On 23/09/2019 09:14, Volker Schmidt wrote:



        every mapper can set his own, as you doe and I do, but this
        means that a router has to second guess what people think is
        standard use in different countries.

    That is exactly how it works.
    In general, tagging surface is almost
    always good idea or at least nice to do.

But this very unsatisfactory for routing. Two examples:
If I hire a rental car in the US, the contract ays, that I cannot use unpaved roads. If I useĀ  bicycle anywhere I would like to be able to instruct my router to avoid unpaved roads.

Ultimately, where information is missing, you as a data consumer will need to make a decision about whether or not a road is likely to be paved or not.

Adding a default (even per-country) won't magically make all non-surface-tagged roads paved or unpaved, and where data has come from import (e.g. TIGER in the US) or imagery (e.g. many places in Africa, Australia, etc.*) it isn't always possible to tell what the surface is when first adding to OSM.

Best Regards,

Andy

* and also some areas in the UK, where data was taken from OS OpenData before imagery/surveys were available - https://www.openstreetmap.org/#map=15/53.8724/-1.1287 being one such example.

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