The first congestion pricing program in the United States is taking final shape in New York City, and most drivers appear likely to pay $15 to enter some of the busiest streets in Manhattan as soon as next spring.

Transit officials on Wednesday provided the clearest picture yet of the tolls they hope to implement. They aim to collect roughly $1 billion annually to fund improvements to the city’s subway and bus networks.

The program faces a few hurdles, including a final vote by transit leaders and a legal challenge from New Jersey officials. But after various failed attempts over decades, New York seems poised to join a handful of other global centers with a toll program that aims to encourage the use of public transit, reduce pollution and unclog some of the world’s most traffic-choked streets — roughly the southern third of Manhattan.

In a 19-page report, transit officials said cars would pay a toll of up to $15 once per day, and commercial trucks would pay as much as $36. Taxis will add $1.25 per fare and ride-hail apps like Uber and Lyft will tack on an extra $2.50 per ride.

The report also showed who will get the biggest discounts, credits and exemptions, which have been hotly debated questions. The recommendations were narrowed down from a list of possibilities that had been studied over the past year.

“It’s a huge step forward for the region,” said Carl Weisbrod, the chairman of the Traffic Mobility Review Board, an advisory panel that wrote the report. “We’ve seen it work elsewhere around the world and now it is becoming concrete.”