https://www.boston.com/cars/local-news/2019/08/14/managed-lanes-massachusetts-traffic
"The new lanes allowed the highway to carry 23 percent more cars, while increasing the average speeds by up to 27 mph for those who paid the toll and by 6 mph for those who stayed in the general lanes. And in their first three years, the toll lanes generated nearly $75 million in revenue to be reinvested in the corridor. Bus ridership on I-405 also increased by 5 percent."
The weakness in the "managed lanes" concept is that you have to add lanes otherwise you are cold turkey reducing existing capacity converting existing lanes which will never fly.
And the highways that would benefit most would be the ones that are physically constrained for expansion going into and out of the city. Even rt 128 doesn't seem like it would be politically feasible to add 2 to 4 lanes for any great length.
The rt 93 reversible contraflow "zipper" lane would seem to be the only model that would work where you sacrifice a lane in opposite direction during peak times. And I think that could only work potentially on the Mass pike and rt 93 north. As it already exists on the Southeast expressway it is difficult to see how making this a toll lane now will do anything but increase traffic in the non-toll lanes. Which makes running an experiment difficult.
I am warming to congestion pricing, but I think the risk of reinforcing/rewarding the state with higher revenue as service is degraded is very real. Things could just continue to get worse and additional monies wasted. And it is hard to envision a practical and politically acceptable alternative that would actually improve congestion rather than merely raise revenue.
A reservation system with hard limits (say up to 90% capacity, with larger fees for some percentage that don't have advance reservations say 5%) on cars allowed in particular areas could be effective at keeping traffic below the critical thresholds for gridlock.
I think it would be hard to sell, but perhaps a reservation system with congestion pricing up to 95% and $30 fines for cars above the threshold could be rolled out in downtown areas on local roads where there is the greatest congestion first. Seaport, Airport, certain zones in Downtown Boston come to mind. There the biggest political difficulty is the residents who would have to be either given free reservations or have a great discount on reservations and make local residents first in line to make it politically viable.