Kaduna city region rapid urban sprawl is a singular case of globally spread phenomena. Each practice of rapid sprawl is unique, characterized by local conditions of topography, climate, economics, politics and legislation, history and mostly - social orders and norms. Though essentially different from one another, mutual characteristic of rapid sprawl is the tension between the formal and informal. Apparently, the gap between demand and supply skips the constraints of the formal, as demand for a shelter is a basic, natural need of homo sapiens since prehistoric times. Development of urban fabrics, constructed by ‘informal’ social orders, clarifies its role in shaping spatial patterns of life. The urban process, doesn’t count the legality of the actions within it - it's the sum of natural vectors of development and modification, of life - within its spatial boundaries. Therefore, the urban process cannot be ceased, but supported in a way that will promise the future reciprocity of the city entity. It follows, that exclusion of bottom-up development process as illegal, or informal, ignores the urban process as a whole and prevents its sustainable development. The inclusion, or regulation of the informal, is essential and would lead for an increase of social capital of the city as a whole. In particular, bottom-up development in city regions which consist ethical conflicts, are the spatial performance of territory rival relations. The exclusion of those consists vast political derivatives which increase tensions and risks. Therefore, regulation of the informal must be homogeneous within those areas. Transport oriented development, is a top-down development mechanism which allows softening the borders of collision among the formal and the informal, and enhances circulation among the urban fabrics. Embedded infrastructure provides a base for interaction and development of mutual dependencies between informal neighborhoods and the formal city, for the increase of connectivity and social capital of the urban entity. A road - is an economic vein, a service vessel, a sustainable development vector, a section of the urban entity circulation web - Now it's clear why we planners mark it in red.

Essay heads:
1. Intro for planning in Nigeria
2. The city of Kaduna
3. Kaduna - contemporary rapid urban sprawl

4. Current condition analysis - opportunities & constraints

5. Social constraint - The blue reflection line of Kaduna

6. Theories of urban form and spatial development - Interpretation and application

7. Methodology, Approach - and some more theories

8. Connectivity as an engine for sustainable development

9. Proposal key aspects

10. Conclusions