Bus — there are 400 bus lines in Istanbul, the majority work daily until midnight. With the exception of Sultanahmet (accessible by tram), buses go all over the city. Destinations and major stops are marked on yellow signs on the sides of buses. Fares are the same as the Metro lines (as well as tram, funicular, and ferry (see above fare chart). The following website gives passengers the option of pulling up route maps:
Due to constant traffic problems in Istanbul, foreign visitors are discouraged from using buses (or taxis for that matter) and encouraged to use the Metro or other means of transportation (like the ferry – when needed).