First, traffic:
If you increase the capacity of a roadway, the traffic on it will expand to fill the available capacity. Individuals have a certain tolerance for using their time (waiting in traffic) to pay for "free" resources (like roads). If the "free" resource is tightly constrained, only the people willing to pay the most (i.e. wait the longest in traffic) will get the resource. There are literally millions of people within 20-30 miles of Boston who can and will clog the roads given enough capacity.
Fattony, this is true, but the scenario you are describing is different than the one that Charlestown is facing. As mentioned earlier, the idea is to add a dedicated bus lane through through Charlestown and into Haymarket This proposal still constrains traffic but speeds up traffic for public transportation only.
Second, please read my original post. The issue with the bus that runs through Charlestown is that they come relatively infrequently through the neighborhood, particularly the 93 which runs by the area affect. On the weekday, this is due to traffic which results in bus grouping/bunching. What's the point of running more buses when they end up grouping into caravans which comes every 20 minutes instead of what it is supposed to be, which is 7 minutes. A dedicated bus line would resolve this issue. On weekends, they come by every 20-40 minutes. Considering the area is made up of low income residents who DON'T work the typical 9-5 job, having to compete with thousands of new residents on a weekend for a bus that comes once or thrice every hour can a problem, especially if a bus is full and they have to wait another 20-40 minutes to get out of the town. A simple solution is the have the MBTA run additional buses. This is something that shouldn't be too hard to negotiate but one that needs to be done.
People can travel fast and comfortably on un-congested "free" roads until they approach the inner core and start "paying" by waiting in traffic. The price mechanism used to simultaneously satisfy supply and demand on roads is time spent sitting in traffic, but the pool of potential drivers is effectively infinite because un-congested roads are essentially free. Since our pool of potential drivers is infinite, a marginal increase to that pool is still infinite. The demand curve doesn't move just because you make a tiny % increase to the pool of potential drivers. That is why building more housing doesn't change the amount of traffic, although it may change WHO is in traffic. The people who are presently in traffic are actually scared that someone else will take their spot in traffic. The traffic doesn't actually get worse.
Again, nothing to do with the issue in Charlestown. Read my original post. Charlestown is an under-served neighborhood, public transit-wise. Sure, the new higher income residents have the option to drive or take public transit, however, the many of the existing low income residents don't. Their only option is to try to get on over-crowded buses. As a long-time ex residents of Charlestown, there were many cases, especially during the winter, where, I having to wait at the last few stops before it gets to downtown, had to wait for 3 buses before being able to get on a bus. Imagine having to compete with thousands of new residents that choose to not take their car into the city. The issue of traffic is that it exacerbates the problem by causing buses to bunch up. A bus dedicated lane + more frequent bus services would resolve the issue.
Second, regarding trains to nowhere:
Transit works similarly, but fundamentally differently from roads. Using transit also comes with a price in the form of time spent getting to transit and time spent on transit. Different from roads, however, the potential catchment of a transit stop ends a certain walking distance from the stop. There is no walking equivalent of the "free ride" offered by un-congested roads which connect distant homes to congested roads. You don't add potential riders by adding sidewalk capacity, haha.
To add potential transit riders, you have to build homes within walking distance of a stop - that is, homes near transit create new people with a low cost (in time) of using transit. If you build transit to an area with no population or low population density and very few people can walk to it, you've built transit only for people with a high cost of using it (a long walk). That is why building a train to nowhere is politically infeasible. You need homes and transit in conjunction for the transit to work. In contrast, the homes "work" on their own to the extent that people buy/rent them despite the lack of transit.
Politicians don't and probably shouldn't allocate millions or billions to projects that server no one (yet).
Methinks you have never been to Charlestown. There's a lot of residents in the neighborhood. This isn't some location like the Seaport that is being built from scratch. That being said, the MBTA decided to shift the Orange Line path (which used to run through Main Street), to where the highway is, serving only a miniscule portion of the residents in Charlestown and none of the area in question. That is because, while relatively close, Charlestown is divided by a hill that runs through the middle of the town, making it more difficult for residents in this part of the town to reach Community College/Sullivan Square station.
I think Rover is right here. There are fundamental difference between road traffic and transit and there are fundamental reasons that we don't see transit precede development.
This is incorrect. Again, look at the example of Assembly Station. Prior to the announcement that the Orange Line was looking to add a station here, there were no residents at Assembly Row. The location had a mall, a movie theater, Circuit City, Home Deport, and Good Times Arcade. The area was served by two buses, the 90 and 92, and rather infrequently. The addition of the Assembly Station, spurred the development, as it was built in conjunction with Assembly Row. The same needs to be applied here, especially since Charlestown is significantly larger than Assembly Row.