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Validating criticality for cyclist-vehicle interactions

Utesch, Fabian and Zhao, Min and Goos, Kristina and Saul, Hagen and Zhang, Meng and Fischer, Martin (2022) Validating criticality for cyclist-vehicle interactions. ICTTP7, 23.-25. Aug. 2022, Göteburg, Schweden.

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Official URL: https://www5.shocklogic.com/scripts/jmevent/programme.php?Client_Id=%27KONGRESS%27&Project_Id=%2720371%27&System_Id=1


Ten interactions between cyclists and vehicles at a high-traffic intersection in Braunschweig, Germany were investigated. Trajectories, speed and distances in between road users were measured based on recordings from a high-end stereo-video camera system. As objective measures minimum time to collision (TTC_min), minimum time to zebra (TTZ_min), time integrated TTC (TIT), time exposed TTC (TET), minimum predictive encroachment time (PrET_min), pedestrian risk index (PRI) and an in-house metric, the Amberlight Risk Index (ARI) were calculated. As subjective measures the video recordings were rated for risk by three experts and 126 volunteers in an online study. A correlation analysis reveals that subjective ratings of volunteers correlate strongly with TTC_min and the maximum ARI and moderately with TET, TIT, TTZ_min and PRI. The expert ratings correlate moderately with PrET_min and weakly with TET, TIT and PRI. There was only a weak correlation between the ratings of the experts and volunteers. The TTC metric family (TTC_min, TTZ_min, TET and TIT) had strong correlations with each other. Based on subjective video ratings by humans as criterion, this work shows that the minimum of the popular TTC together with the ARI are well suited to predict criticality for cyclist-vehicle interactions at intersections as perceived by volunteers. However, the human ratings did not always agree. More research is needed to investigate why and which subjective risk rating is suited best for a given situation.

Item URL in elib:https://elib.dlr.de/185775/
Document Type:Conference or Workshop Item (Speech)
Title:Validating criticality for cyclist-vehicle interactions
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Utesch, FabianUNSPECIFIEDhttps://orcid.org/0000-0003-3830-5777UNSPECIFIED
Saul, HagenUNSPECIFIEDhttps://orcid.org/0000-0001-6961-7883UNSPECIFIED
Fischer, MartinUNSPECIFIEDhttps://orcid.org/0000-0001-8435-4321UNSPECIFIED
Date:25 August 2022
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:vulnerable road users criticality metrics traffic safety
Event Title:ICTTP7
Event Location:Göteburg, Schweden
Event Type:international Conference
Event Dates:23.-25. Aug. 2022
Organizer:VTI und SAFER
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - NGC KoFiF (old)
Location: Berlin-Adlershof , Braunschweig
Institutes and Institutions:Institute of Transportation Systems
Institute of Transportation Systems > Cooperative Systems, BA
Institute of Transportation Systems > Verification and Validation, BS
Institute of Transportation Systems > Information Gathering and Modelling, BA
Institute of Transportation Systems > Design and Evaluation of Mobility Solutions, BA
Deposited By: Utesch, Fabian
Deposited On:02 Sep 2022 18:45
Last Modified:02 Sep 2022 18:45

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