The main objective of this paper, based upon the extensive empirical research of free flow in local conditions, is to quantify the unfavourable impact of the flow structure on the road capacity using PCE (Passenger Car Equivalent) values as a function of longitudinal grade. Based on literature reviews and empirical research, it has been proved that the PCE value for all vehicle classes is directly correlated with the road gradient. The PCE values in free flow conditions have been determined for the approved vehicle classes. Based on the measured values, models for determining the average PCE value depending on the upward grade on two-lane roads have been developed. Comparison of the developed models in conditions of free traffic flow with the Highway Capacity Manual (HCM) models has shown lower PCE values in this research. Models for the percentage of PCE values PCE15%, PCE50% and PCE85% have also been established.

This paper analyzes the influence of heavy-duty vehicles (HDV) on the traffic capacity of a two-lane road depending on weather conditions. The influence of the heaviest vehicles moving is expressed by the passenger car equivalents – PCE. The research was performed in Bosnia and Herzegovina, on section M-17 of the highway that tangents (touches) the zone of the city of Doboj, where the values of PCE for heavy-duty vehicles were measured at three sections with interference of on ramps and off ramps. By determining the time headway, PCE factors and their influence on traffic capacity were analyzed. The research was done for three time headway variants PC-HDV, HDV-PC and HDV-HDV. Total measured PCE factors’ value on the highway for all three sections and all three variants is 1.584; while comparing this value with HCM-2010 (Highway Capacity Manual) (TRB, 2010) it is between 1.4 and 1.5 (progressively decreasing with flow) which presents substantial deviation. That is why mathematical models for determining PCE of heavy-duty vehicles of two-lane road were developed in function of number of the following vehicles on dry and wet roadway. Developed model for establishing the PCE is based on determining time headway, which could be used to determine PCE values for particular number of following vehicles without interruption.

Saobracajne sisteme u urbanim aglomeracijama karakterise niz negativnih efekata kao sto su zagusenje, opadanje nivoa kvaliteta usluge prevoza, snižavanje bezbednosti saobracaja, zagađenje vazduha, povecanja nivoa buke i narusavanje životne sredine. Ovi efekti su posebno izraženi u gradskim sredinama. Prema podacima Ujedinjenih Nacija u gradovima živi oko 50% svetskog stanovnistva, a ocekuje se da taj broj poraste na 61% do 2030. godine. Od donosioca odluka i kreatora politike urbanog transporta se ocekuje da uspostave strateski okvir i operativni model za resavanje problema narastajuce mobilnosti i degradacije životne sredine. Savremeni pristupi u resavanju navedenih problema mogu se naci u principima održivog transporta, koji se razvio kao deo strategije održivog razvoja. Ovaj rad, ima za cilj definisanje modela kampanje odnosa sa javnoscu za promovisanje održivih vidova urbanog transporta. U radu je najpre predstavljen i analiziran primer iz prakse, međunarodna kampanja „Dan bez automobila“, a zatim je prikazan jedan pristup definisanju u sprovođenju kampanje za podizanje svesti o važnosti promene „saobracajnih navika“ i njihovom doprinosu ocuvanju životne sredine u gradovima. Posebna pažnja je posvecena promovisanju koriscenja javnog gradskog prevoza, bicikala, kao i pesacenja umesto putnickih automobila. Takođe, u radu su predstavljeni rezultati istraživanja poznavanja karakteristika održivog transporta, koji predstavljaju osnovu za izbor adekvatne strategije u cilju efikasnog promovisanja održive mobilnosti u jedinici lokalne samouprave.

The biggest wealth of every country lies in its transportation infrastructure so the protection of negative impacts on infrastructure must be provided. The progress of sensor technology proposes today several types of weigh-in-motion systems, which have been tested for their efficiency, accuracy and cost-effectiveness. Technologies of piezoelectric sensors, bending plates and load cells are used for a number of applications comprising weigh enforcement, traffic data collection, bridge and toll control systems and so on. Advantages of using WIM technology are various and its benefits affects all road users (transport companies, public, public transport authorities). Potential of WIM application has been recognized in the leading EU countries, so the existence of the numerous WIM projects.

Traffic rate increase results in a number of negative effectstraffic congestion, deterioration of transport service quality, a decrease in traffic safety, air pollution, higher noise exposure and damaging the environment.Over the past twenty years the number of car drivers and traffic levels have increased in all large cities. These factors directly or indirectly affect the quality of life of the inhabitants of large cities. A decision maker and the creator of the urban transport policy are expected to set a strategic framework and an operational model for solving the issues of growing mobility and living environment degradation. Modern approaches in solving the above mentioned issues can be found in the principles of sustainable transport, which evolved as a part of the strategy of sustainable development. The reduction of the use of motor vehicles is realized by taking “soft measures“, such as: making use of various forms of communication, announcing, advertizing and education aiming at altered attitude and behaviour in traffic.The impact of the campaigns on sustainable transport management in urban agglomerations was presented in this paper. Keywords-Sustainable development, Sustainable transport, Campaign