Who will pay?

The drivers. Cyclists and skateboarders, while on wheels, will not be charged.

Who doesn’t want to pay?

The drivers. At least many of them. But as anyone who has taken Econ 101 knows, the fewer customers you have, the more you might need to charge them to reach your revenue goal.

[Who wants a break from congestion pricing? Practically everyone.]

What exemptions are planned?

Emergency vehicles.

Vehicles carrying disabled people. A statement from Governor Cuomo and Mayor de Blasio, who support congestion pricing, referred to vehicles “operated by or transporting people with disabilities and individuals who have an identifiable hardship or limited ability to access medical facilities” in the congestion zone.

Drivers who live in the congestion zone. They would not pay when they drive within the zone or when they leave it, but they would when they return. Residents in the zone who earn less than $60,000 a year could receive a tax credit.

Drivers using the West Side Highway and Franklin D. Roosevelt Drive to pass through Manhattan would not pay.

What exemptions are being sought?

New Jersey: A congressman there called for federal legislation to guarantee that drivers — who already pay tolls to cross between the states — are not charged twice.

About 115,000 people drive from New Jersey into Manhattan below 60th Street every weekday, according to the Metropolitan Transportation Council. That does not include an additional 150,000 people who drive the George Washington Bridge each day from New Jersey, many of whom are also destined for the congestion zone.

Asked about a New Jersey exemption, the M.T.A. chairman, Patrick J. Foye, said on Monday that if New Yorkers were paying the fee, “surely people from Missouri and Florida and Illinois and New Jersey should pay it.”

Police officers: In a recent op-ed in The Daily News, a union leader said the police should be exempted because “we require the greatest possible flexibility to get to work.”