I’m currently updating Sardinia street names, using open data (IODL) from Regione Sardegna.

The best data source is the Geo Topographic Database (http://www.sardegnageoportale.it/index.php?xsl=1598&s=269925&v=2&c=8831&t=1) . It covers 125 towns out of 377. The data is pretty accurate.

As a secondary data source I’m using DBT Elemento stradale (http://webgis2.regione.sardegna.it/download/). It covers all the towns, but is older and many street names are missing.

I’m updating the names of existing OSM highways. For missing roads I’m using Mapbox Satellite first.