In this article, an analysis of modular truck application in the road transport in Poland has been made. Terminology has been unified. Classification and law regulations applicable in different European countries and all over the world have been discussed. An analysis of existing solutions has been made and an optimal variant for road freight transport, including the condition and parameters of the road infrastructure in Poland, has been proposed. The study presents initial conceptual assumptions of this project as well as advisability of using these modular trucks, on the basis of a selected research object – the analyzed transport company. On this example, an analysis of costs and potential profits to be generated from transport services performed using the proposed modular trucks and with reference to costs borne by the investigated company with the use of currently operated transport means, has been made.
Identification of boundary values and features which describe a system operation safety is a crucial problem for assessment of the system operation safety. In this article, an attempt to match features necessary for a description of a given system operation safety and determine their boundary values, has been made. Determination of boundary values of safety features will allow to evaluate the system safety level. The following variables have been accepted as safety features: the number of accidents, the number of fatalities, and the number of people injured in those accidents. According to these values, probability values of the numbers of people who were killed and who were injured in those accidents have been established. Probability value equal to zero has been accepted as the intentional state, the interval between 0 and the mean value of a given feature determines the acceptable state, the interval between the mean value of a given feature probability and value 0.1 determines the boundary state, whereas all features assuming values higher than 0.1 refer to the system critical state. The presented research results are considered as directives for development of safety criteria for road transport systems and determination of their critical values. The proposed method of boundary values determination can be used for assessment of safety for different transport systems.
The article presents a method for assessment of availability and risk functioning of technical objects (transport means) in an executive subsystem. Indexes of the availability and risk connected with functioning of a single technical object have been determined on the basis of a mathematical model of the operation and maintenance process, in the studied transportation system. A Mathematical model of the operation and maintenance process has been developed with acceptance of an assumption that the process model is to be represented by a homogeneous Markov model X(t).
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