Panama City offers transportation services through yellow taxis. Taxis do not use a meter to measure fares, instead using a zone system for fares that is published by the Autoridad de Transito y Transporte Terrestre, Panama's transit authority. Taxis used to be red. Taxi drivers that charge more than usual are not uncommon. Many also participate in InDriver and Cabify. Uber has been the subject of controversy, with many taxi drivers demanding its cessation of operations in Panama City. 