External human-machine interfaces (eHMIs) are solutions that may be used to convey the intent of an Automated Vehicle (AV) based on its anticipated path and actions. They may help to resolve ambiguity, for example in situations such as crosswalks where pedestrians and AVs interact, as well as increasing pedestrians' sense of trust in AVs generally. However, some research has suggested that eHMIs do not significantly impact road crossing decisions, and that the motion dynamics of a vehicle, such as visibly slowing and stopping as it approaches a crosswalk, are more important to convey intention.
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