It looks like the MPO is using “congestion pricing” to mean “variable tolling on highways” like they do on interstates in Virginia and Texas , rather than a “charge to enter the central business district” like in London or Stockholm. Their map only included interstates and certain state highways, and notable excludes Storrow and Memorial Drives, so most trips from inner ring suburbs like Belmont and Watertown and Newton to Downtown or Kendall Square would not be affected by their version of congestion pricing. The central business district charge would probably yield more revenue that just the highways, but probably not to the level of NYC