External interface-based autonomous vehicle-to-pedestrian (AV2P) communication will facilitate the interaction between autonomous vehicle (AV) and pedestrian in future urban traffic. However, there are still no designs of external interface that could be generally accepted nowadays. In this regard, more sufficient research should be conducted to understand pedestrian’s needs for the communication and explore the considerations for the external interface design. To investigate these issues in this work, two focus groups and a design study were conducted with 14 users (i.e., pedestrians) and 4 experienced designers, respectively. Based on the obtained results, the pedestrian-required communication information from the vehicle for the AV-pedestrian interaction were extracted and classified into the state of vehicle, the intention of vehicle, and the vehicle advice to pedestrians. A taxonomy of AV-pedestrian interaction situations was developed in accordance with the different situation features subsequently. Finally, considerations about the design of external AV2P communication interface were summarized. The results showed that the interface design should be made with consideration of specific situation features. It also revealed that the communication interface should be understandable, concise, salient, and unambiguous. Findings in this work is expected could serve as valuable design bases or principles for the development of interface-based AV2P communication in the future.

基于外部接口的自动驾驶车辆与行人（AV2P）通信将促进未来城市交通中自动驾驶车辆（AV）与行人之间的交互。但是，如今仍没有普遍接受的外部接口设计。在这方面，应进行更充分的研究，以了解行人对通信的需求，并探索外部接口设计的注意事项。为了调查这项工作中的这些问题，分别与14位用户（即行人）和4位经验丰富的设计师进行了两个焦点小组和一项设计研究。根据获得的结果，提取车辆中用于行人与人行互动的行人所需的通信信息，并将其分类为车辆状态，车辆意图，以及给行人的车辆建议。随后，根据不同的情景特征，开发了AV与行人交互情景的分类法。最后，总结了有关外部AV2P通信接口设计的注意事项。结果表明，应在考虑特定情况特征的情况下进行界面设计。它还表明，通信接口应易于理解，简洁，突出和明确。期望这项工作中的发现可以作为将来基于接口的AV2P通信开发的有价值的设计基础或原则。总结了有关外部AV2P通信接口设计的注意事项。结果表明，在进行界面设计时应考虑特定的情况特征。它还表明，通信接口应易于理解，简洁，突出和明确。期望这项工作中的发现可以作为将来基于接口的AV2P通信开发的有价值的设计基础或原则。总结了有关外部AV2P通信接口设计的注意事项。结果表明，应在考虑特定情况特征的情况下进行界面设计。它还表明，通信接口应易于理解，简洁，突出和明确。期望这项工作中的发现可以作为将来基于接口的AV2P通信开发的有价值的设计基础或原则。