While not likely to face its first stringent test until Monday morning rush hour, New York City's congestion pricing plan for drivers kicked off at midnight Sunday. Transportation leaders declare success amid pushback.

New York City kicked off the first congestion pricing program in the US, part of an effort to reduce the number of vehicles in the world’s most traffic-clogged urban area while raising money for transit infrastructure.

New York City's controversial congestion pricing plan begins today. Here's what you need to know about how it works, who it affects and what it will cost.