Abstract. Recently, negative trends towards the environment where the system of Mass Passenger Public Transport (MPPT) operates continue to grow. Mobility and citizens' standard of living are constantly increasing. A signifi cant increase in using private cars (level of motorization) along with all negative consequences faced under such circumstances as an increase in traffi c volume, congestions, a decrease in travelling speed, a higher number of traffi c accidents, greater negative infl uence on the environment etc. can be noticed. Th e city of Belgrade has recognized the signifi cance of continuous research and has monitored the quality of Mass Passenger Public Transport service as well as changes that are taking place in order to infl uence some specifi c parts of transport and traffi c policy in the city. Th is paper contains the benchmarking of results obtained in research and a trend towards changes in the expected and perceived quality of service (QoS) Keywords: mass passenger public transport, benchmarking, expected quality of service, perceived quality of service, quality indicators.

In this paper the influences of road and traffic conditions on fuel consumption and fuel costs of conventional diesel, parallel hybrid, and stoichiometric compressed natural gas buses in intercity bus service are analysed. Calculation of fuel consumption and fuel costs for these three different bus technologies was conducted for road network of the Republic of Serbia. Three scenarios were considered. The first scenario includes bus traffic volume carried out on the road network in 2014. The other two scenarios are characterized by the decrease i. e. increase of traffic volume by 20% with unchanged state of road infrastructure in comparison to the year 2014. Obtained results show that in intercity bus service the greatest influence on the fuel consumption of buses has operating speed of the bus, followed by terrain type on which buses operate. The impact of other factors (international roughness index, fluctuation of traffic volume by 20%, and correction factors of fuel consumption) is less pronounced. In various operating conditions the fuel cost savings per 100 km of compressed natural gas buses compared to diesel buses are in the range of €8.84-12.16. These cost saving for hybrid buses compared to diesel buses are in the range of €3.33-7.27.

This paper investigated the fuel effi ciency and ecological aspects of CNG (compressed natural gas) buses in urban public transport in Belgrade. For this study, CNG bus equipped with lean burn combustion and OCs (oxidation catalysts), and diesel bus with EGR (exhaust gas recirculation)-CRT (continuously regenerating technology) were tested on four urban public transport lines (55, 58, 74 and 94). Based on the recorded data regarding bus speed, acceleration, deceleration and mileage, for typical stop distance, driving cycle and its parameters is defi ned for urban public transport lines in Belgrade. Results of this study showed that under identical conditions on the same lines, average consumption of diesel bus was 12% higher than for tested CNG bus, but average energy consumption was 15.7% lower. Applying ''Student's t-test'' it has been determined that emission of NOX from tested CNG bus is lower than for diesel bus for 40%, CO2 for 21.6%, while emission of HC is higher more than ten times.

This paper presents a case study using Quality Function Deployment (QFD) method to identify urban public transport users’ needs and requests and to improve service quality in urban public passenger transport in Belgrade. In order to determine users’ satisfaction, a direct interview – survey a sample of 15000 of urban public passenger transport system users, according to the defined questionnaire has been performed. Results of these interviews are used as input in the first stage of QFD method. An overall unit of eight features and a total of 48 sub-features were defined, which describes all aspects of quality of system and services in urban public passenger transport. The results show that for maximizing effects of quality of service improvement and satisfying customers’ requirements, the public transport service providers and managers in Belgrade should focus primarily on the service reliability and vehicle elements. The two most important quality of service sub-features in urban public passenger transport system in Belgrade based on frequency of statements of users was regularity with 4896 (32.64%) and vehicle comfort (not crowded vehicles) with 3446 (22.97%) statements. Based on the service features analysis within the house of quality, it was defined that the biggest influence is generated through system functioning parameters (reliability): frequency with relative importance 22.0%, staff (drivers) with relative importance 14.0% and headway with relative importance 13.0%. Based on absolute importance the greatest importance should be assigned to vehicle frequency – rank 1, staff (drivers) – rank 2 and headway – rank 3.

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The paper contains a summary of results obtained when researching demand for transporting dangerous goods of class 3 (oil and oil derivates) in the area of the city of Belgrade in 2007. Considering all transport modes used for carrying oil and oil derivates (road, rail and water transport), we present the total quantities of transported goods on a percentage basis. In light of road transport, the paper presents the features of demand for transport in terms of time and space that are a basis for the management of transporting dangerous goods and input to defining transportation routes to dangerous goods. Among the features of demand for transport in terms of time, the paper presents the quantities of goods transported within different months of the year, different week days and different periods of the day. The features of demand for transport in terms of space presented in the paper are goods flow features depending on their origin and the destination of movement in relation to the defined serviced area and the load of traffic network with goods flows.

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