[Talk-us] South Carolina State Highways - primary overload

[Greg Morgan]

On Tue, Dec 10, 2013 at 6:25 PM, Martijn van Exel
<martijn at openstreetmap.us>wrote:

>
> I think discussion can only be useful if and when we have a common
> understanding of what 'trunk', 'primary', 'secondary' etc. mean to us.
> I don't think we're anywhere close to that, looking at the various and
> partly mutually contradictory wiki pages on the topic:
>

I think this part of the tagging scheme that is the most puzzling issue for
US mappers.  In the Phoenix area,
http://www.openstreetmap.org/#map=11/33.5683/-112.0901, I've used primary
as a way of showing travelers what is the best way to get through all of
our mountain preserve areas. Since the traffic has to funnel through these
passages the amount of traffic that these roads has to handle probably
lines up with what a primary road should be.

I use residential for 0 to 25 mph residential roads.  That tag seems
obvious.

I use tertiary for 30 to 35 mph roads.  I see most of these types of roads
as connecting residential subdivisions.  These roads tend to have bike
lanes too.  I also see dashed yellow lines or two solid yellow lines as
another indication of changing the road to tertiary in mostly residential
areas.

I use secondary for 40 to 45 mph roads.

The roads that I have marked as primary are any where from 35 mph to 50 mph.

I use motorway for the major concrete highways.

This gives me a plan that I can follow with some consistency even if I
cannot say that it is the correct thing to do.  I ignore JOSM validation on
this question because there is no highway reference for tertiary,
secondary, and primary in most cases where I have used the tags.  However,
leaving a more than 25 mph road as residential seems like the wrong thing
to do.

I hope this helps,
Greg
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