ef_brazil_cetesb        Running exhaust emissions factors for buses
                        from Brazil (CETESB)
ef_brazil_cetesb_db     Emission factors from Environment Company of
                        Sao Paulo, Brazil (CETESB)
ef_europe_emep          Speed-dependent emission factor from the
                        European Environment Agency (EMEP/EEA) model
ef_europe_emep_db       Emission factors from European Environment
                        Agency — EMEP/EEA
ef_scaled_euro          Scale local emission factors in order to make
                        emission estimates a function of speed.
ef_usa_emfac            Running exhaust emissions factors for buses
                        from United States (EMFAC2017 model)
ef_usa_emfac_db         Emission factors from California Air Resources
                        Board (EMFAC Model)
ef_usa_moves            Running exhaust emissions factors for buses
                        from United States (MOVES3 model)
ef_usa_moves_db         Emission factors from MOtor Vehicle Emission
                        Simulator (MOVES) Data.frame of emission
                        factors for buses based on values from the
                        MOVES3 Model. Estimates expressed in units
                        'g/km'.
emi_europe_emep_wear    Emissions from road vehicle tyre, brake, and
                        surface wear from the European Environment
                        Agency (EMEP/EEA) model
emis_grid               Spatial aggregation of emission estimates into
                        a grid
emis_summary            Summarize emissions estimates
emis_to_dt              Convert emission estimates from list to
                        data.table format
emission_model          Emission model
slope_class_europe_emep
                        Add slope class into the transport model
                        (LineString Simple Feature object)
transport_model         Transport model
