Facing stiff competition from rivals in Istanbul، taxi hailing app Uber will offer free rides in the Turkish city on Sunday for voters taking part in the hotly contested referendum، Reuters reported. Turks will vote on whether to grant President Tayyip Erdogan sweeping powers and bring about one of the biggest changes in the country's system of governance since the modern republic was founded almost a century ago. "Uber will take everyone to the ballot boxes for free in the referendum being held on April 16،" the company said in a statement. The offer only applies in Istanbul -- a city of 15 million people -- and is limited to two journeys worth up to 30 Turkish lira ($8.07) each on the uberXL service، referring to larger vehicles that hold up to six people. Uber launched in Istanbul in 2014 and has faced competition from a popular home-grown taxi app، Bitaksi. It has previously offered a boat service aiming to capitalize on Istanbul's infamous road congestion.