[Talk-us] US Trunk road tagging

[Zeke Farwell]

On Thu, May 6, 2021 at 4:49 PM Roff, Thomas (FHWA) <Thomas.Roff at dot.gov>
wrote:

>
>
> *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).
>

Thank you, Thomas.  This is the clearest distinction I've seen yet.

It seems to me that with regard to freeways, expressways, parkways,
motorways, super twos (and other names) people seem to care about
distinguishing two main things:  1) divided or not, 2) degree of access
control.  Looking at TagInfo I see there are tags with some usage for each
of these things and I'd suggest we start using them more heavily:

https://taginfo.openstreetmap.org/keys/dual_carriageway
https://taginfo.openstreetmap.org/keys/access_control

So highway=motorway implies dual_carriageway=yes and access_control=full.
Lower classes of highway= can have access_control=full|partial|none and
dual_carriageway=yes|no.  Tagging dual carriageway explicitly feels a bit
redundant since we draw two ways, but it would allow a rendering variation
and probably make some other things easier for data consumers.
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