Looks like the city of Cambridge is putting Mt Auburn Street on a diet- a lane diet.
I don't feel bad about taking a lane when there are two lanes, but if it's down to one, it may become more uncomfortable.
They've progressed beyond these photos and ground out some of the old thermoplastic, but not put new paint/ thermoplastic down. Am looking forward to a bit more clarity when they get the new markings in- at the moment its a bit confusing. Although I think confusing isn't all bad- it slows people down as they have to actually think about where they're going!