At the end of October Telenav released a tool to help identify incorrectly tagged, or missing, one way streets in OpenStreetMap. The tool makes use of the data they collect through their Scout Navigation app and compares this against OpenStreetMap data. If the scout data shows that drivers only travel in one direction down a street it the tool checks for a corresponding oneway=yes tag in OpenStreetMap. If it doesn’t find it then it flags up a potential error.
The potential errors can be viewed at the Improve OSM website, but the best way to use it is with the “trafficFlowDirection” plugin for the JOSM map editor:
- Download the “trafficFlowDirection” plugin for JOSM.
- After restarting JOSM add the Bing background via the Imagery menu. The Traffic Flow Direction layer should add itself to the list of visible layers automatically.
- Zoom to a potential oneway error as identified by the orange circles (when zoomed out) and the orange arrows (when zoomed in).
- Download and fix the OpenStreetMap data if appropriate.
- So others know the error has been fixed (or marked as invalid if appropriate) mark the issue as Closed (or Invalid). Do this by first making the TrafficFlowDirection layer active and selecting the issue you just solved:
Then click the green lock in the plugin panel, add a comment, and close the issue.
- Don’t forget to upload the improved OpenStreetMap data when you have finished.
Full instructions can be found here.