Original scientific paper The methodology that allows predicting the occurrence of traffic accidents on the motorway was studied and defined in this paper. On the basis of this assessment the implementation of active measures for reducing the probability of their actual occurrence is included. The intensity of traffic does not give a simple correlation with the number and the type of accidents, that relationship is more complex. Previous studies have been applied to motorways with six and more traffic lanes, and no studies have been carried out for four-lane motorways (with the driving and overtaking lane on one carriageway). This paper presents a new model for such motorways, the model is based on measuring values of parameters of traffic flow and external factors that affect the traffic flow. The degree of crash potential was brought to correlation with the existing statistical data on traffic accidents on the test section and traffic flow data. This model is important for experts to produce algorithms that manage variable message signs on highways. Keywords: crash potential factor; four-lane motorways; traffic flow; traffic safety management model; variable message signs Model stvarno-vremenskog upravljanja sigurnošću prometa na autocestamaIzvorni znanstveni članka U radu je istražena i definirana metodologija koja omogućuje predviđanje nastanka prometnih nesreća na autocesti. Na osnovu te procjene uključuje se provedba aktivnih mjera za smanjenje vjerojatnosti njihova stvarnog nastanka. Sam intenzitet prometa ne daje jednostavnu korelacijsku vezu s brojem i vrstom prometnih nesreća već je taj odnos mnogo složeniji. Dosadašnja istraživanja primjenjivana su za autoceste sa šest i više prometnih traka, odnosno nema istraživanja napravljenih za četverotračne autoceste. U radu je prikazan novi model za takve autoceste, a baziran je na mjerenju vrijednosti parametara prometnog toka te vanjskih čimbenika koji utječu na odvijanje prometnog toka. Stupanj opasnosti od nastanka nesreće doveden je u korelaciju s postojećim statističkim podacima o prometnim nesrećama na testnoj dionici i podataka o prometnom toku. Ovaj model značajan je za eksperte koji izrađuju algoritme koji upravljaju promjenjivim prometnim znakovima na autocestama.Ključne riječi: četverotračne autoceste; faktor opasnosti nastanka prometne nezgode; model upravljanja sigurnošću prometa; prometni tok; promjenljiva svjetlosna signalizacija
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