Branimir C. Stanic

Design and evaluation of a grade-separated intersection: a case study of the proposed Belgrade ‘Hipodrom’

This paper presents the evaluation results of three traffic solutions for the complex grade-separated intersection located in the old part of Belgrade at the junction with the new bridge over the Sava River. The corridor to which the intersection belongs together with the new river bridge are parts of a great urban artery called the Inner Half Semi-Ring Road (IHSRR). The traffic solutions that are evaluated are defined in the preliminary design phase, based on two opposed concepts: a complete grade separation of all intersection legs (the CPV alternative – ‘grade-separated’) and a grade separation designed to minimise construction costs (DMC 1 and 2 alternatives – ‘minimise cost’). The evaluation procedure is conducted in three steps: first, the score based on expert assessment of the functionality of the design solutions is determined; second, the alternatives are ranked according to the value of a set of state indicators obtained by micro-simulation using PTV–VISSIM 4.10; and third, the final score is obtained by multi-criteria evaluation using the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method. The results of the first evaluation step show a small advantage for DMC 2, a sub-alternative of the DMC 1 alternative. The results of the micro-simulation give advantage to the DMC 1 alternative. The multi-criteria evaluation provides a better ‘goodness factor’ for the CPV alternative against the DMC 1 alternative. At the same time, the least construction cost favours alternative DMC 1.

New Street Scene for Pedestrians and Drivers

Abstract In the last twenty years all cities throughout the world have faced a continual increase in traffic demand. Neither a simple increase in physical capacities of the traffic network nor introduction of new traffic control systems nor similar isolated actions can be the right response to the increased traffic demands. New approaches to traffic management and application of complex new technological solutions in traffic control are called for. Besides improving safety for all participants, their main objectives are to increase the capacity of the existing infrastructure to enable its efficient exploitation in accordance with the current traffic demand and to protect urban environment from unnecessary traffic aggressive influence. It is clear that to achieve traffic flow the following issues should be taken into consideration: (1) Traffic conditions (to reduce duration and scope of traffic jams, to increase capacity and level of safety); (2) Physical surroundings (less noise and less pollution), and (...

New aesthetics of the city – design of cyclists traffic signs

Abstract In a number of towns and cities worldwide development programmes have been initiated to provide designated bike surfaces reserved for the movement of cyclists along city network. There has been an increase in the use of a bicycle as a regular means of personal transport, particularly in recent years when technical solutions and modern materials have allowed more active use of bicycles in big cities. Judging from the perspective of bicycles, Belgrade has undergone several significant changes. In the period preceding the Second World War the number of bicycles in the city (area of which used to be much smaller than today) was considerable, particularly in relation to vehicles. In the following periods, the development of the city has gradually pushed bicycles towards outskirts. Today bicycles are mostly used for recreation purposes. In this process special signalization addressed to cyclists has been mainly neglected. So‐called standard info‐solutions, essentially addressed to drivers, were applied...

Straight Lane Saturation Flow and Its Rate In Serbian Cities

Abstract Saturation flow is the base rate in the procedure for optimizing traffic signal operation and determining the measure for effectiveness of intersection operation. Different approaches and structures of analytical value models indicate the complexity of the problem of determining the saturation flow value in real conditions. This paper presents the synthesis of the results and conclusions of studying the saturation flow rate phenomenon at signalised intersections in Serbia in the last thirty years, by applying various survey techniques. The surveys relate to straight lane saturation flow value, in the survey conditions mostly resembling the idealised conditions in which saturation flow can be generated. The obtained results indicate that there is a significant trend of changes in the base saturation flow value compared with those first referred in 1963 by Webster and Cobbe, change in the significance of impact factor on saturation flow value, and the necessity to determine them on the local level.