Bike lanes are
vastly more efficient at transporting people in cities than vehicle lanes, so
person-throughput (not car-throughput) will be increased by adding bike lanes.
That's really not true in this case; this is not a situation where we're talking about local, intercity transportation; to suggest that traffic on the 1/4-mile-long Charles River Dam Road, which is used mainly to connect to major arteries in and out of the city, is going to get better by adding a bike lane is not rational. I am 100% behind the change here, but as with so many things these days, there's a lot of bad evidence and irrelevant data that gets thrown around. This is really important to pay attention to, because it drives away a lot of would-be converts, because it only makes them more cynical toward what they read. For example, the cited article states,
Recent monitoring data shows that central London segregated cycle lanes are moving five times more people per square metre than the main carriageway, with East West Cycle Superhighway seeing a more than 50 per cent increase the total mileage cycled.
This may be factually true, but it completely ignores the fact that London, like Boston, is a massive, interconnected metropolitan area; simply documenting how many bikes are moving along a very circumscribed length of space in no way takes into account larger scale transportation patterns or efficiency of movement on a broader scale. This article is a stub without any analysis at all. If we are to win people to the cause, we need to do it wisely, and thoroughly.
There are many reasons to support bike infrastructure. We have a crisis of social isolation and sedentary behavior in this country, leading to unprecedented levels of metabolic disease and mental health conditions. That should be reason enough. If it's not, then understand that this area is, whether you like it or not, used by bikes, and it's incredibly unsafe; it is necessary to do something, now, to protect them. You don't have to buy into the bike revolution culture to accept this fact.
The tones on this debate could, as usual, be moderated a bit. It doesn't have to be a war. And, if the city/people really care enough to sink the money in, they could build a cycle boardwalk over the water to connect Nashua Street Park to points north in the future.