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One Solution Fits all? Evaluating Different Communication Strategies of a Light-based External Human-Machine Interface for Differently Sized Automated Vehicles from a Pedestrian’s Perspective

Lau, Merle and Jipp, Meike and Oehl, Michael (2022) One Solution Fits all? Evaluating Different Communication Strategies of a Light-based External Human-Machine Interface for Differently Sized Automated Vehicles from a Pedestrian’s Perspective. Accident Analysis and Prevention. Elsevier. doi: 10.1016/j.aap.2022.106641. ISSN 0001-4575.

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Abstract

Differently sized automated vehicles (AVs) will enter the roads of tomorrow and will interact with other road users. Pedestrians as vulnerable road users heavily rely on the communication with other road users, especially for the interaction with larger vehicles, as miscommunication pose a high risk. Therefore, AVs need to provide communication abilities to safely interact with pedestrians. This study’s focus was on the explicit communication which is highly relevant in low-speed and low-distance traffic scenarios to clarify misunderstandings before they result in accidents. External human-machine interfaces (eHMIs) placed on the outside of AVs can be used as a communication tool to explicitly inform the surrounding traffic environment. Although research manifested effects of vehicle size on pedestrians’ perceived safety and crossing behavior, little research about the eHMI design for differently sized AVs exists. This experimental online study (N = 155) aimed at investigating the application of a light-based eHMI on two differently sized AVs (car, bus) by focusing on the overall goal of ensuring traffic safety in future traffic. The light-based eHMI showed different communication strategies, i.e., a static eHMI and three dynamic eHMIs. The results revealed that an automated car was perceived as safer and affectively rated as more positive compared to an automated bus. Nevertheless, no significant differences were found between the two AVs in terms of the eHMI communication. A dynamic eHMI was perceived as safer and evaluated affectively as more positive compared to a static eHMI or no eHMI for both AVs. In conclusion, the use of a light-based eHMI had a positive effect on pedestrians’ interaction with an automated car and an automated bus and, therefore, could contribute to the overall traffic safety in this study. Implications for the design of eHMIs for differently sized AVs were discussed.

Item URL in elib:https://elib.dlr.de/186147/
Document Type:Article
Title:One Solution Fits all? Evaluating Different Communication Strategies of a Light-based External Human-Machine Interface for Differently Sized Automated Vehicles from a Pedestrian’s Perspective
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lau, MerleMerle.Lau (at) dlr.dehttps://orcid.org/0000-0003-4852-034X
Jipp, MeikeMeike.Jipp (at) dlr.deUNSPECIFIED
Oehl, MichaelMichael.Oehl (at) dlr.dehttps://orcid.org/0000-0002-0871-2286
Date:17 March 2022
Journal or Publication Title:Accident Analysis and Prevention
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.aap.2022.106641
Publisher:Elsevier
ISSN:0001-4575
Status:Published
Keywords:external human-machine interface; vulnerable road users; pedestrians; automated vehicles; vehicle size
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Zukunftsbilder eines automatisierten integrierten Verkehrssystems
Location: Braunschweig
Institutes and Institutions:Institute of Transportation Systems > Information Flow Modelling in Mobility Systems, BS
Institute of Transportation Systems > Cooperative Systems, BS
Institute of Transport Research > Leitungsbereich VF
Deposited By: Lau, Merle
Deposited On:20 Apr 2022 12:59
Last Modified:20 Apr 2022 12:59

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