OSM extract for motorways in Alpes-Maritimes using Overpass API. Can be used from http://overpass.osm.rambler.ru/query_form.html

FR-Alpes-maritimes-motorway.xml

<!-- Can be used at http://overpass.osm.rambler.ru/query_form.html to download the corresponding .osm file --> 
<!-- Alpes-Maritimes relation is 7385. An area based on a relation has the id of the relation plus 3,600,000,000. -->
<area-query ref="3600007385" />
<!-- Get all ways from the resulting nodes -->
<recurse type="node-way"/>
<union>
   <!-- Get only ways tagged with 'motorway' -->
   <query type="way">
      <item/>
      <has-kv k="highway" v="motorway"/>
   </query>
   <!-- And get their nodes too -->
   <recurse type="way-node"/>
</union>
<print/>