A broad analysis of the influence of logging types in determining the optimal distances of forest transportation is presented. Taking into account the methods of forestry and types of logging, the specific costs of primary transportation of the forest are presented and justified, as well as the selection of final felling schemes. The objective function is defined, which is the main part of the mathematical model, including all the elements and connections of the system of feasibility study of the elements of the plan of logging roads. It is concluded that the search for the optimal distance to the destination is reduced to the performance of not only transport, but also technological operations by the machine, which in turn do not affect the value of the variable part of the unit costs and the primary transportation of the forest, if this does not cause an increase in the cost of tractor exchange or a decrease in payload. Calculations have shown that highly mechanized methods are more effective, since the specific monetary costs for the entire complex of logging operations according to the schemes do not exceed 20 %. The expediency of using any of the technological schemes of logging depends on the specific conditions of logging.

The peculiarities of the research work are stated and the need for its further development is shown. Taking into account the structural links and limitations of the system, a mathematical model of the feasibility study of the total reduced costs of the route plan, the longitudinal profile and the width of the carriageway was compiled, which has a various amount of construction and operating costs reduced to the initial year in a predetermined search area. The objective function is determined, which is the main part of the mathematical model including all the elements and connections of the feasibility study of the timber haul roads elements. It is concluded that the search for the optimal combination of geometric elements and the timing of their change is an extreme task, and the best method for solving it is to determine the state of the system corresponding to the minimum value of the objective function, which is the sum of construction and operating costs reduced to the initial year.