Title Model predviđanja trajanja oznaka na kolniku Title (english) Road markings service life prediction model Author Dario Babić Mentor Anđelko Ščukanec (mentor)Committee member Goran Zovak (predsjednik povjerenstva)Committee member Anđelko Ščukanec (član povjerenstva)Committee member Stjepan Lakušić (član povjerenstva)Committee member Mario Šafran (član povjerenstva)Granter University of Zagreb Defense date and country 2018-01-24, Croatia Scientific / art field, TECHNICAL SCIENCES Universal decimal classificationUDC ) 656.1/.5 - Land transport Abstract Oznake na kolniku predstavljaju dio prometne signalizacije koji korištenjem i kombinacijom crta, natpisa i simbola oblikuje prometnu površinu te daje informacije vezane uz vizualno vođenje sudionika u prometu. Kako su oznake na kolniku u centralnom vidnom polju vozača, predstavljaju značajan element koji doprinosi sigurnosti prometa. Da bi oznake mogle izvršavati svoju funkciju i pridonijeti povećanju sigurnosti prometa, one moraju biti vidljive, posebno u uvjetima smanjene vidljivosti. Iz navedenih razloga vidljivost oznaka na kolniku predstavlja, za sigurnost cestovnoga prometa, njihovu najvažniju karakteristiku te se na temelju nje određuje ciklus održavanja odnosno obnavljanja oznaka na kolniku. U ovom su doktorskom radu razvijeni modeli za predviđanje trajanja oznaka na kolniku za tri najčešće korištena materijala, a to su: boje na bazi otapala, termoplastika te hladna strukturirana plastika. Istraživanje se temelji na podatcima koji su dobiveni mjerenjima vidljivosti odnosno retrorefleksije oznaka na kolniku primjenom suvremene dinamičke metode mjerenja retrorefleksije oznaka. Osim retrorefleksije, a s ciljem dobivanja točnih i preciznih modela, na temelju postojeće literature identificirani su relevantni čimbenici koji utječu na degradaciju retrorefleksije oznaka, a time i na njihovo trajanje. Ti su čimbenici sljedeći: starost i položaj oznake, prosječan godišnji dnevni promet, aktivnosti zimske službe i prosječno ograničenje brzine na cestama. Njihov je utjecaj na trajanje oznaka detaljno statistički analiziran. Istraživanje je ukupno obuhvatilo 115 oznaka koje su izvedene bojom na bazi otapala ukupne duljine 5 218 km, 30 termoplastičnih oznaka ukupne duljine 579 km te 30 oznaka koje su izvedene hladnom strukturiranom plastikom ukupne duljine 497,9 km. Na temelju statističke analize utjecaja pojedinih čimbenika na trajanje navedenih materijala za izvođenje oznaka na kolniku razvijeni su modeli predviđanja trajanja oznaka na kolniku. Razvijeni su modeli pokazali zadovoljavajuću točnost te ih se kao takve može učinkovito koristiti za optimizaciju aktivnosti održavanja oznaka na kolniku s ciljem povećanja cestovne sigurnosti i racionalizacije troškova održavanja.
Abstract (english) Road markings are part of traffic signalization that form the road surface by using and combining lines, signs and symbols and provide information concerning visual guidance to road users. Since they are positioned in the drivers’ central field of vision, road markings are an important element contributing to road safety. In order to perform their function and contribute to the increase of road safety, road markings have to be visible, especially under low visibility conditions. It is precisely for these reasons that road markings visibility represents their most important characteristic for road safety, based on which the cycle of maintenance or renewal of road markings is determined. In this doctoral thesis models have been developed to predict service life of road markings for three most frequently used materials: solventborne paint, thermoplastic and cold structural plastic. The research is based on the data obtained by measuring visibility, that is, retroreflection of road markings by means of a contemporary dynamic method for measuring road markings retroreflection. In addition to retroreflection and in order to obtain accurate and precise models, based on the existing literature, relevant factors have been identified that affect the degradation of road markings retroreflection and thus their service life. Such factors include: road marking age and position, average annual daily traffic, winter maintenance activities and average speed limit on the road. Their impact on the road markings service life has been statistically analysed in detail. The research comprised in total 115 road markings applied in solventborne paint in total length of 5 218 km, 30 thermoplastic road markings in total length of 579 km and 30 cold structural plastic road markings in total length of 497,9 km. Models for predicting the service life of road markings have been developed based on the statistical analysis of the impact of individual factors on the durability of the stated materials used for application of road markings. The developed models have shown a satisfactory accuracy and as such, they can be efficiently used to optimize road maintenance activities, ultimately aimed at increasing road safety and rationalize maintenance costs.
Keywords
oznake na kolniku
retrorefleksija
model trajanja
dinamičko ispitivanje
Keywords (english)
road markings
retroreflection
service life
dynamic measurement
Language croatian URN:NBN urn:nbn:hr:119:894415 Study programme Title: Technological systems in traffic and transport Type of resource Text Extent 151 str. ; 30 cm File origin Born digital Access conditions Open access Terms of use Created on 2018-03-09 13:14:58
