The ride-sharing firm Uber will, for the first time, allow users to hail self-driving cars later this month, it has been reported. According to Bloomberg Businessweek, Uber’s chief executive Travis Kalanick said the launch would take place in Pittsburgh, in Pennsylvania. At first, the vehicles will be supervised by a driver, who can take control if necessary, and an observer. Uber eventually hopes to replace its one million drivers, Bloomberg said. Customers in Pittsburgh will…