The NoName map layer used to be available on the openstreetmap.org front page as an alternative layer. It highlighted roads which had no name=* tag (At the time these tended to be those roads which had been traced in from imagery through armchair mapping, rather than having been surveyed at all)
No longer available - Alternatives
The NoName layer is no longer available, however there are other tools which highlight missing names on a map
- OSM Inspector, with the 'Highways' view.
- Yet another validation tool for osm data
- Qa.poole.ch (QA tool)