After five years of prep, New York to charge drivers $15 to enter Lower Manhattan. There’s no such plan for Boston.

But, the long-discussed idea of congestion pricing in Boston remains just that: an idea. Even suggesting taxing drivers can get some politicians in hot water. Congestion pricing, experts say, is a tool that can help jump-start a change in how people travel by slashing traffic and climate change-causing fumes. The idea has been studied repeatedly by state and regional organizations in Massachusetts and discussed by lawmakers for years. New York City is expected to make history next month as the first US city to implement a kind of congestion pricing....