The issue of risk assessment in road freight transport is currently a significant research gap, which is why the authors decided to conduct research in this field. The article presents a risk assessment model for the occurrence of undesirable events in the transport of oversized cargo. A critical review of the literature on the latest research on risk analysis and methods and tools for assessing the risk of road transport is presented. Based on the identification of the occurrence of various undesirable events, the authors proposed a general approach to the risk assessment model using a risk matrix. Elements of the transport network structure and parameterization of cargo and means of transport were identified and a record was provided. Significant limitations were indicated and a formal record of the probability of occurrence of undesirable situations was proposed. An important element of the article is the presentation of the procedure for calculating the probability of the effects of undesirable events and a practical example for real data for road transport of oversized cargo.