Here's what's really going on with this newest development.
Transport for London (TfL) announced in a shock ruling on Friday that it would not be renewing the ride-hailing app's operating licence, which is due to expire at the end of the month. Without it, Uber can not legally operate in the city.
In a statement addressing the petition, Khan said: "I know that Uber has become a popular service for many Londoners - but it would be wrong for TfL to license Uber if there was any way this could pose a threat to Londoners' safety or security". The transport authority cited reasons such as approach to report serious driver offences, health checkups, and other safety issues.
It's approach to how medical certificates are obtained.
They also faced criticism for failing to obtain thorough criminal record checks for their drivers.
Sydney has certainly embraced Uber, with over one million current customers (well, current app users - you aren't all in Ubers at the moment), and 20,000 drivers.
A Lyft spokeswoman declined to comment on the timing of any expansion moves or the nature of Lyft meetings with London officials. "Even though there is a legal process in place, I have asked TfL to make themselves available to meet with him", said Khan.
By 2200 GMT Saturday, more than 600,000 people had signed although it was not clear how many of them were in London.
Why is Uber so controversial? The company said its drivers have been "through the same enhanced background checks as black cab drivers". Mayor Kahn's political opponents have been quick to point out that he received £30,000 from the union during his campaign to be London Mayor.
In monuments report, a skewed view of protections
Paul Cook, R-Yucca Valley, had asked the Trump administration to shrink the boundaries of the San Gabriel Mountains monument . And Cascade-Siskiyou, an 86,000-acre monument in OR that was established by Clinton and doubled in size by Obama in January.
A letter from the PMs to TfL claimed Uber allowed rape and sexual assault cases to develop and accused the company of paying its drivers as little as two pounds an hour.
Transport for London has the mayor's support.
Kajal Odedra, UK director at Change.org, said it was "the fastest growing petition we've seen in the UK this year".
It is not the first time that Uber faces something like this since the service has been suspended or banned from other cities in the past.
Whatever my personal travel preferences, Uber clearly has important issues to deal with.
The new rules also change the requirement for in-vehicle cameras - there is an exemption for services provided only to registered passengers who provide their details in advance.
While Khosrowshahi has adopted a more contrite tone than his predecessor, Uber hasn't abandoned the grassroots lobbying tactics that has helped Uber win favorable treatment from regulators around the world.
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