[Talk-us] "System Continuity" in the Functional Classification network

[Greg Troxel]

Frederik Ramm <frederik at remote.org> writes:

> Hi,
>
> On 07.09.2017 16:51, Max Erickson wrote:
>> Broadly speaking, yes, such continuity should apply. Maybe not using
>> exactly the same rule as the US DOT.
>
> I know this is talk-us and I won't attempt to say anything USA specific
> but such continuity definitely does not apply world-wide in OSM (there
> have been cases where people tried to enforce such continuity without
> local knowledge only to be repudiated by locals).

I also don't think there is a continuity notion in the US in OSM.

In particular, in the US, we have a notion of primary is a US highway
(or a state highway that is equally important).   So a continuity
property in OSM tagging tends to follow from continuity in the
underlying networks.

trunk, however, is special.  It more or less means "primary which is
50-90% of the way to motorway".  So that means there are stretches where
it changes, and that's ok.  (it shouldn't change every one mile, but 5
miles is defintely normal)

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