Especially in Istanbul, I guess it would be hard because 1) Roads change all the time, tunnels are built, huge sections of the city gets randomly closed to tra

Especially in Istanbul, I guess it would be hard because 1) Roads change all the time, tunnels are built, huge sections of the city gets randomly closed to traffic permanently and so... 2) Istanbul doesn't have a proper road/street system but something which rather seems to be some paths randomly crossing and a lot of houses built in the smallest possible remaining land. It's also generally not clear which roads are public and private.