How to query for all highways in #OSM Overpass API (demo: overpass-turbo.eu/s/3sB):
<osm-script output="json">
<query type="way" into="highways">
<bbox-query {{bbox}}/>
<has-kv k="highway" />
</query>
<union>
<item set="highways"/>
<recurse from="highways" type="down"/>
</union>
<print mode="body" order="quadtile"/>
</osm-script>
This returns all highways without filtering, check out the OSM Highway docs for different possible types of highway, and add a v=""
attribute to the has-kv
element to filter.