New Jersey asked a federal judge to block New York from moving forward this weekend with a plan to charge drivers entering Manhattan’s central business district while a legal challenge plays out.

Singapore has it, London has it, Stockholm has it. And now, congestion pricing looks like it’s coming to the United States for the first time. Starting Sunday, New York City plans to charge passenger cars, trucks and buses to drive into midtown and lower Manhattan during peak hours, beyond bridge or tunnel tolls.

A dizzying array of exemptions, credits and existing tolls makes it tricky to calculate how much drivers will actually pay when they enter Manhattan south of 60th Street.