To cite package ‘ttcalib’ in publications use:

  Padgham M (2024). _ttcalib: Calibration of travel times to empirical
  data_. R package version 0.1.0.009,
  <https://github.com/urbananalyst/ttcalib>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ttcalib: Calibration of travel times to empirical data},
    author = {Mark Padgham},
    year = {2024},
    note = {R package version 0.1.0.009},
    url = {https://github.com/urbananalyst/ttcalib},
  }