^Re: Arlington's proposed map. I would like the idea of including Storrow in the Congestion Charge Zone, but to justify it, politically, there would definitely need to be improved transit, i.e. Blue-Kenmore. There are a lot of car trips made via Storrow that can not be easily duplicated with transit.
You could probably put these residential areas outside the CBD boundary if they recoil from tolls and complain that they don't have great transit
- Brownstone Back Bay Proper
- Brick Built Beacon Hill & Flat
- North End
Once you've built the Red-Blue connector, I'd suspect that Beacon Hill would be ok being all-in
North End, would probably freak at being fenced off from tourists (not realizing that their real problem is parking). And I think they and Back Bay can essentially be give a "local option" (tolls & no congestion vs outside w/congestion)
Here's a true Business CBD boundary:
(haven't quite mastered ScribbleMaps, but you get the idea)
If somebody wants to drive into the city, do a loop around the Common or North End and drive home with no congestion charge, the system could probably tolerate that. Same goes for putting the Convention Center outside the boundary--people visit too rarely and transit is too lame to be really worth punishing auto trips as long as they stay out of Seaport Proper.
The real thing is taxing daily, habitual, work-peak trips by auto in business places with great transit. That's probably (technically) the inner boundary shown, but as fattony points out, it'd get a little hard to explain.