<div dir="ltr">Hello from a neighbor just south of your border! The wiki page at <a href="https://wiki.openstreetmap.org/wiki/United_States/2021_Highway_Classification_Guidance">United States/2021 Highway Classification Guidance</a> provides an overview of the changes we're making to highway classification in the US. <br><br><div>Regarding the highway=trunk tag -- this has historically in the US (and Canada to some extent) been used to mean "expressway construction, but not quite motorway" rather than being a network-importance signifier as it is in the UK highway system that OSM is based on. <br></div><div><br></div><div>This trunk == expressway way of tagging causes two problems:<br><ol><li>No way to identify high importance, long distance roads that are of two-lane construction.</li><li>No way to filter out urban expressways at low zooms. Cities become a smear of roads.<br></li></ol>When followed rigorously, this older trunk == expressway way of tagging has had the unfortunate effect of leaving no way to identify high importance roads that should be shown on continent-scale maps when those roads are built as two-lane highways with at-grade intersections. This has left low-zoom maps of the US with a patchwork of roads around cities and big gaps in between.<br></div><div><br></div><div>The second problem with the trunk == expressway way of tagging comes when urban expressways are <i>also</i> tagged with highway=trunk to indicate their enhanced infrastructure. This tagging forces renderers to include these urban expressways at too low of a zoom, making urban areas a smear of roads. In the US we're shifting to use the expressway=yes tag to indicate this enhanced infrastructure while leaving the highway=* tag to indicate network importance. Thus, an urban expressway that connects between suburbs may be tagged highway=primary+expressway=yes to indicate both its more local network importance as well as its enhanced infrastructure.<br></div><div><br></div><div>In general, Canadian tagging is starting from a much closer alignment to this new US-specific guidance than our own tagging is. Canada has many examples of two-lane highways that connect long distances through sparsely-populated areas. Many of these two-lane Canadian highways (for example, <a href="https://www.openstreetmap.org/relation/5501463">Ontario Highway 11</a>) are currently tagged highway=trunk in a way that aligns with the network-importance scheme. Still, there are a number of cases where important regional connections aren't tagged highway=trunk yet or where less-important urban expressways are still tagged as highway=trunk. <br><br>One example that should likely be fixed is <a href="https://www.openstreetmap.org/#map=13/45.0807/-73.0971">Route 133</a> between the not-yet-completed Autoroute 35 and Vermont's I-89. It is currently tagged as highway=primary in its two/three-lane section and highway=trunk in its expressway section. Given this road is a non-motorway connection between two motorways and connects Montreal to Burlington & Boston it would likely have a "trunk" importance in the network.</div><div><br></div><div>Best,</div><div>Adam<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 8, 2022 at 9:36 AM Martin Chalifoux via Talk-ca <<a href="mailto:talk-ca@openstreetmap.org">talk-ca@openstreetmap.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;">I feel the same as you do John, and I also like the way it is right now. So I would like to understand the issues they want to fix and I don’t get it yet. As the saying goes, it if aint broken don’t fix it. <br><div><br><blockquote type="cite"><div>On Feb 8, 2022, at 09:28, john whelan <<a href="mailto:jwhelan0112@gmail.com" target="_blank">jwhelan0112@gmail.com</a>> wrote:</div><br><div><div dir="auto">I suspect it all stems from the roots of OSM. A UK motorway is quite different to a Canadian one and there has been lots of discussion about classification of primary, motorway, trunk etc. in various countries.<div dir="auto"><br></div><div dir="auto">Personally I quite like the existing tagging and don't really see the need to retag everything.</div><div dir="auto"><br></div><div dir="auto">It isn't clear to me what the advantage of retagging everything is.</div><div dir="auto"><br></div><div dir="auto">You loose the sense of local ownership if you move to standardised tagging and in this case where it is not black and white I fail to see any advantage.</div><div dir="auto"><br></div><div dir="auto">Cheerio John</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 8, 2022, 09:15 Martin Chalifoux via Talk-ca <<a href="mailto:talk-ca@openstreetmap.org" rel="noreferrer noreferrer" target="_blank">talk-ca@openstreetmap.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Miguel, maybe I missed something, what is the issue with the trunk designation to start with ? What is broken that you want to fix ? You seem to want to avoid the trunk tag altogether and move everything up to motorway or down to primary as if trunk was improper. <br>
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