{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T22:58:09Z","timestamp":1777417089483,"version":"3.51.4"},"reference-count":47,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2019,12,24]],"date-time":"2019-12-24T00:00:00Z","timestamp":1577145600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003246","name":"Nederlandse Organisatie voor Wetenschappelijk Onderzoek","doi-asserted-by":"publisher","award":["TTW 016.Vidi.178.047"],"award-info":[{"award-number":["TTW 016.Vidi.178.047"]}],"id":[{"id":"10.13039\/501100003246","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Information"],"abstract":"<jats:p>In the future, automated cars may feature external human\u2013machine interfaces (eHMIs) to communicate relevant information to other road users. However, it is currently unknown where on the car the eHMI should be placed. In this study, 61 participants each viewed 36 animations of cars with eHMIs on either the roof, windscreen, grill, above the wheels, or a projection on the road. The eHMI showed \u2018Waiting\u2019 combined with a walking symbol 1.2 s before the car started to slow down, or \u2018Driving\u2019 while the car continued driving. Participants had to press and hold the spacebar when they felt it safe to cross. Results showed that, averaged over the period when the car approached and slowed down, the roof, windscreen, and grill eHMIs yielded the best performance (i.e., the highest spacebar press time). The projection and wheels eHMIs scored relatively poorly, yet still better than no eHMI. The wheels eHMI received a relatively high percentage of spacebar presses when the car appeared from a corner, a situation in which the roof, windscreen, and grill eHMIs were out of view. Eye-tracking analyses showed that the projection yielded dispersed eye movements, as participants scanned back and forth between the projection and the car. It is concluded that eHMIs should be presented on multiple sides of the car. A projection on the road is visually effortful for pedestrians, as it causes them to divide their attention between the projection and the car itself.<\/jats:p>","DOI":"10.3390\/info11010013","type":"journal-article","created":{"date-parts":[[2019,12,24]],"date-time":"2019-12-24T10:28:43Z","timestamp":1577183323000},"page":"13","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":104,"title":["External Human\u2013Machine Interfaces: The Effect of Display Location on Crossing Intentions and Eye Movements"],"prefix":"10.3390","volume":"11","author":[{"given":"Y. B.","family":"Eisma","sequence":"first","affiliation":[{"name":"Department Cognitive Robotics, Delft University of Technology, Mekelweg, 2628 CD Delft, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"S.","family":"van Bergen","sequence":"additional","affiliation":[{"name":"Department Cognitive Robotics, Delft University of Technology, Mekelweg, 2628 CD Delft, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"S. M.","family":"ter Brake","sequence":"additional","affiliation":[{"name":"Department Cognitive Robotics, Delft University of Technology, Mekelweg, 2628 CD Delft, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M. T. T.","family":"Hensen","sequence":"additional","affiliation":[{"name":"Department Cognitive Robotics, Delft University of Technology, Mekelweg, 2628 CD Delft, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"W. J.","family":"Tempelaar","sequence":"additional","affiliation":[{"name":"Department Cognitive Robotics, Delft University of Technology, Mekelweg, 2628 CD Delft, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J. C. F.","family":"de Winter","sequence":"additional","affiliation":[{"name":"Department Cognitive Robotics, Delft University of Technology, Mekelweg, 2628 CD Delft, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2019,12,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"De Clercq, G.K., Dietrich, A., N\u00fa\u00f1ez Velasco, P., De Winter, J.C.F., and Happee, R. (2019). External human-machine interfaces on automated vehicles: Effects on pedestrian crossing decisions. Hum. Factors.","DOI":"10.1177\/0018720819836343"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"175","DOI":"10.1016\/j.trf.2019.10.013","article-title":"Survey on eHMI concepts: The effect of text, color, and perspective","volume":"67","author":"Bazilinskyy","year":"2019","journal-title":"Transp. Res. F Traffic Psychol. Behav."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Rasouli, A., and Tsotsos, J.K. (2019). Autonomous vehicles that interact with pedestrians: A survey of theory and practice. IEEE Trans. Intell. Transp. Syst, in press.","DOI":"10.1109\/TITS.2019.2901817"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"69","DOI":"10.1007\/s10111-018-0521-z","article-title":"Designing the interaction of automated vehicles with other traffic participants: Design considerations based on human needs and expectations","volume":"21","author":"Schieben","year":"2019","journal-title":"Cognit. Technol. Work"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1302","DOI":"10.1109\/TITS.2017.2749970","article-title":"The best rated human-machine interface design for autonomous vehicles in the 2016 Grand Cooperative Driving Challenge","volume":"19","author":"Benderius","year":"2018","journal-title":"IEEE Trans. Intell. Transp. Syst."},{"key":"ref_6","first-page":"650","article-title":"Evaluation of an autonomous vehicle external communication system concept: A survey study","volume":"Volume 597","author":"Stanton","year":"2017","journal-title":"Advances in Human Aspects of Transportation. AHFE 2017. Advances in Intelligent Systems and Computing"},{"key":"ref_7","unstructured":"Werner, A. (2018). New colours for autonomous driving: An evaluation of chromaticities for the external lighting equipment of autonomous vehicles. Colour Turn, 1."},{"key":"ref_8","unstructured":"Fridman, L., Mehler, B., Xia, L., Yang, Y., Facusse, L.Y., and Reimer, B. (2017). To walk or not to walk: Crowdsourced assessment of external vehicle-to-pedestrian displays. arXiv."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"272","DOI":"10.1016\/j.apergo.2018.11.002","article-title":"An experimental study to investigate design and assessment criteria: What is important for communication between pedestrians and automated vehicles?","volume":"75","author":"Ackermann","year":"2019","journal-title":"Appl. Ergon."},{"key":"ref_10","unstructured":"Nissan (2019, December 02). IDS Concept. Available online: https:\/\/www.nissan.co.uk\/experience-nissan\/concept-cars\/ids-concept.html."},{"key":"ref_11","unstructured":"Sweeney, M., Pilarski, T., Ross, W.P., and Liu, C. (2018). Light Output System for a Self-Driving Vehicle. (No. US9902311B2), U.S. Patent."},{"key":"ref_12","first-page":"515","article-title":"Crossing the street across the globe: A study on the effects of eHMI on pedestrians in the US, Germany and China","volume":"Volume 11596","year":"2019","journal-title":"HCI in Mobility, Transport, and Automotive Systems. HCII 2019. Lecture Notes in Computer Science"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Chang, C.M., Toda, K., Igarashi, T., Miyata, M., and Kobayashi, Y. (2018, January 23\u201325). A video-based study comparing communication modalities between an autonomous car and a pedestrian. Proceedings of the Adjunct Proceedings of the 10th International Conference on Automotive User Interfaces and Interactive Vehicular Applications, Toronto, ON, Canada.","DOI":"10.1145\/3239092.3265950"},{"key":"ref_14","unstructured":"Clamann, M., Aubert, M., and Cummings, M.L. (2017, January 8\u201312). Evaluation of vehicle-to-pedestrian communication displays for autonomous vehicles. Proceedings of the Transportation Research Board 96th Annual Meeting, Washington, DC, USA."},{"key":"ref_15","unstructured":"Daimler (2019, December 02). Autonomous Concept Car Smart Vision EQ Fortwo: Welcome to the Future of Car Sharing. Available online: https:\/\/media.daimler.com\/marsMediaSite\/en\/instance\/ko.xhtml?oid=29042725."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Ahram, T., Karwowski, W., Pickl, S., and Taiar, R. (2019). Displaying vehicle driving mode\u2014Effects on pedestrian behavior and perceived safety. International Conference on Human Systems Engineering and Design: Future Trends and Applications, Springer.","DOI":"10.1007\/978-3-030-27928-8"},{"key":"ref_17","unstructured":"De Waard, D., Brookhuis, K., Coelho, D., Fairclough, S., Manzey, D., Naumann, A., Onnasch, L., R\u00f6ttger, S., Toffetti, A., and Wiczorek, R. (Proceedings of the Human Factors and Ergonomics Society Europe Chapter 2018 Annual Conference, 2018). Designing for automated vehicle and pedestrian communication: Perspectives on eHMIs from older and younger persons, Proceedings of the Human Factors and Ergonomics Society Europe Chapter 2018 Annual Conference."},{"key":"ref_18","unstructured":"Semcon (2019, December 02). Who Sees You When the Car Drives Itself?. Available online: https:\/\/semcon.com\/smilingcar."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Karwowski, W., and Ahram, T. (2018). External HMIs and their effect on the interaction between pedestrians and automated vehicles. International Conference on Intelligent Human Systems Integration, Springer.","DOI":"10.1007\/978-3-319-73888-8"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.trf.2019.08.015","article-title":"Studying pedestrians\u2019 crossing behavior when interacting with automated vehicles using virtual reality","volume":"66","author":"Farah","year":"2019","journal-title":"Transp. Res. F Traffic Psychol. Behav."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Tom Dieck, M.C., and Jung, T. (2019). A tool, not a toy: Using virtual reality to evaluate the communication between autonomous vehicles and pedestrians. Augmented Reality and Virtual Reality, Springer.","DOI":"10.1007\/978-3-030-06246-0"},{"key":"ref_22","unstructured":"Toyota (2019, December 02). Concept-i. Available online: https:\/\/newsroom.toyota.eu\/2018-toyota-concept-i."},{"key":"ref_23","unstructured":"Deb, S., Strawderman, L.J., and Carruth, D.W. (2019, January 14\u201317). Should I cross? Evaluating interface options for autonomous vehicle and pedestrian interaction. Proceedings of the Road, Safety, and Simulation Conference, Iowa City, IA, USA."},{"key":"ref_24","unstructured":"Stanton, N. (2019). How should automated vehicles communicate?\u2013Effects of a light-based communication approach in a Wizard-of-Oz study. International Conference on Applied Human Factors and Ergonomics, Springer."},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Mahadevan, K., Somanath, S., and Sharlin, E. (2018, January 21\u201326). Communicating awareness and intent in autonomous vehicle-pedestrian interaction. Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems, Montreal, QC, Canada.","DOI":"10.1145\/3173574.3174003"},{"key":"ref_26","unstructured":"Vlakveld, W., Van der Kint, S., and Hagezieker, M.P. Cyclists\u2019 intentions to yield for automated cars at intersections when they have right of way: Results of an experiment using high-quality video animations, Submitted."},{"key":"ref_27","unstructured":"Drive.ai (2019, December 02). The Self-Driving Car Is Here. Available online: https:\/\/web.archive.org\/web\/20181025194248\/https:\/\/www.drive.ai\/#."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Colley, A., H\u00e4kkil\u00e4, J., Pfleging, B., and Alt, F. (2017, January 24\u201327). A design space for external displays on cars. Proceedings of the 9th International Conference on Automotive User Interfaces and Interactive Vehicular Applications Adjunct, Oldenburg, Germany.","DOI":"10.1145\/3131726.3131760"},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Colley, A., H\u00e4kkil\u00e4, J., Forsman, M.T., Pfleging, B., and Alt, F. (2018, January 6\u20138). Car exterior surface displays: Exploration in a real-world context. Proceedings of the 7th ACM International Symposium on Pervasive Displays, Munich, Germany.","DOI":"10.1145\/3205873.3205880"},{"key":"ref_30","unstructured":"Dietrich, A., Willrodt, J.-H., Wagner, K., and Bengler, K. (2018, January 5\u20137). Projection-based external human-machine interfaces\u2013Enabling interaction between automated vehicles and pedestrians. Proceedings of the Driving Simulation Conference Europe, Antibes, France."},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"L\u00f6cken, A., Wintersberger, P., Frison, A.K., and Riener, A. (2019, January 9\u201312). Investigating user requirements for communication between automated vehicles and vulnerable road users. Proceedings of the 2019 IEEE Intelligent Vehicles Symposium (IV\u201919), Paris, France.","DOI":"10.1109\/IVS.2019.8814027"},{"key":"ref_32","unstructured":"Mitsubishi Electric (2019, December 02). Mitsubishi Electric Introduces Road-Illuminating Directional Indicators. Available online: http:\/\/www.mitsubishielectric.com\/news\/2015\/1023.html."},{"key":"ref_33","unstructured":"Mercedes-Benz USA (2019, December 02). Mercedes-Benz F 015 Luxury in Motion. Available online: https:\/\/www.youtube.com\/watch?v=MaGb3570K1U."},{"key":"ref_34","first-page":"15","article-title":"The attentional demand of automobile driving","volume":"195","author":"Senders","year":"1967","journal-title":"Highw. Res. Rec."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"AlAdawy, D., Glazer, M., Terwilliger, J., Schmidt, H., Domeyer, J., Mehler, B., and Fridman, L. (2019, January 24\u201327). Eye contact between pedestrians and drivers. Proceedings of the Tenth International Driving Symposium on Human Factors in Driver Assessment, Training and Vehicle Design, Santa Fe, NM, USA.","DOI":"10.17077\/drivingassessment.1710"},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Dey, D., Walker, F., Martens, M., and Terken, J. (2019, January 22\u201325). Gaze patterns in pedestrian interaction with vehicles: Towards effective design of external human-machine interfaces for automated vehicles. Proceedings of the 11th International Conference on Automotive User Interfaces and Interactive Vehicular Applications, Utrecht, The Netherlands.","DOI":"10.1145\/3342197.3344523"},{"key":"ref_37","unstructured":"Bazilinskyy, P., Wesdorp, D., De Vlam, V., Hopmans, B., Visscher, J., Dodou, D., and De Winter, J.C.F. Visual scanning behaviour on a parking lot, In preparation."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"177","DOI":"10.1080\/1029843042000198586","article-title":"Effect of narrowing traffic lanes on pavement damage","volume":"4","author":"Liu","year":"2003","journal-title":"Int. J. Pavement Eng."},{"key":"ref_39","doi-asserted-by":"crossref","unstructured":"Cefkin, M., Zhang, J., Stayton, E., and Vinkhuyzen, E. (2019). Multi-methods research to examine external HMI for highly automated vehicles. International Conference on Human-Computer Interaction, Springer.","DOI":"10.1007\/978-3-030-22666-4_4"},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Troel-Madec, L., Alaimo, J., Boissieux, L., Chatagnon, S., Borkoswki, S., Spalanzani, A., and Vaufreydaz, D. (2019, January 10\u201313). eHMI positioning for autonomous vehicle\/pedestrians interaction. Proceedings of the IHM 2019\u201431e Conf\u00e9rence Francophone sur l\u2019Interaction Homme-Machine, Grenoble, France.","DOI":"10.1145\/3366551.3370340"},{"key":"ref_41","unstructured":"(2019, December 02). Ineos159challenge The Role of the Car. Available online: https:\/\/www.ineos159challenge.com\/news\/the-role-of-the-car\/."},{"key":"ref_42","unstructured":"De Waard, D., Brookhuis, K., Coelho, D., Fairclough, S., Manzey, D., Naumann, A., Onnasch, L., R\u00f6ttger, S., Toffetti, A., and Wiczorek, R. (Proceedings of the Human Factors and Ergonomics Society Europe Chapter 2018 Annual Conference, 2018). Cooperation through communication\u2013Using headlight technologies to improve traffic climate, Proceedings of the Human Factors and Ergonomics Society Europe Chapter 2018 Annual Conference."},{"key":"ref_43","unstructured":"Eisma, Y.B., Borst, C.B., Van Paassen, M.M., and De Winter, J.C.F. Augmented visual feedback: Cure or distraction?, Submitted."},{"key":"ref_44","doi-asserted-by":"crossref","unstructured":"Kooijman, L., Happee, R., and De Winter, J.C.F. (2019). How do eHMIs affect pedestrians\u2019 crossing behavior? A study using a head-mounted display combined with a motion suit. Information, 10.","DOI":"10.3390\/info10120386"},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Moore, D., Currano, R., Strack, G.E., and Sirkin, D. (2019, January 22\u201325). The case for implicit external human-machine interfaces for autonomous vehicles. Proceedings of the 11th International Conference on Automotive User Interfaces and Interactive Vehicular Applications, Utrecht, The Netherlands.","DOI":"10.1145\/3342197.3345320"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"817","DOI":"10.1037\/a0016127","article-title":"Spatial ability for STEM domains: Aligning over 50 years of cumulative psychological knowledge solidifies its importance","volume":"101","author":"Wai","year":"2009","journal-title":"J. Educ. Psychol."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1016\/S0301-0511(00)00052-1","article-title":"Aging and measures of processing speed","volume":"54","author":"Salthouse","year":"2000","journal-title":"Biol. Psychol."}],"container-title":["Information"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2078-2489\/11\/1\/13\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T13:45:10Z","timestamp":1760190310000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2078-2489\/11\/1\/13"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,12,24]]},"references-count":47,"journal-issue":{"issue":"1","published-online":{"date-parts":[[2020,1]]}},"alternative-id":["info11010013"],"URL":"https:\/\/doi.org\/10.3390\/info11010013","relation":{},"ISSN":["2078-2489"],"issn-type":[{"value":"2078-2489","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,12,24]]}}}