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Eixo Monumental is the world's largest avenue when measured from one side to the other, including the midsection's esplanada. However it has less car lanes then 9 de Julio.   

 Difference between ""Esplanada dos Ministérios"" and ""Eixo Monumental"" 

As far as I know Brasília, the name ""Esplanada dos Ministérios"" (Ministries Esplanada) is used only to the first section of the Eixo Monumental, where the ministries are located. The names are not interchangeable.   "