Before its independence, Côte d'Ivoire had only a small-scale public transport service. Since 1960, under the impetus of its first president, Félix Houphouët-Boigny, the country has developed infrastructure and a quality and quantity of road transport fleets, making it one of the largest and most viable in West Africa. However, in view of the demographic explosion and the galloping urbanization of the city of Abidjan, the problem of the mobility of the populations will be posed with acuteness, to which private initiatives, first the "gbakas" and then the "wôrô-wôrô", will bring a beginning of answer by ensuring the intra and inter communal services. This change in the face of land transport in Abidjan will enable this sector to perform important social and economic functions. From then on, it will give rise to a phenomenon whose manifestations are both sources of urban violence and future conflicts: the "gnambro" phenomenon. How did this happen? Who are the "gnambros"? Was this phenomenon predictable?