Currently, parking with an obstructed license plate can lead to a $50 fine. The Metropolitan Transportation Authority this week began collecting new congestion tolls on drivers who enter south of 60th Street in Manhattan. But the authority runs the risk of missing out on toll revenue to scammers who alter or hide their plates.

New York City has become the first U.S. city to introduce congestion pricing, which is expected to ease traffic and raise $15B to fund major upgrades in public transit, after years of delays and widespread opposition - including from president-elect Donald Trump.