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 <[email protected]> wrote: > Forwarding this email to the list, as it was held in moderation due to the > embedded images. > > ---------- Forwarded message --------- > From: Andrew Harvey <[email protected]> > Date: Tue, 23 Jul 2019 at 19:55 > Subject: Re: [talk-au] Road classification in AUS > To: Aleksandar Matejevic (E-Search) <[email protected]> > Cc: [email protected] <[email protected]> > > > Thanks for the examples. > > On Tue, 23 Jul 2019 at 19:27, Aleksandar Matejevic (E-Search) < > [email protected]> 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. > > _______________________________________________ > Talk-au mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/talk-au > -- Warm Regards Ewen Hill Internet Development Australia
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