[Talk-us] Trunk VS primary,

[Paul Johnson]

On Tue, Dec 17, 2019 at 7:24 AM Mike N <niceman at att.net> wrote:

>
>    I think many of the trunk VS motorway VS primary conflicts come from
> 2 points of view:  on the one hand, people like to zoom out and see a
> coherent network of interconnected roads.


In which case, rendering based on network on the route relations would be
more appropriate.


>    In the end, this would suffer from the same connectivity issue:
> should the US highway remain a trunk as it reduces to 2 lanes and drops
> to 30mph passing through a tourist area?   Would that tend to draw GPS
> navigation routes from nearby faster, parallel streets?


No.  What usually causes this is a regional speed limit where the local
speed is not yet known to OSM and/or priority signage hasn't been mapped
yet that obviate staying on the highway as the best route to the renderer
based on ground truth.


> Or would it
> look like an ugly gap in the trunk road if it switched to primary in
> that tourist area?
>

Depends on if you're rendering based on class or based on network.


>    As an aside, I sense that the tendency to upgrade results in all OSM
> streets being promoted by one level, resulting in a compression at the
> top end and less class distinction at those levels.
>

This tends to be the case.  Seems like based on the AK2 conversation, this
is a prolific problem in northern Canada, where roads are uncommon in
general.
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