[talk-au] Unclassified Highway Speeds

[Andrew Harvey]

How about your suggestion, assigning defaults based on urban/rural, which
you may be able to roughly assign based on buffering highway=residential?

Otherwise I think this will always be lacking in OSM until those maxspeed
tags are set.

In NSW we have some open data
https://opendata.transport.nsw.gov.au/dataset/speed-zones but the usual
issues about the accuracy of that data applies, but perhaps it could be
used to fill in the blanks?

On Tue, 19 Apr 2022 at 11:54, Andrew Hughes <ahhughes at gmail.com> wrote:

> Hi All,
>
> We're using OSM and pgrouting and it's GREAT!
>
> Something that I have found difficult to come to terms with, is assigning
> a "default speed" for unclassified roads (without a maxspeed tag). This is
> because in metro area's these are most-likely to be 50kph. However, out in
> regional areas these are likely to be 100kph.
>
> *Examples:*
>
> Unclassified Roads in Brisbane: Likely to be 50kph (default)
> https://overpass-turbo.eu/s/1hLK
>
> Unclassified Roads in Yorke Peninsula Council: Likely to be 100kph
> (default)
> https://overpass-turbo.eu/s/1hLL
>
> *Question:*
>
> What would be the best approach to achieving a more realistic speed given
> the above (while also taking into consideration the tagging guidelines)?
>
> Thanks in advance
> Andrew
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