Dario Babić

Accident severity levels and traffic signs interactions in state roads: a seemingly unrelated regression model in unbalanced panel data approach

This study intended to investigate the interactions between accident severity levels and traffic signs in state roads located in Croatia, and explore the correlation within accident severity levels and heterogeneity attributed to unobserved factors. The data from 410 state roads between 2012 and 2016 were collected from Traffic Accident Database System maintained by the Republic of Croatia Ministry of the Interior. To address the correlation and heterogeneity, a seemingly unrelated regression (SUR) model in unbalanced panel data approach was proposed, in which the seemingly unrelated model addressed the correlation of residuals, while the panel data model accommodated the heterogeneity due to unobserved factors. By comparing the pooled, fixed-effects and random-effects SUR models, the random-effects SUR model showed priority to the other two. Results revealed that (1) low visibility and the number of invalid traffic signs per km increased the accident rate of material damage, death or injured; (2) average speed limit exhibited a high accident rate of death or injured; (3) the number of mandatory signs was more likely to reduce the accident rate of material damage, while the number of warning signs was significant for accident rate of death or injured.

Evaluation of static and dynamic method for measuring retroreflection of road markings

Neodgovarajuce i slabo održavane oznake na kolniku smatraju se bitnim faktorom koji pridonosi nastanku prometnih nesreca. Upravo je zato nužno periodicki ocjenjivati stanje oznaka, sto podrazumijeva provođenje nekoliko razlicitih ispitivanja među kojima je najznacajnije ispitivanje koeficijenta retrorefleksije primjenom staticke ili dinamicke metode. Rezultati istraživanja pokazali su da dinamicka mjerna metoda daje cjelovitije i objektivnije rezultate kvalitete oznaka, dok je staticka metoda zbog svojih ogranicenja u određenoj mjeri nepouzdana.