<HTML><BODY><div class="js-helper js-readmsg-msg"><style type="text/css"></style><div><div id="style_15858716431460868528_BODY"><div class="class_1585901166"><div dir="ltr"><div style="color:#0000ff; font-family:'Times New Roman'; font-size:12pt"><div>In the united states, chicago a stop position depends on who is driving the train and</div><div> </div><div>how many cars.</div><div> </div><div>so 6 cars 1 engine or 8 cars 1 engine.</div><div style="color:#000000; display:inline; font-family:"Calibri"; font-size:small; font-style:normal; font-weight:normal; text-decoration:none"><div style="font:10pt tahoma"><div> </div><div style="background:#f5f5f5"><div style="font-color:black"><b>From:</b> <a title="joseph.eisenberg@gmail.com">Joseph Eisenberg</a></div><div><b>Sent:</b> Thursday, April 2, 2020 6:04 PM</div><div><b>To:</b> <a title="dancer@sprynet.com">Jack Armstrong</a></div><div><b>Cc:</b> <a title="talk@openstreetmap.org">OSM</a></div><div><b>Subject:</b> Re: [OSM-talk] Question regarding public_transport=stop_position</div></div></div><div> </div></div><div style="color:#000000; display:inline; font-family:"Calibri"; font-size:small; font-style:normal; font-weight:normal; text-decoration:none">This sort of question might be more appropriate for the "Tagging" or<br>public transport mailing lists.<br><br>But yes, there is no need to add public_transport=stop_position nodes<br>on a highway or railway to show where a train or bus stops, if there<br>is a highway=bus_stop or railway=platform which is mapped right next<br>to the highway or railway, and it is clear that the bus or train stops<br>at the closest point of the highway to the bus stop or platform.<br><br>Since most bus stops do not have stop_position nodes, any public<br>transit routing application will need to be able to deal with this<br>situation.<br><br>However, this issue is controversial, and I'm not surprised that you<br>are finding conflict when removing the nodes. Generally, I would<br>ignore them rather than taking the time to delete them, unless they<br>are make it difficult to edit other features.<br><br>There is a long, complex history of how public transit features are<br>tagged in OpenStreetMap. From what I've read, originally almost all<br>bus stops were tagged with highway=bus_stop nodes next to the highway,<br>at the location of the bus stop sign, but railway=tram_stop nodes were<br>mapped directly on the railway way, with the platform sometimes mapped<br>separately (if there is a platform - sometimes a tram just stops in<br>the middle of the street and passengers have to walk across to it from<br>the sidewalk).<br><br>This bothered some mappers who wanted to import public transit data<br>from their local database, which had all of the nodes mapped on the<br>railway or highway way. Some started mapped highway=bus_stop with a<br>node on the highway way, but this lost the information about where the<br>passengers actually should wait. So, someone who wanted nodes on the<br>ways proposed public_transport=stop_position for every highway and<br>railway position where a train or bus stops, and<br>public_transport=platform as a synonym for highway=bus_stop or<br>railway=platform.<br><br>While some mappers accepted that proposal and started mapping 2 nodes<br>for every single train stop and platform, most bus stops have<br>continued to be mapped as only a highway=bus_stop node, and<br>public_transport=stop_position is rarely used for buses. Generally the<br>public_transport tags are only used in addition to the original tags.<br><br>So it's correct to say that the public_transport tags are almost never<br>needed. In particular, public_transport=stop_position is very rarely<br>useful.<br><br>(In very rare cases there might be a service road which loops around<br>behind a bus stop and it might be unclear if the bus stops on the<br>service road or the main highway - but this would very rarely matter<br>for public transit riders and general map users. It might matter for<br>bus drivers, but they should use a separate database which includes<br>this information.)<br><br>-- Joseph Eisenberg<br><br><br>On 4/3/20, Jack Armstrong <<a href="/compose?To=jacknstacy@sprynet.com">jacknstacy@sprynet.com</a>> wrote:<br>> The wiki for public_transport=stop_position states, “If the stop on the<br>> public transport route has a defined platform, there is no benefit in adding<br>> public_transport=stop_position. In these cases, do not use<br>> public_transport=stop_position to avoid duplication of information and<br>> confusion.” You can see the wiki page here:<br>> <a href="https://wiki.openstreetmap.org/wiki/Tag:public_transport%3Dstop_position" target="_blank">https://wiki.openstreetmap.org/wiki/Tag:public_transport%3Dstop_position</a><br>><br>><br>> The conversations on the wiki discussion page seem to agree that<br>> stop_position is not needed where a defined platform exists.<br>><br>><br>> I’m mapping railway and light-rail in a metropolitan area. Following the<br>> above wiki statement, I have removed stop positions where “defined<br>> platforms” are located. My goal is to follow the wiki, to…the…letter.<br>> Honestly, I don’t have a preference as to which manner railways are mapped.<br>><br>><br>> Recently, another user has contacted me. This user is unhappy that the stop<br>> positions have been removed. I’ve explained that the wiki states, “…do not<br>> use public_transport=stop_position to avoid duplication of information and<br>> confusion.”<br>><br>><br>> The user who sent me the complaint has directed me to this diagram:<br>><br>> <a href="https://wiki.openstreetmap.org/wiki/Railway_stations#Overview" target="_blank">https://wiki.openstreetmap.org/wiki/Railway_stations#Overview</a><br>><br>><br>> Is the wiki correct? Are we not using stop_position where a defined platform<br>> exists? If this is incorrect, should the wiki be changed?<br>><br>><br>> Again, my only goal is map correctly,<br>><br>><br>> Thanks :)<br>><br>><br>><br>><br>><br>><br><br>_______________________________________________<br>talk mailing list<br><a href="/compose?To=talk@openstreetmap.org">talk@openstreetmap.org</a><br><a href="https://lists.openstreetmap.org/listinfo/talk" target="_blank">https://lists.openstreetmap.org/listinfo/talk</a></div></div></div></div></div></div></div><div> </div></BODY></HTML>