OFTEN when one thinks or writes about urbanisation in Africa, mega-cities or primary cities like Lagos, Nairobi, Addis Ababa or Kampala, come to mind. Little, however, is written about places like Gabés in Tunisia, Touba-Mbacké in Senegal, or Ibadan in Nigeria. Yet these are just three of an estimated 885 secondary, or intermediary, cities in Africa that already account for over 40% of the continent’s urban population. Their share is very likely to grow over time. Author ASTRID R.N. HAAS, Fellow, Infrastructure Institute, School of Cities, University of Toronto These cities have a critical role to play in Africa’s overall…