Edit: A better example for you would be Singapore, with its history of public housing, which gets privately owned (or 99-year-leased). They also have public roads.
Developers acquire new plots of land from local governments and are mandated to construct something more or less immediately. Developers can't sit idly on vacant land and wait for the surrounding area to develop until it's economically viable. This creates the quick-buck mentality in developers to rapidly build in the new area without the necessary demand for housing.
"The cities are product of plan-driven economy that many cities are not expected to be complete or vibrant after 15 years of construction."