Starting just after midnight on Sunday, drivers began paying a new fee to enter the heart of Manhattan. The toll is part of New York City’s plan to reduce some of the world’s heaviest traffic while raising billions of dollars to pay for improvements to mass transit.

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.

New York City implements a congestion fee to reduce traffic and fund public transport, with a $9 charge during peak hours.