Increasing mobility directly affects traffic frequency and thus increases the possible risk of traffic accident occurrences. Taking this into account, it is necessary to create models for determining risk and to act preventively based on these models; this is of great importance both to society and science. In this paper, six measuring sections of a road network are considered on the basis of eight geometric-exploitation road parameters, taking into account the data for light goods vehicles. An original methodology is proposed for identifying risk levels of road sections through their evaluation. For identifying risk levels, the Dombi Logarithmic Methodology of Additive Weights (D’LMAW) was used, which was combined with the Measurement Alternatives and Ranking according to the Compromise Solution (MARCOS) method. Statistical indicators were processed using a hybrid methodology based on the application of rough numbers and Dombi–Bonferroni functions. The performance of the presented methodology was verified on a real-world example, processing the statistical parameters of six two-lane road sections, with the sixth measuring section showing the best performance, since it had the minimum risk. Research has shown that measuring sections with increasing longitudinal gradients are safer. The analysis of measuring sections from fall to rise reduces the deviation of speeds from the speed limit on the roads. The effectiveness, rationality, and robustness of the solution of the proposed methodology was confirmed through a sensitivity analysis.

The impact of the quality of electricity on the pantograph is an important parameter for the supply of locomotives in railway companies (RCs). The subject of this research is the analysis of the quality of electricity on the pantograph of the 441-series locomotivelocated at distances of 1 km or 35 km from the power station in the electric traction system of Serbian Railways. The analysis included the simulation of the system in the MATLAB-Simulink software package (R2016a), which resulted in data that were often difficult to measure due to the complexity of the electric traction system. The obtained values indicate that the total harmonic voltage distortion on the pantograph of the 441 locomotive is 16.34% for 1 km and 51.06% for 35 km, while the EN 50160 standard prescribes a maximum of 8%. The total harmonic distortion current in the electric traction substation and through the locomotive pantograph is 33.42% (for 1 km) and 32.53% (for 35 km), showing anomalies in the supply of locomotives in RCs.

Today, a large number of citizens have to use public transport as well as their own, in order to go to work, to complete business obligations in different parts of the city or to use them during vacation or recreation. The above implies an organized traffic system that implies the functioning of all entities that directly or indirectly participate in the implementation. A large number of means of public transport, private cars, motorcycles, scooters and cyclists can at a certain moment create congestion that certainly disrupts daily traffic flows. When unplanned actions take place, there is a danger that for a certain period of time there will be a stoppage and even an interruption of traffic on a certain section of the road. Such situations cause nervousness among drivers, decrease concentration and unintentionally cause traffic accidents. The main goal of this paper is to present a model of electronic business that includes remote regulation of traffic from the dispatch centre, available horizontal and vertical signalling using blockchain technology. Innovative blockchain technology is currently the best protection mechanism for digital processes that take place in wired and wireless networks. In addition to the above, the protection system includes the storage, memorization and forwarding of a large amount of information, which, through later analysis, can represent the starting point for planning future models. Traffic regulation based on advanced Internet technologies certainly increases the throughput of major intersections as well as primary roads that are important for fire engines, police and emergency services.

Railway companies, in accordance with their vision and mission, have the basic task of traffic management as well as the transportation of users and goods. In order to regularly carry out business tasks, railway companies increasingly apply the available systems and technologies of electronic business. Basically, electronic business enables the modern implementation of business activities through digital channels. Today, traditional business models are being completely replaced by innovative digital models based on a large percentage of the use of computer systems in both companies and individuals in their homes. This innovative electronic business system requires the protection and security of all participants in digital communication processes. This paper presents cyber security mechanisms that can be applied by railway companies in business. The main goal is a comparative analysis of the protection mechanism, which includes the components of traditional protection systems that are already in place, up to modern ones that include the application of blockchain technology.