New York’s new tax on drivers entering the center of Manhattan debuted Sunday, meaning many people will pay an additional $9 to access the busiest part of the Big Apple during peak hours.

The tax, described as a “congestion pricing” toll by city officials, is ostensibly aimed at reducing traffic gridlock in the densely packed city while also raising money to help fix its ailing public transit infrastructure.

“We’ve been studying this issue for five years. And it only takes about five minutes if you’re in midtown Manhattan to see that New York has a real traffic problem,” Metropolitan Transportation Authority Chair and CEO Janno Lieber told reporters late Friday after a court hearing that cleared the way for the tolls.

The cost to drivers depends on what time of the day it is and if drivers have an E-ZPass, an electronic toll collection system that’s used in many states.

Most drivers with E-ZPasses will get dinged the $9 fee to enter Manhattan south of Central Park on weekdays between 5 a.m. and 9 p.m. and on weekends between 9 a.m. and 9 p.m. During off hours, the toll will be $2.25.

That’s on top of the toll of as much as $15 drivers pay for crossing various bridges and tunnels to get to the city in the first place, although there will be a credit of up to $3 for those who have already paid to enter Manhattan via certain tunnels during peak hours.

President-elect Trump has vowed to kill the program when he takes office, but it’s unclear if he will follow through. The plan had stalled during his first term while it waited on a federal environmental review.

In November, Trump, whose namesake Trump Tower is in the toll zone, said congestion pricing “will put New York City at a disadvantage over competing cities and states, and businesses will flee.”

“Not only is this a massive tax to people coming in, it is extremely inconvenient from both driving and personal booking keeping standards,” he said in a statement. “It will be virtually impossible for New York City to come back as long as the congestion tax is in effect.”

Other big cities around the world, including London and Stockholm, have similar congestion pricing schemes, but New York’s is the first in the United States.

The toll was supposed to go into effect last year with a $15 charge, but Governor Hochul abruptly paused the program before the 2024 election, when congressional races in suburban areas around the city — the epicenter of opposition to the program — were considered to be vital to her party’s effort to retake control of Congress.

Not long after the election, Ms. Hochul abruptly reversed her decision but at the lower $9 toll. She denies politics were at play and said she thought the original $15 charge was too much, though she had been a vocal supporter of the program before halting it.

Congestion pricing also survived several lawsuits seeking to block the program, including a last-ditch effort from the state of New Jersey to have a judge put up a temporary roadblock against it. A spokeswoman for the New Jersey governor, Phil Murphy, said in an email Saturday, that the state would “continue fighting against this unfair and unpopular scheme.”