Marko Slavulj

Analysis of public transport service improvements on tram network in the City of Zagreb

Original scientific paper As a mass transit mode, public transport represents the backbone of sustainable urban mobility in highly-populated cities. In order to achieve modal shift from private car to public transport among city trips, transit service has to be attractive for passengers. In this manner, the operating speed, which highly depends on public transport priority, becomes an important indicator of public transport attractiveness. The tram priority research conducted in this paper is based on the available public transport data for the tram network of the City of Zagreb, such that two hypothetical tram priority scenarios were set. The results, in form of operating speed increase and savings in passenger spaces, show the possibilities for improvements while the operating capacity remains the same; all this is impacting the passenger travel time and costs for the operator as well as the local community of the City of Zagreb.

Analysis of the Possible Savings of Cycle Time on Tram Line No. 17 in Zagreb

The cycle time on tram line T is theoretically defined as a sum of the total operating (travel) time on line To and the total time at terminals tt. In order to ensure the increasing of the operating and cycle speeds of trams in Zagreb, as well as increasing the gross transport work of a single line with the same number of trams and drivers in one shift, this paper has explored a scenario for simulating cycle time savings by reducing the total operating time, both achieved by the possible implementation of tram priority via traffic lights based on the local automation. Possible realistic saving of the total operating time ΔTo on line No. 17 in Zagreb is based on the assumption that all signals at the traffic lights for trams should be green due to tram priority via traffic lights. Real operating time savings ΔTo was measured by using the stopwatch - pencil - record list method. The measurements were conducted in the middle shift during the afternoon peak load, as well as in the early shift during the morning peak load, for all of the seven days in one week, and for the new tram NT 2200 which accounts for 51% of the ZET tram fleet, on line No. 17. This paper has explored the ideal and maximum positive cycle time scenario, based on the measurement of possible maximum operating time savings ΔTo as the sum of the duration of all red signals at traffic lights for trams in one cycle in real traffic situations in Zagreb.

Restructuring models for road traffic inspections in Republic of Croatia

The scope of activities of Road traffic inspection in Croatia was increased significantly by the accession to the European Union, primarily due to control of application of social legislation in road transport that regulates working time of mobile workers, the area of the tachographs and tachograph workshops and issuing of memory cards for drivers, service technicians and transporters. The question is whether the Road traffic inspection in the Republic of Croatia is organized in the right way and whether the existing organization and the functioning can fulfil all the set tasks. Therefore, this paper proposes application of scientific methods for analysing of models for possible restructuring of Road traffic inspection in Republic of Croatia, advantages and disadvantages of the proposed models and the possibility of further improvement of this service.