These days, change appears the only constant in Africa’s largest cities. Across the metropolises of Lagos, Nairobi, and Addis Ababa, half… — These days, change appears the only constant in Africa’s largest cities. Across the metropolises of Lagos, Nairobi, and Addis Ababa, half constructed apartment buildings reach toward the sky. New roads quickly find themselves overburdened, unable to carry the ever-growing flow of cars and buses that compete to conquer every square…