There's a US 210 trailblazer in Pasadena on eastbound California just before Orange Grove.
Somebody in Pasadena is certainly not paying attention! And I guess I haven't really paid attention to the "California 210" signs by Lowell Avenue, even though when I visit California, I often use Lowell to get from Tujunga, where my friend Joe lives, to get at the 210. I'm not the "sign geek" that some road fans are, and having grown up in La Canada, I'm familiar enough with the area that I don't need the signs to tell me how to get to the freeway, of course. So I just haven't paid attention.
Next time I'm in California, I'll have to remember to try to check out the "US 210" sign.