D2D is a promising paradigm of the 5G network offering a beneficial infrastructure and allowing different applications such as social applications, advertising services, or those supporting mutual connectivity of heterogenous objects, as well as those offering support in cases of natural disasters. Compared to conventional network communication, communication achieved by D2D technology shows a lower degree of security. It is necessary to modify existing security mechanisms and new solutions to be adapted to the application of D2D in the fifth generation network, which will raise the level of security in terms of authenticity verification, ensuring service availability and maintaining integrity.

The development of new technologies has significantly influenced railways modernization and has caused the appearance of high-speed rail which represent a safe, comfortable and ecologically sustainable way of transportation. The high-speed rail present a big step in a relation to conventional railways, where the biggest difference is speed which even entails a change of other organizational and operational parameters, better utilization of trains, higher performance of manpower and better service to users.  That is visible in many cities around the world where high-speed trains are used by billions of users. In the EU there is no unique high-speed railway network, besides that in many EU member countries various operational models are applied. The future of the high-speed railways market depends on political, economical and technical factors and challenges as high infrastructure costs, various rates of return on investment and the negative effects of economic crises. The main objective of the paper is to analyze infrastucture costs of high-speed rail in Europe and benefits such us  time savings, higher reliability, comfort, safety, reducing pollution and the release of capacity in the conventional rail network, roads and airport infrastructure.

In recent years, the European Union is a committed to sustainable development and has successfully integrated the sustainability dimension into many policy areas. The White Paper on Transport (2011) emphasises key objectives to ensure a sustainable European Union's transport system by 2050. In order to achieve these objectives, 30% of road freight transport should be shifted to railway and water transport as environmentally friendly modes of transport, at distances greater than 300km by 2030, and even more than 50% by 2050. Modal shift as a new paradigm of EU transport policy should be realized by the construction of efficient green freight corridors, requiring an adequate infrastructure and an efficient information and management system within the European multimodal transport network. Extension of the indicative TEN-T (Trans-European Transport Network) to Bosnia and Herzegovina offers an opportunity to become an integral part of the European multimodal transport network and to provide sustainable and effective transport rising the modal shift from roads to railways. In this paper, the modal shift on the TEN-T Corridor in Bosnia and Herzegovina will be modeled using a multi-criteria analysis focusing on the Analytical Hierarchy Process (AHP) software Expert Choice, to determine the weights of a range of criteria identified as influencing modal shift. The results obtained by this model will be discussed and an analysis of potential positive effects of modal shift in the economic, social and environmental aspects of sustainable transport will be given.

Development of high-speed railways set up challenges for new communication technologies. With the increase in speed, new requirements for communication systems have emerged that HSR requires greater reliability, capacity and shorter response time for efficient and safe operations. Mobile communication systems are crucial for the competitiveness of the railway industry and therefore have become one of the priorities addressed by the participants in the railway system to take advantage of technological opportunities to improve operational processes and the quality of provided transport services. The European Rail Traffic Management System (ERTMS) uses the Global System for Mobile Communications for Railways (GSM-R) for voice and data communication to communicate between trains and control centers. The International Railway Union is exploring new ways of communicating for high-speed railways because as speed increases this system becomes unreliable in information transmission. This paperwork presents an analysis of the evolution of communications on European railways since the usage of GSM-R. In addition, an overview of the various alternative solutions proposed during the time (LTE-R, Future Railway Mobile Communication System) as possible successors to GSM-R technology is given.