The NYPD is stationing officers at Central Business District entry points with patrol cars looking for illegal or obstructed license plates.

For drivers, the $9 congestion pricing fee isn't the only expense that may be waiting as you enter the Central Business District. CBS News New York's Doug Williams tells us what you need to know to avoid getting a ticket,

With congestion pricing now in effect in NYC, officials are cracking down on obscured license plates, or "ghost plates," to avoid the toll.

Drivers have been paying a toll to travel into the congestion zone in Manhattan since Sunday. Police and the MTA have been making sure people pay. Three drivers were arrested for warrants or serious violations at an action Wednesday afternoon into the evening on the Whitestone Bridge.