# Reliability Analysis of Technical Means of Transport
## 1 Introduction
According to [18], the concept of transport system reliability can be applied to express the probability of a transport system satisfying the passenger demand for a transport service, without undesired events resulting from vehicle and infrastructure failure or the participation of other means of transport. The research paper [19] describes changes within the technologies for monitoring transport services and increasing their reliability in the era of advancing electronic communication and available localization technologies. In paper [20], the archived data from the automatic systems of localization are used to obtain information related to possible sources of vehicle unreliability. In the studies, the actual data from the CTM SpA public transport company from Cagliari in Italy were applied. The collected numerical data included 30 bus lines servicing approximately 35,500,000 passengers per year. A thorough analysis was conducted based on the archived data from the automatic systems of vehicle localization, whereas a reliability test concerned the prevention strategies. During the reliability analysis of the transport system, particular attention should be focused on the anomalies, which are frequently eliminated or neglected. In paper [21], the influence of the anomalies in the archived data from the automatic systems of localization is described in order to estimate both the regularity and the punctuality of transport services. From a passenger's perspective, the reliability of a transport system can be perceived in terms of delay (longer travel times). The source literature contains numerous reliability models for travel time in passenger transport, where the travel time reliability is studied, among others, in terms of measuring its duration variability [22; 23; 24; 25; 26], whereas the authors of [27] analyzed the travel time reliability based on a triangular distribution. An innovative approach to the problem of travel time reliability is presented in paper [28], in which two measurements of reliability are introduced, namely, PPR--the percentage of passengers receiving a regular service and PPP--the percentage of passengers receiving a punctual service. The proposed factors are of key importance while defining the capabilities of transport companies aiming to improve passenger service performance. Article [29] presents a public transport service reliability analysis using the graph theory. Paper [30] describes a thorough reliability analysis of a transport network, based on multimodal transport systems. In relation to the reliability of means of transport, the issue was analyzed in paper [31], in which the author focused on describing the reliability characteristics of means of transport within urban areas. Article [32] suggests a procedure for estimating the reliability measures for means of transport in relation to a selected route of municipal mass transit. The model, developed using the PT VISION VISSIOM (ver. 5.4) app, points out that the analysis covered only a single, 10.33 km long trolleybus route. It was emphasized that the conducted studies were based on a simulation model developed in the course of the previous research. As a result, in order to carry out a more thorough analysis, it would be necessary to extend the research area into a municipal transport system and take all public means of transport into account. The authors of this paper believe that the reliability of technical means of transport shall be understood as a foreseeable ability to perform a task that involves the correct use of the functions available within a specified time period, while simultaneously taking into account the actual operating conditions. The reliability of technical means of transport that provide services for the military is of crucial importance from the perspective of conducting operational tasks at various command levels.