A model for managing the system "road conditions - traffic flows" is proposed that allows to ensure the functioning of the complex "driver - car - road - environment" in any weather and climate conditions. The analysis of the proposed model and target functional shows that optimization of the "road conditions - traffic flow" system can proceed in many directions, the main of which are: optimal development and placement of the network of forest roads, improving their technical level and level of maintenance, road engineering equipment , efficient traffic management, excluding the rational distribution of forest traffic on the network of forest roads and the management modes on individual logging roads and sections of forest roads. The developed model makes it possible to carry out a theoretical analysis and experimental verification of the interaction between «driver-car-road-environment" system in order to identify the reserves of increasing efficiency of its operation and purposeful management of this process. Transport-operational characteristics of logging roads are the main factors that shape the conditions of timber transport on the road, mode, convenience and safety of traffic and determine the efficiency of road transport, and connections of many characteristics of roads with the traffic modes have deterministic, corrective character. These patterns are the basis for the development of technical requirements for logging roads. The proposed model for integrated creation and management of the functioning of a forest road may already be implemented. However, the design of roads is expedient to provide complex control engineering and organizational measures to ensure the estimated traffic conditions during the whole period of operation of the road, regardless of the time of year and weather and climate conditions. Evaluation of the effectiveness of taken decisions should be made with mandatory consideration for ensuring the required performance of logging road in adverse periods of the year and in difficult weather conditions

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Improving the technical operation of internal combustion engines (ICE) of automotive equipment (ATT) is inextricably linked with an increase in the efficiency of their maintenance according to the actual state. The studies were carried out on internal combustion engines with resource wear of more than 80%. The method and devices for increasing the resource of the internal combustion engine ATT were proposed in this work, differing from those known in that this process is carried out in a complex way by monitoring the condition of the oil using several sensors. Lightweight and portable unit, consisting of two modules, designed for express analysis of motor oils used in internal combustion engines. Sampling from the sump-crankcase of the operated ATT (without taking it out of service) in the amount of 100 ml. is carried out with a conventional syringe with a hose, through the hole of the dipstick for controlling the oil level. Temperature sensors; contact capacitive and non-contact capacitive; turbidity; induction magnetically sensitive, pH used in the first module of the device to determine turbidity, acidity, the presence of liquid and fine metal particles, etc. Information transmitted from the sensor is displayed on the information screen of the installation, as well as on the computer monitor in the form of graphs. This installation can work autonomously, which will allow it to be used in the field. A method for adding fresh oil to the ICE lubrication system, taking into account the draining of exactly that part of the oil where the main pollutants (deposit) are located, has been developed. Timely diagnostics of the condition and quality of motor oils will allow at an early stage to assess the degree of contamination, and partial draining of the sediment at the bottom of the oil pan will prevent possible breakdowns, and thereby significantly extend the life of the internal combustion engine and ATT as a whole.

The article discusses a perspective design of the drive of the drive wheels of the tandem bridge of forestry vehicles, which contributes to an increase in traction performance and an indicator of the efficiency of use.