 The municipal authorities grew increasingly intolerant of the Zabbaleen's donkey carts, which, according to Assaad, were considered an eyesore and a traffic hazard by the government.This was precisely in the neighborhoods that were being more fully served given Cairo's narrow, winding streets that are not wide-enough for large garbage trucks.Regardless, in the early 1990s, according to Fahmi & Sutton, the garbage collectors had to comply with the municipality's requirements to use motorized trucks, rather than donkey carts, as the authorities introduced a system of mechanization to transport solid waste.