This paper discusses the potential use of stochastic processes as road vehicle velocity models for road transport emissions inventory purposes. Empirical studies have presented stochastic passenger-car velocity models, each modeling traffic conditions: in traffic congestion, in cities outside traffic congestion, outside cities, and on highways and expressways. Zero-dimensional characteristics of the model velocity processes have been examined. The characteristics of passenger car emissions for 2020 have been determined using simulation methods. Road pollutant emissions from passenger cars under specific velocity process implementations have been determined and analyzed. The research results have been assessed, among other things, for their variability. Based on the results, the feasibility of using stochastic processes as road vehicle velocity models for road transport emissions inventory purposes has been assessed.