Subject: dynamic interaction of the vehicle with the road pavement. Research objectives: analysis of various models for calculating the dynamic factor of pavement. Materials and methods: a) the research material is the formulas published in the open press and regulatory documents for calculating the dynamic factor of the road pavement; b) the main research method is a comparative critical analysis of various models of road dynamic factor. Results: various formulas for calculating the dynamic factor are analyzed, their advantages and disadvantages are revealed. Conclusions: 1) The need to improve existing formulas for calculating the dynamic factor in order to more fully take into account all the factors influencing it (geometric and material parameters of the road construction, constructive parameters of the vehicle, condition of the road pavement, geometry of roughness, etc. 2) Some formulas for calculating the dynamic factor give a average value for a some uniform road section. Therefore, the data obtained using these formulas make it possible to carry out a comparative analysis of different sections of roads according to the level of dynamic impact. Using other formulas that take into account the geometry of unevenness, one can determine local dynamic overloads, and, accordingly, predict the development and accumulation of deformations of the road pavement.