Monitoring vehicle movements at roundabouts and determining their operational throughput traditionally relies on tracking individual turning movements, a process that is technically demanding, labour-intensive and often impractical for complex multi-leg roundabouts. This study proposes a simplified approach to data collection and the determination of roundabout flow parameters. Two data collection techniques were examined: simplified manual counting of vehicles at entry legs and automated licence plate recognition. For roundabout flow parameters, determining the key methodological contribution is applying the roundabout investigation model (MIKR). Model MIKR enables capacity and turning-movement estimation using only entry and exit counts, thereby substantially reducing the scope of required field observations compared with conventional trajectory-based methods. The results show that licence plate recognition can determine turning flows with an accuracy of approximately 90%. The MIKR model reliably estimates roundabout capacity without requiring vehicle trajectory tracking. These findings confirm the practical value of the MIKR approach and highlight its potential for more efficient and cost-effective traffic-flow analysis at roundabouts.

The Faculty of Transport and Traffic Engineering of the University of Belgrade, the Traffic Engineering Module and the Department for Transport Planning and Traffic Control are organizing the 14th International Scientific-Professional Conference on Techniques in Traffic Engineering (Traffic Engineering Saobraćajno inženjerstvo) "TESi". We continue the tradition of gathering traffic experts.Program areas covered by the conference are:- Traffic control and management- Transport planning- Traffic flow and road network efficiency- Traffic design- Parking

The passenger transport system in cities is the backbone of sustainable urban mobility. The problem faced by the city authorities is the question of choosing the carrier with the best bid in the public call. Services in charge of public transport are often able to choose carriers for one or more lines, and often for the entire area. The basic dilemmas are related to the type of procedure that should be carried out, whether the transport services market is open to competition, what methodology to apply if the transport services market is not declared open to competition, whether the selection procedure should end with the signing of the contract between the city government and the operator, and other questions for which answers are sought.This paper presents an analysis of practices and proposed guidelines for the development and application of the bid operator ranking model in the public selection process.

Digitization of mobility services in urban areas made it possible to increase the efficiency of existing public transport services and create a new approach to mobility-as-a-service (shared ride, vehicle sharing, on-demand service, etc.). This gives users new opportunities to access information, plan trips and pay for transportation services. On the other hand, it creates new challenges for users who do not have access to digital technologies or do not have the necessary knowledge and skills to use them. For the development of sustainable urban mobility, it is necessary to ensure the availability of public transport services to all categories of users and provide intuitive interfaces for easier access and use of digitized mobility services. Digitization in the field of mobility must be implemented as part of the broader concept of developing the digital environment of a smart city. Digital technologies support changes in user access to mobility services by encouraging a new approach to mobility-as-a-service that includes service sharing and vehicle sharing with less use of personal vehicles. The overall concept of mobility-as-a-service supports sustainable mobility in the urban area. When implementing the digitization process in the field of mobility, the willingness and limitations of users to accept and use new digital mobility services must be taken into account.

Digitization of transport requires the transformation of the transport system from a physical to a cybernetic physical system. Digitization of transport includes the application of information and communication technologies and artificial intelligence in the transport system. This leads to the transformation of transport processes, but also to a change in the behavior of users and their views on transport and transport services. This creates the conditions for the development of new services and new solutions in the transport system that enable more efficient, economical, safer and more environmentally friendly transport.

In the last 5 years, several projects have been initiated in Sarajevo Canton that are focused on strengthening the identity of the city, promoting and implementing the concept of urban mobility, green and smart city. The issue of energy efficiency is included in all projects and from that aspect, among other things, the improvement of the public city passenger transport service is observed. This paper analyzes the state of public urban transport from the energy aspect, the savings that are achieved, the methodology for calculating savings and the effects that would be achieved through the implementation of planned projects for the development and reorganization of public urban passenger transport.

This paper presents a model push on which to determine the flow rates vehicles per share on the basis of circular intersections recorded entries and exits of vehicles in the aisles. In addition it is possible to analyze the influence of individual flows at intersections capacity, and determine the number of vehicles at the intersection of routes in the knowledge of the number of vehicles leaving the intersection at the next exit. Count the number of vehicles it is easier to manually and by using new technologies. Model (MIKR) results in a longer or shorter period of time which gives both static and dynamic characteristics.

The transport of the tram system on a high capacity corridor in a narrow urban area with increasing demand has become limiting both in terms of capacity and in terms of quality improvement. In this sense, the tram system in Sarajevo, as the primary system of city passenger transport, for many years, requires improvement in order to meet demand. The lack of clear strategies and plans for improving the primary transport system results in interventions of short-term investments in the maintenance of the infrastructure and suprastructure of the classic tramway of outdated and abandoned technology. In this way, the system is brought into a state of very unreliable and unsafe work. On the other hand, it is obvious that the development of individual motorized traffic has led to the fact that the common route has worsened the quality and safety of driving. The paper presents basic guidelines and aspects for the transformation of the classical tram in Sarajevo to the Light Rail System that can reach the fast city railway with the quantity and quality of the offer.

As smart vehicles begin to roam the streets, new possibilities will emerge for large-scale data acquisition tasks necessary for proactive smart cities applications. Unlike mobile devices, smart vehicles carry powerful sensors and are highly mobile they can cover large areas and perform high quality sensing. The road infrastructure and the information and communication environment of the vehicle need to be adapted to take advantage of the capabilities of smart city functions. This requires a holistic approach to solving the problem of digitalization of transport in a smart city environment.