[talk-au] Road classification in AUS

Tue Jul 23 13:16:06 UTC 2019

Just an update on Motorways. Australia has very few and most of these are
normally mapped correctly already. The Bass Highway in Victoria is not a
motorway as a number of roads enter at 90 degrees as well as driveways.
There is definitely no motorway through the townships of Cranbourne and
Tooradin as well as other towns. This is a Trunk road as it a key route to
west Gippsland towns.

The only time you would need to change to a motorway is for upgrades to
highways and local knowledge will do that for you.

Thanks for all your edits

Ewen

On Tue, 23 Jul 2019 at 22:07, Andrew Harvey <andrew.harvey4 at gmail.com>
wrote:

> Forwarding this email to the list, as it was held in moderation due to the
> embedded images.
>
> ---------- Forwarded message ---------
> From: Andrew Harvey <andrew.harvey4 at gmail.com>
> Date: Tue, 23 Jul 2019 at 19:55
> Subject: Re: [talk-au] Road classification in AUS
> To: Aleksandar Matejevic (E-Search) <v-maalek at microsoft.com>
> Cc: talk-au at openstreetmap.org <talk-au at openstreetmap.org>
>
>
> Thanks for the examples.
>
> On Tue, 23 Jul 2019 at 19:27, Aleksandar Matejevic (E-Search) <
> v-maalek at microsoft.com> wrote:
>
>> *Motorway or Trunk: **-38.3999033,145.5370408*
>> <https://www.openstreetmap.org/search?query=-38.3999033%2C145.5370408#map=16/-38.4011/145.5388>
>>
>>
>>
>>
>> Follow this Mapillary.
>>
>>
>> https://www.mapillary.com/app/?lat=-38.39942489999999&lng=145.5372489&z=19.64334424490615&focus=photo&pKey=QjkvLvLb1fNa_SNzVpbcgw
>>
>>
>>
>>
>> This is [M420], motorway which enters the town. Should the part
>> through the town be mapped as trunk or to keep it as motorway, because when
>> it leaves town it is for sure motorway but in town it does not fulfill the
>> description of motorway, also it has traffic signals.
>>
>
> According to the OSM wiki highway=motorway is for a controlled access
> highway, which wikipedia says:
>
> "A controlled-access highway provides an unhindered flow of traffic, with
> no traffic signals <https://en.wikipedia.org/wiki/Traffic_signals>,
> intersections <https://en.wikipedia.org/wiki/Intersection_(road)> or property
> access <https://en.wikipedia.org/wiki/Frontage>. They are free of any at-grade
> crossings <https://en.wikipedia.org/wiki/At-grade_intersection> with
> other roads, railways, or pedestrian paths, which are instead carried by
> overpasses <https://en.wikipedia.org/wiki/Overpass> and underpasses
> <https://en.wikipedia.org/wiki/Underpass>. Entrances and exits to the
> highway are provided at interchanges
> <https://en.wikipedia.org/wiki/Interchange_(road)> by slip roads (ramps),
> which allow for speed changes between the highway and arterials
> <https://en.wikipedia.org/wiki/Arterial_road> and collector roads
> <https://en.wikipedia.org/wiki/Collector_road>. On the controlled-access
> highway, opposing directions of travel are generally separated by a median
> strip <https://en.wikipedia.org/wiki/Median_strip> or central reservation
> containing a traffic barrier
> <https://en.wikipedia.org/wiki/Traffic_barrier> or grass. Elimination of
> conflicts with other directions of traffic dramatically improves safety[1]
> <https://en.wikipedia.org/wiki/Controlled-access_highway#cite_note-1> and
> capacity."
>
> Based on this, the Bass Highway is trunk not a motorway (it has traffic
> lights, roundabouts, it doesn't provide onramp/offramps), so I think you
> need to revert your recent tag change to this road, not just for the
> sections through towns, but for the whole road.
>
>
>>
>> *Trunk or Primary: **-34.8378323, 138.5029666*
>> <https://www.openstreetmap.org/search?query=-34.8378323%2C%20138.5029666#map=18/-34.83795/138.50335>
>>
>>
>> We will follow the [A16] route from junction Victoria Road – Nelson
>> Street. These two roads are on the same [A16] route. Victoria Road is
>> mapped as Trunk, but Nelson Street is set as Primary Road.
>> These both roads look almost the same – two separate ways with two or three
>> lanes, no barrier in between:
>>
>>
>>
>> *Nelson Street*
>>
>>
>> https://www.mapillary.com/app/?focus=photo&pKey=kJLW93dqu0t4cM34Al4wtA&lat=-34.83935459862475&lng=138.4998110442043&z=17
>>
>>
>>
>>
>> *Victoria Road*
>>
>>
>>
>>
>> https://www.mapillary.com/app/?focus=photo&pKey=fqlFms86fTiE-ODwBcrHhQ&lat=-34.83792630649351&lng=138.50419954805196&z=1.8746717329999287
>>
>>
>>
>>
>> The only difference is road type (Road vs Street). But, route [A16] then
>> continues in Semaphore Road, which also looks exactly the same as
>> previous two roads, but it is mapped as Primary Road. This street to me
>> also looks as trunk. Part of Semaphore Road which is not on [A16] route is
>> mapped as *secondary*, but it looks like a *primary* road. In this
>> case, should Semaphore Road be mapped as trunk – primary, instead of
>> primary – secondary?
>>
>
> It's not just the physical condition of the road, but also how important
> that road is from the road network perspective, so generally the more
> traffic the road gets and the more "important" it is in terms of linking
> major centres together, then the higher the classification. So in that way,
> two roads which look the same can have different classification based on
> their importance in the road network.
>
>
>>
>>
>> Next case, on [A16] route, *Causeway Road* is definitely a primary road.
>>
>>
>>
>>
>>
>>
>> https://openstreetcam.org/details/1341011/254/track-info
>>
>>
>>
>> Further on, [A16] continues to *Bower Road*, which looks like a trunk
>> road, but it’s mapped as a primary.
>>
>>
>>
>>
>> https://www.mapillary.com/app/?focus=photo&pKey=_jlpimXN_-a17Mt8E92wRg&lat=-34.852086664809406&lng=138.49658016539593&z=17
>>
>>
>>
>>
>> These all roads are on the same [A16] route.
>>
>>
>>
>> If we compare what is written here
>> https://wiki.openstreetmap.org/wiki/Key:highway with M, A, B, C routes
>> then we find that A route, in most cases, primarily consists of trunks.
>> Putting Causeway Road on a side, all other mentioned roads look the same,
>> but only one of them is mapped as trunk. Should all of them be turned into
>> trunks? If yes, what to do with Causeway Road? Turn it into trunk because
>> of A route or leave it as is?
>>
>
> I would ignore the A, B, C etc. classification, and instead map based on
> the road importance within the network. Indeed that's exactly how
> https://wiki.openstreetmap.org/wiki/Key:highway describes the tag values
> as different levels of importance within the road network in connecting
> places.
>
> I wouldn't concern myself too much with what official data says, nor with
> the ref numbers, instead go with local knowledge of the road importance.
>
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-- 
Warm Regards

Ewen Hill
Internet Development Australia
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