The partially opened stretch entails a 4.2km newly paved road. The rest of the US$64mn project is expected to be fully operational by November.
Distributor's sales and imports also dropped year-on-year, industry data shows.
The aim is to deploy 10.9km of underground cables in the cities of São Paulo and Curitiba.
There is enough investor demand for the small bank to go ahead with its IPO plans but the pricing of the shares could become a disappointment if the operation proceeds.
The Brazilian construction group is in talks with Ashmore to sign up to a bond issue.