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NEW YORK - NOVEMBER 26: Jimmie Johnson (R), the 2007 NASCAR NEXTEL Cup Series Champion, tours the New York Stock Exchange with his wife Chandra Johnson (C) and NYSE Euronext Chief Financial Officer Nelson Chai November 26, 2007 in New York City. (Photo by Chris Trotman/Getty Images For NASCAR)

NEW YORK - NOVEMBER 26: Jimmie Johnson (R), the 2007 NASCAR NEXTEL Cup Series Champion, tours the New York Stock Exchange with his wife Chandra Johnson (C) and NYSE Euronext Chief Financial Officer Nelson Chai November 26, 2007 in New York City.  (Photo by Chris Trotman/Getty Images For NASCAR)

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Sign with logo at the headquarters of ride-sharing technology company Uber in the South of Market (SoMa) neighborhood of San Francisco, California, October 13, 2017. SoMa is known for having one of the highest concentrations of technology companies and startups of any region worldwide. (Photo by Smith Collection/Gado/Getty Images)

Sign with logo at the headquarters of ride-sharing technology company Uber in the South of Market (SoMa) neighborhood of San Francisco, California, October 13, 2017. SoMa is known for having one of the highest concentrations of technology companies and startups of any region worldwide. (Photo by Smith Collection/Gado/Getty Images)

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A sign is displayed at an Uber Technologies Inc. office during a driver recruitment event in Hong Kong, China, on Tuesday, Dec. 29, 2015. Uber is in the process of further padding its war chest with as much as $2.1 billion in a financing round valuing the company at $62.5 billion, people familiar with the matter said this month. Photographer: Justin Chin/Bloomberg via Getty Images

A sign is displayed at an Uber Technologies Inc. office during a driver recruitment event in Hong Kong, China, on Tuesday, Dec. 29, 2015. Uber is in the process of further padding its war chest with as much as $2.1 billion in a financing round valuing the company at $62.5 billion, people familiar with the matter said this month. Photographer: Justin Chin/Bloomberg via Getty Images

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Pedestrians walk past the Uber Technologies Inc. headquarters building in San Francisco, California, U.S., on Wednesday, June 21, 2017. Travis Kalanick has resigned from his job leading Uber Technologies Inc., giving up his effort to hold onto power as a torrent of self-inflicted scandals enveloped him and the global ride-hailing leviathan he co-founded. Photographer: David Paul Morris/Bloomberg via Getty Images

Pedestrians walk past the Uber Technologies Inc. headquarters building in San Francisco, California, U.S., on Wednesday, June 21, 2017. Travis Kalanick has resigned from his job leading Uber Technologies Inc., giving up his effort to hold onto power as a torrent of self-inflicted scandals enveloped him and the global ride-hailing leviathan he co-founded. Photographer: David Paul Morris/Bloomberg via Getty Images

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HONG KONG, HONG KONG - AUGUST 31: The startup screen of Uber, car transportation mobile app developed by the American technology company Uber Technologies Inc, pictured on the display of an iphone 6s plus, on 31 August 2017 in Hong Kong, Hong Kong. (Photo by studioEAST/Getty Images)

HONG KONG, HONG KONG - AUGUST 31: The startup screen of Uber, car transportation mobile app developed by the American technology company Uber Technologies Inc, pictured on the display of an iphone 6s plus, on 31 August 2017 in Hong Kong, Hong Kong. (Photo by studioEAST/Getty Images)