Dolmuş is a kind of shared taxi with specific fixed and extensive route and a specific fee. There are many Dolmuş routes in the city. One of the commonly used line is the Taksim – Kadıköy line, which is one of the few routes crossing the Bosphorus from both sides and the line is crowded almost in every hour of the day as it is way cheaper then taking a cab.
Source: icvb.org.tr