Istanbul Public Transit Authority (IETT) Buses IETT's fleet of 2,500 buses encompasses 545 lines and tends to be extremely crowded. Buses run daily from about 6:30 AM to 11:30 PM. Each IETT trip costs TRY 2 per passenger. Tickets must be purchased at the system's numerous white kiosks, found at major stops, before boarding the bus.Tram SystemIstanbul's tram system offers three modern lines and one historic line. The modern lines include the T1 Zeytinburnu-Kabatas line, T3 Zeytinburnu-Bagcilar line and T4 Edimekapi-Sultanciftligi line. The most popular tram line is the T1, which travels along the Sea of Marmara past the Grand Bazaar to Sultanahmet, then across the Galata Bridge to Taksim Square. The 19th centur…