To cite package ‘bfr’ in publications use:

  Dervieux C (2018). _bfr: Get data about french traffic prevision_. R
  package version 0.0.0.9000, <https://github.com/cderv/bfr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {bfr: Get data about french traffic prevision},
    author = {Christophe Dervieux},
    year = {2018},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/cderv/bfr},
  }