Uber, whose smartphone app summons rides at the touch of a button, won a new lease of life in the German city of Hamburg on Friday when a court suspended a ban imposed by local regulators. Hamburg traffic authorities told Uber earlier this week to stop operating in the northern port city on the grounds that its drivers lacked passenger transport licenses, one of a number of challenges to the San Francisco-based company from regulators and traditional taxi services across the globe. Uber retaliated with a complaint against the ban and a Hamburg court on Friday allowed it to continue operations while the court deliberates on the merits of the case. Uber said in a statement on Friday it welcomed the courts decision.