The article deals with the study of strength properties of materials used for horizontal road marking. The investigations were carried out on the basis of the chair “Construction and Maintenance of Roads” of MADI and NTTs “Katafot”. The tests were performed on marking materials that are most common and frequently used in the Russian Federation. Thermoplastics and cold plastics were selected for research. For the tests, up-to-date high-precision equipment (AMPT / SPT installation) was used, which made it possible to take measurements in automatic mode as well as to save and process data. During the experiments, the dependences of the dynamic modulus of thermoplastics and cold plastics on the frequency of load application (loading frequency) and temperature were investigated. The researches resulted in recommendations for the use of materials to arrange the horizontal road marking under various operating conditions. The aim of the study is to improve the quality and durability of road markings as well as to ensure road traffic safety. The current scientific work has relevance to the implementation of the national project “Safe and High-Quality Roads”.

The work deals with improving the method of a complex estimation of highway maintenance quality. The methods of estimation of highway maintenance quality were analyzed. The most complete and reasonable estimation is reached using a complex method. This method takes into account the influence of different transport and operating characteristics on providing secured speed of cars. The car speed impacts on the efficiency of motor traffic. One of the indices influencing the car speed is a road roughness. Today, in the Russian Federation the road roughness is estimated using the International Roughness Index (IRI). But the complex method doesn’t take into account the state-of-art measuring means as well as the International Roughness Index (IRI). The theoretical and experimental studies were carried out to establish the dependence between the IRI index and a partial coefficient of providing the design speed of cars. The model to define the partial coefficient of providing a design speed based on the International Roughness Index (IRI) was offered. The table for calculation of the partial coefficient of providing a design speed was offered as well.