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This article provides statistical data on the number of road accidents and their consequences (deaths and/or injuries) in all regions of Ukraine in 2021 as compared to the same period in 2020. Regions with a decrease in road traffic accident rates (Zakarpattya region, 9.6% decrease) and their percentage increase (Zhytomyr region, 56.1% increase) are highlighted. Based on the analysis of statistical data, it is estimated that the number of road traffic accidents in the country during this period increased by 19.6%. But as a positive phenomenon, the number of injuries and/or fatalities in these road accidents decreased by 17.2%. The article analyses and gives concrete examples of the use of some legally adopted road traffic control devices in the regional center of Ukraine - Zhytomyr city (traffic lights, road signs and road markings). Shows incidents of their use which are characterized by violations of traffic rules (Sections 8.1., 8.2, 8.3, 8.4, 8.7, Sections 33 "Traffic signs" and 34 "Traffic lanes"), DSTU 2587:2021 "Traffic lanes. General Technical Conditions", DSTU 4100:2021 "Road Safety. Road Signs". At the same time there are situations when road signs are in contradiction, which is categorically unacceptable. It also shows the cases where traffic signs are installed in a shape and design that is not included in traffic regulations and the relevant standard. It was concluded that the use of the above road traffic control devices in violation of the conditions of their installation (application) can lead to misinformation of road users, create additional informational and emotional pressure on them, contribute to increased fatigue, which consequently increases the probability of occurrence of road accidents and increases their importance.

The article analyzes the influence, relationship and value of design parameters of the heat flow meter on its radial and axial heat fluxes in the tube (tube diameter, heater diameter and their ratio, thermal conductivity of the tube material, etc.). It is shown that at the stage of choosing the design parameters of the flowmeter it is necessary to take into account the influence of its radial heat flux on the axial one. The influence of radial heat flux in the flowmeter tube on the error of fuel loss measurement is substantiated. Analytical dependences which allow to define an axial heat stream are resulted, their analysis concerning influence of flowmeter tube constructive parameters on heat transfer is carried out. Measures are planned and recommendations are developed for the choice of design flowmeter parameters, development or use, provided that the influence of radial heat flow on the axial is reduced, which will reduce the total error of fuel consumption measurement. Regarding the choice of design parameters of heat meters while reducing the error of measuring fuel consumption, it is shown that the maximum possible decrease in the diameter of the heater and increase the diameter of the flow tube reduce the impact of radial heat flow on the axial and thus reduce the total fuel consumption error. Numerical ratios of tube diameter to flowmeter heater diameter for different thermal conductivities of tube materials are given under the condition of minimal influence on fuel consumption measurement error. For tube materials with a thermal conductivity 0.16… 0.25 W / (m ∙ K) (ebonite, fluoroplastic F-5, etc.) the tube diameters ratio and the heater should be within 1.51… 1.62, and for materials with more high thermal conductivity (thermal conductivity greater than 14.9 W / (m ∙ K)), this ratio should be equal to 1.99.