The movement of a car is a complex movement, including, among other things, the vibrations of all major parts of the car and even their vibration. Vibration leads to deformations of vehicle parts and affects the well-being of the person driving this vehicle. Poor wheel balancing can be one of the causes of vibration. The smooth running of the vehicle, its handling and driving safety depend on the condition of the tires. Deformation of tires can cause by their incorrect centering relative to the main axis of rotation of the wheel, passing through its center of mass, that is, imbalance. The imbalance in the tires causes centrifugal forces, which cause shock to the wheels. This article discusses the options for the occurrence of imbalance in the wheel, provides calculations of the impact force of the imbalance and describes the actions to eliminate it. It is shown that a situation is possible when the impact force of static and dynamic imbalance is practically equal in magnitude, and in this case, to eliminate the imbalance, it is sufficient to carry out dynamic wheel balancing.

One of the important indicators in the road construction industry is the future traffic intensity. There are several approaches to its assessment, but they do not allow taking into account the peculiarities of traffic on certain sections of the road, the economic situation in the region, and others. The article presents an analysis of the dynamics of changes in traffic intensity. The work was carried out on the example of federal roads of the Altai Territory: P-256 «Chuysky Trakt » Novosibirsk - Biysk - Barnaul - Gorno-Altaisk - border with Mongolia, P-256 «Chuysky Trakt» Approach to the city of Barnaul, A-322 Barnaul - Rubtsovsk - border with the Republic of Kazakhstan. For the study, 4 sensors were selected, according to which the average daily mean annual values of traffic intensity were obtained in the period from 2015 to 2019. Based on the analysis of distributions, traffic conditions (suburban, suburban mode), assumptions were made about the trends of further changes in traffic intensity. The necessity of dividing roads into segments, taking into account the peculiarities of the movement, was confirmed.

The article considers the possibility of using vehicles in the system of internal affairs bodies of the Russian Federation, with power plants powered by gas engine fuel. Description of the main types of gas engine fuel is given, as well as their basic energy parameters and environmental characteristics. One of the options for transferring departmental vehicles to gas motor fuel is proposed. The average calculation of money savings from the use of gas engine fuel and the payback period for the conversion of departmental vehicles is presented. The rationale for using compressed natural gas as the main gas engine fuel is shown. Described is one of the options for organizing refueling cars with compressed natural gas directly on the territory of the departmental fleet. The main operational characteristics of power plants operating on compressed natural gas are considered, and the main advantages and disadvantages of transferring the departmental fleet to gas motor fuel are given.

The article deals with the problems of organizing the transportation of children in a passenger taxi. From the point of view of the current legislation in the field of taxi transportation, the requirements for a taxi driver are outlined and various aspects that affect the safety of transporting children are considered. The study revealed the need to tighten the requirements for the qualification and professional suitability of a taxi driver transporting children. During the analysis of legislative and regulatory acts, it was determined that there are no approaches to training and medical examinations of taxi drivers who are individual entrepreneurs with individual permits. There is a complete lack of legislative support for the issue of transporting unaccompanied minors in taxis, and there is no responsibility of parents for non-compliance with the requirements for transporting children. Recommendations are given for the revision of legislation in the field of regulating the transport of children by passenger taxi.

The article is devoted effective methods development for introducing asphalt millings into a new asphalt concrete mixture also with using anti-aging additives. The crushed old asphalt concrete formed during the road surfaces repair, subject to appropriate technology, can be reused efficiently. The authors investigate the characteristics and determine the resulting mixtures cost at using various percentages of recycled material. In addition to the main research it was extra tasks to study the fiber effect on the strength of asphalt mixtures. The possibility and expediency of using asphalt millings in asphalt concrete mixtures have been established. Basing on theoretical and experimental studies accordance in terms of physical and mechanical properties with the GOSTs requirements was found. Using road repair works waste as a full-fledged asphalt concrete component allows to solve environmental problems, reduce a new mixture production cost, and save energy resources.

The article is devoted to the current topic of designing drainage system for receiving and discharging water from ground catchment areas. The calculation is based on the parameter – the time of runoff formation when precipitation falls on ground surface. The value of this parameter depends on the intensity of precipitation on the ground surface, as well as on such parameters as the intensity of water absorption into ground. The existing dependence of determining the time of runoff formation gives contradictory results. When an increase in precipitation intensity and a decrease in absorption intensity the runoff time increases according to the existing relationship. The article deals with the issues of runoff formation on ground surfaces of airfields, determines the factors that affect the amount of runoff time. It is proposed to take into account the value of the critical water layer after exceeding which the runoff begins. A formula for determining the runoff time is proposed.

This article presents the opportunity to assess the situations of the roads in Republic of Iraq, (inclouding the high traffice voulme roads, such us, the roads of Baghdad), and to choose appropriate road maintenance technologies based on the parameters of transport and operational characteristics, for example, road safety, environmental conditions. 

Taking in to the consideration that the classification of highways and the assessment of functional transport-operational and consumer roads will allow predicting the condition of the road for the future and their service life, as well as what technologies for repairing road pavements can be carried out and also the amount of money that needs to be allocated for repairs in the complicated conditions of Iraq.

This article is devoted to the condition analysis and modern methods development for restoring cement concrete pavement evenness of the M-4 "Don" highway using example of section «Moscow Ring Road – Kashira» (km 52 - km 71). With mobile road laboratory rut formation dynamics on a cement concrete pavement was assessed. The possible causes of this defect were studied. Based on data obtained, a number of effective and economical methods was proposed for cement concrete pavement restoration. A detailed technology description using modern mechanisms and materials is given. Timely implementation of road repairs to eliminate rutting will extend the service life of cement concrete pavements up to 30 years and reduce the need for more expensive work in case of deep pavement damage. The repair methods considered in the article were recommended by the Avtodor State Corporation for practical application.

At the maintenance stage of operation of roads for various reasons, it is necessary to carry out major repairs of pavement. The most common way to restore the strength of pavements in practice is to strengthen them: laying new ones or replacing existing upper layers, in most cases of asphalt concrete. The thickness of the reinforcement layers is calculated on the basis of information about the actual and required general elastic moduli of flexible pavements. The article gives an overview of the models for recalculating elastic deflections obtained by the installations of the static and dynamic loading principle. The results of a computational experiment to determine the thicknesses of the gain layers according to an industry normative document based on information on actual dynamic elastic deflections are presented and compared. A proposition has been made and substantiated that the actual durability of flexible pavements is incorrectly estimated by the settings of the static principle of operation, since when designing flexible pavements, the design scheme with dynamic characteristics is.

Automotive thermoanemometric sensors of mass air flow are simple and compact, but have a number of disadvantages, such as the sensitivity of the measuring element to contamination and a strong dependence of the readings on air humidity. This causes the electronic control unit to incorrectly calculate the duration of fuel injection. The proposed sensor is designed to measure the mass flow of air entering the car engine during bench tests. It is compact and highly accurate. The operation of this sensor is based on a directly proportional relationship between the torque of a straight-blade cylindrical impeller installed in a moving medium and the mass flow rate.

This article discusses the main operations performed by the machine for washing tunnels, walls, arches, sidewalks, chemical dispersion and morphological analysis of the composition of pollutants.

The organization and maintenance of tunnels on Federal roads, regional or municipal and local roads is carried out at intervals of 2 times a year. The tunnel is polluted depending on the type of transport, capacity, time of year and weather conditions. One of the most important factors of pollution is the type of engine installed in the car: petrol or diesel.

The main purpose of the scientific article is to describe the methodology for conducting six experiments that allow determining the efficiency of the pile of different stiffness, with different pile length and different brush speed. it allows us to conclude about the effectiveness of the pile samples, the required time for washing the tunnel to achieve high quality cleaning and minimize the number of passes of the pile.

The most important vehicle properties that are affected by the quality of steering design are agility, handling and stability. Maneuverability is characterized by curvilinear movement with small turning radii at low speed, while controllability and stability are manifested mainly during emergency maneuvers at high speed. High maneuverability is important in difficult urban conditions, when driving in heavy traffic and when parking. The maneuverability of special-purpose vehicles is characterized by such parameters as the minimum deviation of the trajectories of the main point of the tractor and the characteristic point of the semi-trailer, the minimum turning radius and the width of the lane. The controllability and stability of special-purpose articulated vehicles substantially depends on the law of steering the wheels of the trailer link. Steering angles also have a significant impact on handling. Prediction of the listed properties depends on the steering parameters, in particular, on its gear ratio. At the same time, the layout of special-purpose tractors assumes the location of the cab in front of the front axle, therefore, the steering drive includes a steering mechanism with an output link of a rotary type and a longitudinal rod connecting the bipod with the swivel arm of the front left wheel. Steering control design provides for kinematic, power, dynamic and strength types of calculation, as well as calculation of the amplifier, if available. Traditionally, the determination of the gear ratio is carried out within the framework of kinematic and dynamic calculations by the geometric, vector or analytical method. However, all three methods are rather laborious and have low accuracy, especially when solving a spatial problem. In this study, the author has developed a coordinate-iterative method for selecting the parameters of the steering drive and calculating the angles of rotation of the steered wheels in a three-dimensional coordinate system.

In recent years, the system of road transport infrastructure in Vietnam has been developing quite strongly, with strong changes in the direction of modernity. However, the quality of the road network is not sufficient to meet the needs of the dramatic increase in the number of vehicles. The road network is characterized by an unsatisfactory state of the road surface and insufficient technical and operational indicators of highways, which play an important role in ensuring traffic safety.

In the article, based on the data of road traffic accidents in the Thai Nguyen city, the author considered the impact of shoulder width on the safety of vehicles and established the pattern of the influence of shoulder width on the accident rate for the Thai Nguyen city, Vietnam.

The article presents the results of the analysis of the transport infrastructure of Russia. The most promising directions of transport development are considered. The analysis of investments in the development of transport and transport infrastructure is carried out. The importance of state interests in the development of the transport system is considered.

the article deals with the problems of import substitution, structural optimization of production capacities and processes, diversification, financial and personnel support for the functioning of its branches and organizations that are common to the Russian military-industrial complex. The article summarizes the views on decision-making on attracting organizations of the military-industrial complex to diversify with the entry into the market of civil and dual-use products, which should be based on a differentiated and production-oriented approach. Justified and proposed approaches to solve financial and personnel problems, to pre-determine the creation of public financial institutions (banks) to provide concessional lending to organizations of the military-industrial complex, as well as the formation in the sphere of military-industrial complex state pedagogical system for target selection, placement, training according to the established list of basic professions, and education of professional labour resources to ensure the staffing needs of the various industries and organizations.

The article considers the organizational and sectoral structure and composition of the military-industrial complex of the Russian Federation, its role and significance for the development of the country's economy. Specific features and main functions of the military-industrial complex are defined. The annual volumes of production and export of military, civil and dual-use products, as well as General and sectoral indicators of the production activity of the military-industrial complex for 2017-2019 are analyzed, summarized and presented.they clearly confirm the stable annual increase in the quantitative and qualitative parameters of its functioning, and the main task of further development is formulated. The conclusions summarize the results of the study, which indicate a system-forming role in the development of the country's economy.