two").

>

> Minh, can you further explain the distinction between "limited-access" and "controlled-access"?  To me these terms seem synonymous.

Wikipedia has the best explanation that doesn't get too deep in the weeds.  Suffice to say controlled access would be what we tag as highway=motorway, with the exception that controlled access roads by definition cannot end or have at-grade intersections, and anyone suggesting highway=motorway should match that gets shouted down here.

https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FControlled-access_highway&data=04%7C01%7Cthomas.roff%40dot.gov%7C61f6061dd09d47d5b99708d910cd1f8a%7Cc4cd245b44f04395a1aa3848d258f78b%7C0%7C0%7C637559295567807629%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=nttd7pt0wawet0m%2F9kRkyjQS4YadwKqDzeBIyylEWrk%3D&reserved=0

Limited access is a bit more broad and also includes things like bicycle freeways.  https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FLimited-access_road&data=04%7C01%7Cthomas.roff%40dot.gov%7C61f6061dd09d47d5b99708d910cd1f8a%7Cc4cd245b44f04395a1aa3848d258f78b%7C0%7C0%7C637559295567807629%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=CXJwqB90i3drwHMBtGNxL7hcNBqEFc1%2FZ5PihILGphA%3D&reserved=0

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