Uber to buy 24,000 Volvo cars for driverless fleet

“In a self-driving world there is no human, so you need redundant steering and braking and actuation systems, such that if there is an electrical or mechanical failure, the back-up system can kick in,” said Jeff Miller, Uber’s head of automotive partnerships. He added that the figure of 24,000 was a “best guess” of how many cars Uber would need initially, with a “lot of variability” given regulations and the growth of Uber’s business.