Previously they ran their own stack based on OSM data, but they&#x27;re now moving to use Mapbox&#x27;s stack (which of course is also founded on OSM):<p><a href="https:&#x2F;&#x2F;www.mapbox.com&#x2F;blog&#x2F;mapquest&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.mapbox.com&#x2F;blog&#x2F;mapquest&#x2F;</a>