Signs are mostly based on the United States' Manual on Uniform Traffic Control Devices (MUTCD) issued by the Federal Highway Administration (FHWA), sharing many similarities in design to road signs used in the United States, Canada, Mexico and Central American countries.
The vast majority of South American countries use yellow diamond-shaped warning signs as well as in the United States, Canada, Mexico and Central America.
Road signs in Colombia are regulated in the Manual de Señalización Vial standard, which is developed by the Ministry of Transport and based on the United States' MUTCD.
Road signs in Ecuador are regulated in the Manual Básico de Señalización Vial[7][8][9] and Reglamento Técnico Ecuatoriano.
Road signs in Venezuela are regulated in Manual Venezolano de Dispositivos Uniformes para el Control del Tránsito and are based on the United States' MUTCD.