On the priorities for infrastructure in developing world "slums," the entry-level neighborhoods that tend to welcome new arrivals from the countryside:
Sewage, garbage collection and paved roads are, for obvious reasons, vital, and can be provided only from outside. But even more important, in the well-informed view of slum-dwellers, are buses: affordable and regular bus service into the neighbourhood is often the key difference between a thriving enclave and a destitute ghetto.
Doug Saunders, Arrival City:
How the Largest Migration in History is Reshaping Our World.