I mean, look, obviously I think that mass transit makes for better cities, and I believe that mass transit pretty quantifiably moves more people in smaller space than cars do.
But, I also do understand why it seems intuitive and obvious to some people that "removing lanes will just make congestion worse, because you have less space for [the same number of] cars". If you buy a small house, but then have 3 kids and adopt a dog, you need a bigger house so everyone has enough room -- it's a line of thinking that feels like "common sense".
I think the parenthetical in my hypothetical quote above is key: "for the same number of cars". One of the arguments in favor of reallocating public ROWs from private auto use to public mass transit use is that better mass transit gets people out of their cars,
reducing the number of cars overall.
In the case of Blue Hill Ave, this rests on a tacit assumption: that some number of people driving on BHA would take transit if it were better -- that the bus lanes will move people out of cars. And there surely must be
some people who fall into that category... but is it a lot?
There still definitely are other reasons in favor of reallocating space in the public ROW to mass transit (and to cyclists, and to pedestrians), don't get me wrong! But I definitely can understand the skepticism.
I've given this example before, but take UMass Boston, putatively a "commuter school", a stone's throw from Dorchester. Coming from the Mount Bowdoin neighborhood, 1.6 miles as the crow flies, it's a 13 minute drive (during the evening rush hour!). But by transit, it's 32 minutes, if you are willing to walk 15 minutes to the Red Line, or
39 minutes via a minimal-walking-two-bus journey.
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Obviously this is just one example, and there are certainly many commutes that will be faster by transit than by car. But it's not like UMass Boston is an obscure destination; if a journey like this is so extraordinarily uncompetitive by car, then it's easy to imagine why people would feel confident that the overall number of cars isn't gonna decrease.
I don't have any great solutions for this. I just think it's important to approach these conversations with as much empathy as possible.