Road traffic – Private hire vehicle. The judge had erred in quashing a voice contact requirement on private hire vehicles operators in London, including Uber, given that it had been necessary and proportionate. The Court of Appeal, Civil Division, in allowing TfL's appeal, further held that the judge had failed to accord TfL, as regulator, a proper margin of appreciation, his emergency telephone alternative had not been a less restrictive alternative and the costs imposed on the operators as a result of compliance with voice contact requirement would not be disproportionate.