For some reason I'm a little too excited about the fact that our base is made out of I-93. I was getting worried that there might be a bridge out there missing a cross beam or two, but we noticed today that there's an exit number on here.
According to Wikipedia, Exit 22 is the old Chinatown exit, now, post-big dig, named exit 20. As we all know, the big dig was largely funded by federal taxpayers, and it is clear that the big dig paid for this beam's removal. The way I see it, this art project is the west coast's cut of the big dig action.