Safety assessment of passing relief lanes using microsimulation-based conflicts analysis

Cafiso, Salvatore; D’Agostino, Carmelo; Kieć, Mariusz; Bąk, R.

doi:10.1016/j.aap.2017.07.001

Cited by 30 publications

(27 citation statements)

References 7 publications

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“…The development of the simulation model and calculation of simulated conflicts are described in detail in the [11,15]. To develop microsimulation model the empirical data was collected during field observations at 5 test sites on 2+1 road sections in Poland.…”

Section: Simulated Conflictsmentioning

confidence: 99%

“…Each 2+1 segment was surveyed for at least 2 hours (15 minutes was used as warm up time) with a high resolution camera placed at a distance of about 100 m to the starting of the merging area. This position was chosen based on the microsimulation results, which assess that mainly the conflicts are located in that part and only a negligible number of them are in other zone of the 2+1 segments [11]. As mentioned earlier the data gathering was made through video recordings in the different sections under investigation.…”

Section: Observed Conflictsmentioning

confidence: 99%

“…VISSIM) are post-processed. The application of microsimulated conflicts is considered as one of the methods based on surrogate measures which allows to estimate the number of conflicts for different road and traffic configurations [8][9][10][11][12]. Such an approach is much more popular in the analysis of intersections and, although simulation modeling for road sections with additional lanes is described in literature, these limited studies mainly discuss the modeling in the context of the evaluation of traffic performance [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…the ability to disperse traffic platoons and it may lead to hazardous manoeuvres like aggressive lane changing and increase in number of conflicts in the critical merging area at the end of the 2+1 section. Starting from microsimulation scenarios calibrated on operational parameters by Authors [15], the present research work deals with the validation of the simulated conflicts against observed conflicts. At this stage of the research the paper focuses mainly on the video recording and evaluation to get observed conflicts from digital image software analysis, vehicle tracking and algorithms to detect conflicts in real world 2+1 sections.…”

Section: Introductionmentioning

confidence: 99%

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Traffic conflicts analyses for 2+1 road sections

et al. 2018

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The additional passing lanes and 2+1 roads improve significant road safety. Studies indicate sections with additional passing lanes (relief or alternately), which may cause reduction in the number of accidents by 50%. However, how geometric design affects the safety performance of such sections is not in depth investigated. Previous studies are carried out with two approaches, i.e. the most often, based on analysis of observed crashes and more rarely by using microsimulation study. In the case of microsimulation research, traffic conflict theory can be applied as a surrogate measure of safety. One of the main problem in simulated conflicts study is the validation of simulation results against real world conditions. The aim of the paper is to assess the reliability of traffic conflict measures obtained by microsimulation against real world observation. Conflicts were detected and classified from video recording and analysis of vehicle trajectories in the merging area on 2+1 roads in Poland. Conducted studies focus only on lane changing conflicts, locations and TTCs values of observed conflicts between vehicles were primarily identified. Observed conflicts are than compared with microsimulated one, to assess if there is a correlation in the two.

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Section: Simulated Conflictsmentioning

confidence: 99%

Section: Observed Conflictsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Traffic conflicts analyses for 2+1 road sections

et al. 2018

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“…road class) and anticipated traffic [2][3][4]. Other safety measures are based on more indirect indicators, such as the estimation of the number of traffic conflicts, sometimes supported by microsimulation models [5][6][7][8]. We have observed the development of the National Traffic Management System on Polish expressways and motorways in recent years.…”

Section: Introductionmentioning

confidence: 99%

Methodology of research on the impact of ITS services on the safety and efficiency of road traffic using transport models

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The current assessment of the impact of Intelligent Transport System (ITS) services on the level of traffic safety and efficiency is based mainly on expert assessments, statistical surveys or several traffic safety models requiring development. There is no structured, uniform assessment method that would give the opportunity to compare the impact of ITS services and their different configurations. The paper presents the methodology for researching the effectiveness of ITS services implementation using transport models and key indicators allowing such an assessment. An approach was used in which the impact of ITS services is analysed using macro, meso and microscopic models. Macro and mesoscopic models allow estimation of the impact of ITS services on the efficiency of transport network operation and constitute the basis of analyses at the microscopic level, which takes into account the behaviour of drivers through the use of car following and lane change models. As part of the analyses, road network test models (for motorways and expressways along with an alternative route) were developed. Test models include road class, network topology, and different traffic intensity. The models were calibrated using real data (data from the traffic measurement station, data measured in the field, traffic distribution data from the VIATOLL charging system) and data from the vehicle simulator.

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