sentences:  In Brazil, toll roads are a recent institution, and were adopted mostly in non-federal highways.The state of São Paulo has the highest length of toll roads, which are exploited either by private companies which bought a concession from the state, or by a state owned company (see Highway system of São Paulo).In São Paulo there is also a statewide electronic collection system using a plastic transponder (e-tag) attached to the windscreen, named "SemParar"'.