I work for Mapbox.  We have some teams dedicated to improving OSM.  A lot of our product stack is built on the OSM data set, so we have a vested interest in improving it wherever we can.  We do a whole bunch of analysis to try to identify areas with errors and shortcomings.<p>We built and use this tool:<p><pre><code>    http:&#x2F;&#x2F;osmlab.github.io&#x2F;to-fix&#x2F;
</code></pre>
to queue up stuff that needs fixing, and we have people churning through it all the time.<p>There are some really cool things in mapping tech.  For example, Strava has made available a whole dump of point data that can be used to look for un-labelled trails and roads (see the &quot;Strava&quot; layer in to-fix).