New York City’s congestion pricing is the first of its kind in the United States. Yet congestion pricing has been implemented in cities across the globe for decades, including in Singapore since the 1970s, London since 2003 and Stockholm since 2007 .

The first congestion pricing plan in the U.S. has begun, charging most drivers $9 a day to enter the lower half of Manhattan. The long-debated plan is projected to raise up to $800 million a year for the city's aging public transit system.

Manhattan commuters are already marveling at what appears to be less traffic — and grousing about the new $9 tolls.

While commercial trucks entering Manhattan will be charged depending on the truck size and time of day, there are workarounds.

The countdown to congestion pricing in New York City is over. Drivers now must pay a toll to enter Manhattan south of 60th Street.

The program had defied many obstacles over the course of decades. It debuted over the weekend on what seemed to be a successful first day.

Explore NYC's congestion pricing initiative aimed at reducing traffic congestion and enhancing urban air quality for a greener city.

Monday marked the first weekday that thousands of drivers in New York paid congestion price fees when entering parts of Manhattan. Passenger vehicles will now pay as much as $9 to drive past 60th Street during peak hours.

President-elect Donald Trump has vowed to help end the new congestion pricing plan in New York City. He made the comments to supporters during a meeting with Republican members of New York's House delegation Saturday.