An illustration picture shows the logo of car-sharing service app Uber on a smartphone next to the picture of an official German taxi sign in Frankfurt, September 15, 2014. A Frankfurt high court will hold a hearing on a recent lawsuit brought against Uberpop by Taxi Deutschland on Tuesday. San Francisco-based Uber, which allows users to summon taxi-like services on their smartphones, offers two main services, Uber, its classic low-cost, limousine pick-up service, and Uberpop, a newer ride-sharing service, which connects private drivers to passengers - an established practice in Germany that nonetheless operates in a legal grey area of rules governing commercial transportation. The company has faced regulatory scrutiny and court injunctions from its early days, even as it has expanded rapidly into roughly 150 cities around the world. REUTERS/Kai Pfaffenbach (GERMANY - Tags: BUSINESS EMPLOYMENT CRIME LAW TRANSPORT)