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Abstract

Safety Performance Functions and Crash Modification Factors are statistically-based prediction methods that require significant efforts and long periods in crash data collection. Traffic conflict studies can mitigate this issue using a short time survey to measure the number and severity of traffic conflicts, which are regarded as surrogate safety measures. Unfortunately, they are empirical studies that can be carried out only after the implementation of a treatment. The overall objective of the present research is to investigate the performance of different methods for conflict detection and classification, considering the observed conflicts on 2+1 roads in Poland. Observations were compared with conflicts detected in simulated environments. The latter include either the Agent-Based Microsimulation (ABM) approach, or the virtual reality simulation using a Driving Simulator (DS). Conflicts were detected and classified based on video recording and analysis of vehicle trajectories in the merging area of 2+1 roads. The studies focused only on lane-changing conflicts. Locations, Post Encroachment Time and Time to Collision values of observed conflicts between vehicles were subsequently identified. Observed conflicts were compared with the ones resulting from ABM and DS, to determine whether there is a correlation between them.
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Authors and Affiliations

Salvatore Cafiso
1
ORCID: ORCID
Alessandro Calvi
2
Carmelo D'Agostino
3
Mariusz Kieć
4
Gianmarco Petrucci
5
Piotr Szagała
6

  1. University of Catania, Department of Civil Engineering & Architecture, Via Santa Sofia 64, I-95125 Catania, Italy
  2. Roma Tre University, Department of Engineering, Via Vito Volterra 62, I-00146 Rome, Italy
  3. Lund University, Department of Technology and Society, John Ericssons väg 1, 223 63 Lund, Sweden
  4. Cracow University of Technology, Faculty of Civil Engineering, 24 Warszawska Str., 31-155 Cracow, Poland
  5. Donati S.p.A., via Aurelia Antica 272, I-00165 Rome, Italy
  6. Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland
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Abstract

Being negatively impressed by the data published by the European Commission in CARE (Community database on Accidents on the Roads in Europe), where Poland is presented as the European Country with the highest rate of fatalities in road crashes involving cyclists during 4 years period (2009–2013), the Authors decided to analyse available data. Bikes become a more and more popular means of transport and the way of active recreation. In Warsaw, the share of bicycle trips rises 1 to 3% per year. The aforementioned, together with increasing traffic density, caused 4233 registered injuries among cyclists in 2018 in Poland. In 286 cases the accidents were direct reasons for the cyclists’ death. Considering these facts, it becomes extremely important to point the most influencing factors and conditions contributing to cyclists’ serious accidents. Onedimensional or two-dimensional statistics are not sufficient to find all important associations between the road conditions and the number of cyclists’ accidents. To overcome that the association analysis is applied. The results of the analysis can contribute to increasing the knowledge and safety of transport.
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Bibliography


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Authors and Affiliations

Hubert Anysz
1
ORCID: ORCID
Paweł Włodarek
1
ORCID: ORCID
Piotr Olszewski
1
ORCID: ORCID
Salvatore Cafiso
2
ORCID: ORCID

  1. Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland
  2. University of Catania, Department of Civil Engineering and Architecture, Viale Andrea Doria 6, 95131 Catania, Italy

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