Uber aims for stock market debut value of more than $90bn

Target valuation would be largest float for US tech company since Facebook in 2012

Uber has unveiled the terms of a hotly anticipated stock market float which it hopes will value the ride-hailing service at more than $91bn (70bn).

While the target is $10bn less than some bankers suggested the 10-year-old firm might be worth, the valuation is more than double the value of the 116-year-old carmaker Ford and would be the largest float by a US tech company since Facebook's in 2012.