The number of UberX drivers registered in New York City has more than doubled since last fall, from just shy of 10,000 in September 2014, to more than 20,000 this September. (UberX drivers operate black cars, so these numbers do not include Taxi drivers who use the Uber platform.)

Uber's latest statistics recall the so-called Uber "flood" that Mayor de Blasio warned against over the summer.

"Our goal is to ensure that our streets aren't flooded with tens of thousands more cars before we can stand up new rules to govern the marketplace," he wrote in a July editorial, adding that, unregulated, Uber would increase competition between drivers. The mayor also warned against more traffic, more carbon emissions, and more vehicles without mandatory wheelchair accessibility.

A few weeks later, de Blasio conceded to a congestion study of the startup's impact on traffic and the environment without imposing a temporary growth cap.

The scrapped cap, sponsored by Brooklyn Councilmember Stephen Levin and endorsed by the TLC and DOT, would have limited Uber's growth to just 200 drivers over 14 months.

Uber spokesman Matt Wing tells us that the NYC fleet's growth has been steady over the past 12 months, and that drivers are being added to the platform to keep up with an increase in demand from app-happy New Yorkers. This summer, at the height of Uber's PR battle with Mayor de Blasio, the company stated that it added between 20-25,000 new NYC riders to its platform each week. This month, Wing confirmed, that number has jumped to 30,000.

Thanks to the increase in ridership, Uber says that gross fares per hour have increased an average of 6.4% this year, from $39.96 to $39.30. According to a recent Uber blogpost, "Having more drivers and riders on the system means that drivers are typically closer to a pickup at any given moment. Eliminating wait time between trips makes for higher hourly earning potential."

Uber has 2.5 million NYC riders as of last count, taking 1 million trips per week (80% of which are non-taxi UberX trips). In the meantime, yellow cab pickups dropped 10% in the first half of 2015, and a taxi graveyard grows in Greenpoint.

"We are proud that New York City drivers-partners are earning more than ever per hour and can't wait to see these numbers continue to rise," said Uber NYC GM Josh Mohrer in a statement.

Asked if the doubling of Uber's fleet had raised concerns about the viability of an accurate congestion study, Mayoral spokesman Wiley Norvell issued the following statement:

We intend to put forward a regulatory framework that responds to the changes we’ve seen in this sector and ensures fundamental needs like accessibility, support for public transit, congestion management and protections for drivers and consumers are all addressed.

Late last month, two Uber drivers filed a lawsuit against their employer in Brooklyn Supreme Court, alleging that the company withheld their rightful tips by abruptly decreasing their fare shares from 75% to 72%, and forced them to pay for their own gas and car repairs.

"With Uber there is no need to tip,” an Uber spokeswoman stated in response to these claims. "Once you arrive at your destination, your fare is automatically charged to your credit card on file."