I got an E-mail back from the city about the bike box I mentioned in my previous post. It was actually striped by a contractor for the adjacent Triangle property redevelopment and was done as part of that redevelopment. City staff felt a bike box here was justified due to the large number of bicyclists, the signal cycle, and what the city perceives as difficulty for bicyclists making the left turn from SB Commonwealth to SB Mt. Vernon. The city will monitor its use and looks forward to input from users.
Right now the city budget is tight, but they are considering adding bike boxes at other locations...I couldn't get a specific list of intersections being considered, though, but I'll keep trying.