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- ItemPortable Telematic System as an Effective Traffic Flow Management in Workzones(Transport and Telecommunication Institute, 2015-04-18) Ščerba, Marek; Apeltauer, Tomáš; Apeltauer, JiříTraffic infrastructure localities with temporal restrictions for example due to reconstructions, or modernization, are important aspects influencing the traffic safety and traffic flow. On the basis of our research, we can identify main factors, which generate travel time loses, and which often cause traffic accidents in bottlenecks. First of all, it is improper late merge, speeding, tailgating, lower tolerance and consideration to other road users. Nervousness and ignorance of drivers also play an important role in generation of traffic congestions, lower level of service and resulting external economic loses. One of the tools eliminating the traffic restriction negative impacts is usage of portable telematics systems. In 2011 to 2013,project ViaZONE was in progress, which was to design an intelligent system with the aim to eliminate the mentioned risks and reduce economic losses generated by traffic congestions. Using available data and information, we have proved profitability and cost-effectiveness of dynamic systems for traffic control of work zones. Regarding traffic management, the system showed some problems due to indisciplined drivers and the system proved that speeding in these hazardous road segments is a common practice which caused accidents and congestions.
- ItemUrban Commuting and Daytime Population In Small Areas of a Metropolis: A Case Study of Brno, Czech Republic(University of Zagreb, Faculty of Transport and Traffic Sciences, 2009-06-18) Akkerman, Abraham; Kudrna, Jan; Apeltauer, TomášA simplified modelling approach to urban commuting patterns is achieved by focusing on daytime populations ratherthan on commuters, or on the commuting process itself.
- ItemThe Effect of Compaction Degree and Binder Content on Performance Properties of Asphalt Mixtures(Vilnius Gediminas Technical University, 2016-09-16) Hýzl, Petr; Dašek, Ondřej; Varaus, Michal; Stehlík, Dušan; Coufalík, Pavel; Dašková, Jaroslava; Coufalíková, Iva; Nekulová, PavlaThe effect of compaction degree and binder content on performance properties of asphalt mixtures of an asphalt concrete type for wearing and binder courses are described in the paper. Measurements of stiffness modulus by two-point bending test on trapezoidal shaped specimens, fatigue characteristics, and resistance against frost cracking by thermal stress restrained specimen test have been performed on selected asphalt mixtures. The main aim of the experimental part was to determine to what extent the performance properties of the individual mixtures will be affected when decreasing the compaction degree by 3% in comparison to the optimal design, i.e. from 100% to 97% degree of compaction.
- ItemAsphalt mixtures with a high amount of RAP – case study(IOP Publishing, 2017-11-15) Koudelka, Tomáš; Varaus, MichalA case study of one trial section in the Pilsen region is presented. The pavement in the section was newly constructed in 2015 using one type of an asphalt concrete mixtures with varying RAP content. The constructed surface course comprises of 0% to 50% RAP. In order to restore the aged binder properties and to avoid the embrittlement of the produced mixtures, a rubber-based modifier/rejuvenator was employed. For technological reasons during manufacturing processes, which engage a parallel drying drum, a crude oil-based rejuvenator was also added. This article contains the preliminary data from an on-going project focused on monitoring the properties of bituminous binders contained in asphalt mixtures.
- ItemUsage of foamed bitumen in asphalt mixtures(Growing Science Ltd., 2020-05-08) Hýzl, Petr; Dašek, Ondřej; Stehlík, DušanThis paper focuses on the application of foamed bitumen technology in the production of asphalt mixtures. This technology replaces the common asphalt binder with foamed bitumen for production of asphalt mixtures. Given the foaming, it is possible to produce asphalt mixture at a lower working temperature.