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The road is thus named in order to remember the Tamoio, the ethnic group of original Indian tribes who inhabited the coast from Santos to Espírito Santo at the time of discovery, in 1500. It was managed and maintained by the Department of Roads of the State of São Paulo (DER) until April 18, 2015. Now it's maintained by Ecopistas and Concessionária Tamoios. Toll was not required until 2016.
The section crossing the Serra do Mar was a single lane road until 2022, turning into a dual lane with the inauguration of a new 22 km-long road for drivers heading uphill on the Serra do Mar towards São José dos Campos in 26 March 2022. The project, that took seven years to complete, required the excavation of 1.7 million cubic meters of rock and the construction of six viaducts and four tunnels in an investment of over 3 billion reais. One of the tunnels, with a length of 5,555 meters, is the longest road tunnel in Brazil.[1]
