[talk-au] Road classification in AUS

Warin 61sundowner at gmail.com
Thu Jul 25 23:56:47 UTC 2019

On 25/07/19 23:06, Sebastian S. wrote:
> Hi Aleksandar,
> Just in case you have not reviewed it, there Is a wiki page Australian 
> tagging guideline 
> https://wiki.openstreetmap.org/wiki/Australian_Tagging_Guidelines
> However Regarding your question 1 mayor road classification has always 
> been a no-go for me.
> E.g. A8 Pittwater Road, North of Sydney, NSW.
> It is an 'A' road according to Wikipedia these As are "primary 
> highways, including urban arterials and interstate or interregional 
> single carriageways."
> Now for the most part the A8 has two or more lanes that are separated, 
> however the road is also lined with intersections with red lights, 
> driveways and houses. It is an important and high capacity road.
> While the first points to me indicate it should be highway=trunk the 
> last points make me think it should be highway=primary.
> As I often find myself in similar dilemmas I tend to not change the 
> classification.

For some guidance in NSW the LPI Base Map can be of help.
As an example I use it for tertiary versus unclassified as these tend 
not to have physical differences but the importance to the local 
community is the thing that changes them.
> Aside from providing some examples of your cases I ask you what is 
> your driver to look at the road classification and see the need to 
> revise it?
> What are the benefits of a road changing between trunk and primary? 
> What does it do for map users and data consumers?

I would think that routers will pay some attention to the road 
classification, assuming the higher one would be preferred for a faster 
trip (less side entrances, stop etc).
> The way I understand your email you refer to major review of the 
> classification and not a fix if a single local point.
> Or do you consider the classification of (some) roads that wrong that 
> you can't live with it?
> Curious, Sebastian
> -- 
> Sent from my Android device with K-9 Mail. Please excuse my brevity.
> On 23 July 2019 12:50:19 am AEST, "Aleksandar Matejevic (E-Search) via 
> Talk-au" <talk-au at openstreetmap.org> wrote:
>     Hi all,
>     My name is Aleksandar Matejevic, I work for Microsoft OSM
>     Editorial team. In order to make the best decision in classifying
>     roads across Australia, I need some help.
>     In government data and on signposts you can find on mapillary
>     and/or open street cam, you can track route numbers. I found out
>     that routes mostly consist of:
>     M route – motorways
>     A route – trunks
>     B route – primary roads
>     C route - secondary roads
>     As long you map in non-urban area this is 99.99% true, but when
>     you map into city area it starts to get confusing.
>     On this wiki page
>     _https://en.wikipedia.org/wiki/Highways_in_Australia_ there is no
>     real explanation how to classify AUS roads in OSM
>     If you strictly follow this page:
>     _https://wiki.openstreetmap.org/wiki/Key:highway_ than you should
>     change road classification several times on the same route way.
>     Therefore I have a couple of questions:
>     1. Do you change the classification of highway on the motorway
>     route into trunk through the city because it does not have a
>     physical barrier in between (not restricted access) or do you keep
>     it as motorway because of consistency?
>     2. If we were to change the road classification several times
>     during one route way, should we ignore segments that are less than
>     3km (for example motorway going through minor city in which it has
>     a quality of trunk)?
>     3. Can motorway have some traffic signals when passing through city?
>     4. How to classify State routes (for example in Melbourne)?
>     Best regards,
>     Aleksandar
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