Alphabet has led a $1bn investment in ride-hailing app Lyft, even though it's also an investor in its rival Uber.
The massive fundraising comes from the tech giant's growth investment fund CapitalG and the fresh cash puts Lyft's valuation at $11bn. Google Ventures was an early backer of Uber.
Lyft has been handed a boost as a result of Uber's annus horribilis and is reportedly exploring expansion plans outside the US for the first time.
"2017 has been an important year for the Lyft community. Earlier this month, we completed our 500 millionth ride and our service is now available to 95 per cent of the US population - up from 54 per cent at the beginning of the year," the company said in a blog post.
"While we’ve made progress towards our vision, we’re most excited about what lies ahead. The fact remains that less than 0.5 per cent of miles travelled in the US happen on rideshare networks. This creates a huge opportunity to best serve our cities’ economic, environmental, and social futures."
It is also moving into driverless car technology, an area where Alphabet boasts one of the strongest pedigrees.
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CapitalG partner David Lawee will join the board of Lyft, which already raised $600m earlier this year at a $7.5bn valuation.