The constant development of transport systems and the extensive activities related to the safety of its users necessitate
the development of methods for assessing the impact of road infrastructure expansion/modernization
on road safety. The objective of this paper is to elaborate the concept of such an assessment, which will form
part of the author’s activities aimed at creating a methodology for a comprehensive analysis of the operational
reliability of transport systems. The concept of assessing the impact of road infrastructure development on road
safety presented in this paper refers to the GAMAB and Road Safety Impact Assessment methods from the
subject literature. Our method is based on a comparative analysis of the condition of road infrastructure before
and following its expansion/modernization, based on commonly available data, which constitutes the main
advantage of the concept presented in this paper. Furthermore, the coefficients for occurrence of adverse road
events were determined, and then conclusions drawn on this basis. The acquired results constitute an argument
for the correctness of the presented concept.