^ Our standard practice for state routes is not to include unsigned routes, or disconnected route segments, even if they're state-maintained and legislatively-defined. That's why the Pasadena stub of route 710 is omitted. Ditto routes 222, 225, 244, and 259 (that last might change, as discussed above, in view of new signage), and some others. Unsigned Interstates, like I-305 in Sacramento, are OK per the webmaster for the predecessor site to TM (who decided that unsigned Interstates should be on the site, but not unsigned state routes).
Our treatment of unsigned routes is a subject of much discussion on this forum, and some heartburn such as with the saga of CA 259.
BTW, the legislative definition of route 710 extends (S&H Code section 622.1) south past route 1 to route 47. Our site includes route 710 south of route 1, initially to Ocean Blvd. in Long Beach and later (upon opening of the state-maintained replacement for the being-demolished Gerald Desmond Bridge) to CA 47 on Terminal Island.