If Boston decided to set up a congestion zone, where would we put the boundaries? Boston could easily borrow from the successful models of both Stockholm and London. Stockholm is a city of islands, so it only needs camera gantries along bridges crossing its waterways. On its north side, Boston could replicate Stockholm by placing toll sensors on bridges over the Charles River from Cambridge, Charlestown, and East Boston.
The situation in Boston becomes more complicated to the west and the south, where drivers have myriad land entry points, such as along Soldiers Field Road, Commonwealth Avenue, Route 9, Columbus Avenue, Blue Hill Avenue, or Massachusetts Avenue.