Running westbound from the city of São Paulo and finishing in Espírito Santo do Turvo, while heading towards the state of Mato Grosso do Sul, near the northern border of the southern state of Paraná, 'Rodovia Castelo Branco, as it is popularly known, is about 315 km (196 mi) long, and one of Brazil's safest tollways.

Near Barueri and due to the large population of São Paulo, Rodovia Castelo Branco is one of the busiest and widest of Brazil's tollways.

The tollway is managed and maintained by a state concession to three private companies: SPVias, Rodovias das Colinas and ViaOeste.

Together with the Raposo Tavares Highway (SP-270), it links the capital of São Paulo to the western interior of the state, known as the Castelo-Raposo System.

The concessionaire CCR ViaOeste estimates that around 100 thousand vehicles will travel through the Castelo-Raposo System on a daily basis.