This article presents the results of assessing the impact of means of individual mobility on the indicators of traffic flow by finding the dependencies of the speed of traffic flow on the number of SIM on the road network (UDS) in the morning rush hour, evening rush hour and inter-peak [1]. The purpose of the study is to obtain real values of the speed of the traffic flow for further analysis and comparison, which in the future will allow us to understand how the number of means of individual mobility [2] affects this value (study of the speed indicators of the traffic flow as a result of changes in its composition, taking into account the appearance of SIM). It is proposed to use a method for finding intermediate values, namely the interpolation method of the Lagrange polynomial. With its help, it is possible to find the values of the speed of the traffic flow.