What is bm4 iett?

BM4 is a bus route operated by IETT (Istanbul Electric Tramway and Tunnel Enterprises) in Istanbul, Turkey. The route runs from Şişli to Edirnekapı and passes through various residential and commercial areas, such as Beşiktaş, Kabataş, Eminönü, and Topkapı. The bus runs every day of the week, with frequent services during peak hours. The fare for BM4 is determined by the Istanbulkart system, which is a smart card used for payment on all public transport in Istanbul. The BM4 route serves as an important link between the European and Asian sides of Istanbul, providing a convenient and affordable mode of transport for commuters and tourists.