Last month,  Telenav’s team announced the release of the Missing Roads plugin and the web tool designed to show the roads that are not present in OSM, based on our collected global GPS data from the millions of Scout & Scout SDK users. As this tool gathered very quickly the attention of a few mappers, we already have > 20% of all the Missing Road tiles resolved.


Now again, we are exposing a new tool to the OSM community: a tool targeted towards fixing the missing or wrong one-way restrictions..

The web tool can be found at and the JOSM plugin in the JOSM plugin repository (accessible via the JOSM preferences menu).  The source code for the plugin is available on Github and we’ve also started building the plugin’s wiki page (at the time of writing this post there is still some work to do on the wiki page, but soon we’ll have everything in place).


In the next part of the post, we’re sharing the original post of our colleague, Martijn van Exel’s from his OpenStreetMap diary. Enjoy his story and enjoy the tool:

“For the darker and colder November days — well, if you are on the Northern hemisphere at least — we thought we would cook up something new to keep us all busy.

We ran another analysis on our GPS data to uncover ways that probably do not have the right directionality. Either they should be oneway=yes and they are not, or they are oneway=yes but in the wrong direction.


Here is an example from Karlsruhe, Germany:

Screenshot 2015-10-28 23.26.11


The orange arrow points in the direction we think traffic on that street flows based on what we know from our Scout GPS data.

The way we do this is by looking at the directionality of the GPS tracks. If more than, say, 90% of all tracks matched to an OSM way go in a single direction, it is pretty safe to assume that it is a one-way street. We then compare that to how the way is mapped in OSM. If there is no correct oneway tag on the way, you will see the way in this tool.

Let’s open the earlier example up in JOSM:



This looks a bit cluttered because there is so much OSM data, but if we zoom in a bit and make the OSM data layer invisible for a moment, we can see from the direction the cars are parked and the arrows on the road that this is indeed a one-way street:


*Aerial imagery in JOSM from Bing


We found more than 140.000 (!) of these cases all over the world waiting for us to fix them. This works almost exactly the same as in our Missing Roads plugin and web tool we released last month. You can look at the Missing Roads manual (I will write a proper manual for the One-way plugin and tool soon).”


@mvexel  & Telenav’s  team: keep up the good work and happy mapping!