With apologies to Ed Ruscha...
Look really closely at the top sign. See the bolt at the M of "EACH MONTH"? It says "SOMERVILLE" under there just inside the red margin. Ditto the no bikes sign - below the black border, SOMERVILLE.
Hmm. This sign is close to where I parked. It might say SOMERVILLE on the top sign like the one previous, but it's covered up by the lower sign, which has no city designation.
A split decision here. The street cleaning sign does say SOMERVILLE in small letters, but the permit parking sign says nothing.
This pair has no city on it. Are we in Cambridge yet? Probably not, since the street cleaning days match the Somerville signs.
This is definitely the largest type size for the word SOMERVILLE so far.
Aha! Pretty clear lettering by Cambridge, plus a different street cleaning zone.
CITY OF CAMBRIDGE. Can't miss that.
In sight of Mass Ave, if you weren't sure yet, you should be now.
The tally: Five signs in Somerville, about half of them saying Somerville, and six signs in Cambridge, all unambiguous. A pretty poor showing by Somerville since only about 1/4 to 1/3 of the length of the street is Cambridge. The facts aren't in doubt, but it took some squinting to find them.