COMPARISON OF CAPACITY MODELS OF DIFFERENT THEORETICAL SETTINGS ON THE EXAMPLE OF A SMALL CITY ROUNDABOUT IN THE CITY OF MOSTAR

U svijetu postoji veliki broj modela kapaciteta kružnih raskrižja koji su svrstani u tri ključne skupine: empirijski modeli, teoretski modeli i mikroskopski simulacijski modeli. U Bosni i Hercegovini i Republici Hrvatskoj ne postoji pravilnikom propisani model kapaciteta kružnih raskrižja. Teoretski modeli kapaciteta izvedeni su iz teorije prihvaćanja vremenskih praznina. Zbog određenih nedostataka teorije prihvaćanja vremenskih praznina Brilon i Wu uvode novi koncept za analizu kapaciteta nesemaforiziranih raskrižja, pa time i kružnih raskrižja, zasnovan na teoriji konflikata i teoriji repova (queuing theory). U ovom radu se analiziraju tri najčešće korištena modela kapaciteta kružnih raskrižja u svijetu (HCM, Akcelik, Brilon-Wu), s različitim teorijskim pozadinama, kako bi se usporedili s direktno mjerenim kapacitetom na terenu u lokalnim uvjetima u Bosni i Hercegovini i time uvidile razlike u rezultatima primjene.Many roundabout capacity models are present in the world and they are classified into three key groups: empirical models, theoretical models, and microscopic simulation models. In Bosnia and Herzegovina and the Republic of Croatia, there is no roundabout capacity model prescribed by a rulebook. Theoretical capacity models are derived from gap acceptance theory. Due to some deficiencies of gap acceptance theory, Brilon and Wu introduce a new concept for analyzing the capacity of unsignalized intersections, and thereby of roundabouts too, based on conflict theory and queuing theory. This paper analyzes three roundabout capacity models most commonly used in the world (HCM, Akcelik, Brilon-Wu), with different theoretical backgrounds, in order to compare them with directly measured capacity in the field in local conditions in Bosnia and Herzegovina and thus to see the differences in application results