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To make this an answer for others: Here those roads are called Frontage Roads. So the road that runs along side I-35 is simply I-35 NB Frontage for the northbound, SB for the southbound. I am not sure if that is a universal naming method or not. Since you are using a road network you will need to give the roads proper classification and possibly ...


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There is an experimental QGIS plugin (you need to mark "Show also experimental plugins" in Plugins|Settings) named PointsToPaths that converts points to lines with verticies grouped by a text or integer field and ordered by an integer or date string field. You can try out it.


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Instead of tracing you could try this Polygon to Centerline tool: http://www.arcgis.com/home/item.html?id=bc642731870740aabf48134f90aa6165 I have heard some people have had problems with it and others have gotten it to work just fine but it might be worth a shot and save you a lot of time instead of tracing. There is also a tool called Collapse Polyline ...


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Thanks for your advice. However, the lines must run along existing roads (marking the buses lines) and this is my main problem. Using these plug-ins I combine points with stright lines.


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You can also try Points2One plugin. It converts points to lines.



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