The American Embassy in Brasilia states that it does not require seat belts, as all of its vehicles are already equipped with them.:
Citation
Amembassy Brasilia,
"Administration: Safety Seat Belts for Motor Vehicles, April 4, 1966"
(1966).
Opening the Archives: Documenting U.S.-Brazil Relations, 1960s-80s.
Brown Digital Repository. Brown University Library.
https://repository.library.brown.edu/studio/item/bdr:k9dbbhhx/
Opening the Archives is a joint effort by Brown University and the Universidade Estadual de Maringá, Paraná, Brazil to digitize and index 100,000 U.S. State Department documents on Brazil from 1963-73 and make them available to the public on a …
