Sometime in the last couple of weeks, the city replaced all of the street signs on Beacon Avenue South with the new and bigger signs that are gradually being installed throughout the city. The new ones are much easier to read from a distance, and on dark and rainy nights; they are really reflective and glow brightly in a car’s headlights. The font has changed as well. (The new one appears to be FHWA Series C, as far as I can tell. You can get a version of that font here.)
The sign replacement program is now planned to run through 2016, and the old signs are being sold to the public. You can see more of the old street signs here — and, of course, there’s one in the header graphic of this page.