The paper presents VERT, an R package to estimate traffic emissions following the EMEP/EEA methodology. The article is well organized showing some practical applications of the package. In general, I would like to suggest also to include specific section or comments regarding the foreseen calculation time and efforts also in relation to the resolution of the estimates.

Referring the line number of the preprint, please find here some specific comments:

Line 41 – the non-exhaust and resuspension emissions are treated in VERT. I suggest adding specific comments also in this abstract on traffic emissions.

Line 136 – please add in text or refer how the vehicle speed is calculated.

Line 435 – The authors try to explain the calculation differences between VERT and similar software:

“Differences can be identified in the aggregation of vehicle classes of the fleet composition and the way this data is used in the calculation. INEMAR uses the total number of registered vehicles in the region (ACI, 2023) and assumes that these vehicles travel on the reference road network according to the flows simulated by PTV VISUM. Emissions are then calculated on the basis of vehicle 440 movements. Conversely, VERT uses a percentage fleet composition to estimate an average EF for each vehicle category of the simulated flows. The reference EF are then multiplied by the simulated flows to obtain the final emissions. In addition, the fleet composition processed by INEMAR is not normalised by actual kilometres travelled by vehicle category.”

These comments are not clear. To support the analysis, it will be useful reporting a synoptic table resuming all the main hypothesis between the two model on all the input variables, also specifying e.g. if the road network, main fluxes and fleet composition are the same and how they are treated by the models.

It will be useful also adding some comments on the road network resolution; are all the streets treated by the model? If not, is it possible to propose how estimating emissions on all the roads?

\Paper entitled “Description and validation of VERT 1.0, an R-based framework for estimating road transport emissions from traffic flows”, describes VERT (Vehicular Emissions from Road Traffic) created in R package, that allows estimating traffic emissions. This topic is essential for improving emission inventories for different spatial and temporal resolutions. In general, minor revision is recommended.

General comments:

1) Line 134 and Eq. 3. The authors mention experimental coefficients. What are the values of these coefficients? Are they incorporated into the VERT code? It would be better to provide more details on the procedure for their estimation. Were these coefficients approximated by a polynomial trend or somehow else?

Also, there are some hesitations concerning the term “D/velocity” in Eq.3. Taking into account that VERT can be used for simulating hourly emissions, do authors consider the possibility of almost zero vehicle speeds? It relatively frequently occurs in megapolises during rush hours or under some emergency conditions on the roads.

2) Line 314-320. The authors mentioned the complex topography of the studied domain. It will be useful to provide additional details on land cover and topography data input to the model. Also, there is no information about meteorological input, including its temporal and spatial resolution.