I noticed the following suggested definitions for California for different road
classes:
http://wiki.openstreetmap.org/index.php/California
For tertiary, they suggested
highway=tertiary
Lower traffic volumes on wide streets, or higher on narrow ones.
Kinda' vague and I'm not sure
Here's an example, where I used to live a short distance south of Alviso:
http://www.openstreetmap.com/?lat=37.3851lon=-121.9258zoom=14layers=B000FTF
See the light yellow roads that connect to other roads such as
Montague Expressway and 1st St? Roads such as Lick Mill Blvd, Orchard Parkway,
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