<div dir="ltr"><div dir="ltr">On Tue, May 18, 2021 at 8:56 PM brad <<a href="mailto:bradhaack@fastmail.com">bradhaack@fastmail.com</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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I think the fundamental problem is that we have too many tags for a
functional classification scheme.<br></div></blockquote><div><br></div><div>I don't find this to be the case. Adam Franco and I have been discussing highway classification for our state of Vermont and our current ideas are something along these lines:</div><div><ul><li><b>Motorway:</b> Interstate highways</li><li><b>Trunk:</b> The most important US and VT highways</li><li><b>Primary:</b> The rest of the US highways, medium importance VT highways, the most important town roads</li><li><b>Secondary:</b> Low importance VT highways, high importance town roads</li><li><b>Tertiary: </b> Medium importance town roads</li><li><b>Unclassified:</b> Low importance town through roads</li><li><b>Residential:</b> The least important residential roads</li></ul></div><div>There is some discussion over whether residential should be considered less important than unclassified, or whether they are at the same level of importance, but either way it does not feel like we have a problem of too many tags. The problem is that US highways are not universally more important than state highways and the importance of each can vary greatly depending on the route. <br></div><div><br></div><div>What I can say from studying UK road classification and how it maps to OSM is that most of our US and state highways fill the space in the road network intended for Trunk, Primary, and Secondary (some qualify for Motorway). So basically the only way to get a sensible small scale map in the US is to do something like this: <br></div><ol><li>Consider the network of all US and State numbered routes <i>primary </i>to start</li><li>Upgrade the most important routes to <i>trunk</i></li><li>Downgrade less important routes to <i>secondary</i></li></ol><div> It would be nice if the government did this work for us so we could just look at the sign for a route and classify it accordingly (as they can in the UK), but it's just not the case. <br></div><div><br></div></div></div>