3D UIs for AVs are an emerging and evolving field, and there are many open questions and issues that need to be addressed. How can we evaluate the effectiveness, usability, and acceptability of 3D UIs for AVs? What metrics, methods, and tools should be used to measure the user's behavior, performance, and experience? Additionally, how can we balance the trade-offs between the advantages and disadvantages of 3D UIs for AVs? What are the optimal levels of realism, complexity, and interactivity? How can we avoid potential drawbacks such as distraction, confusion, and motion sickness? Furthermore, how can we integrate and coordinate multiple modalities and dimensions of 3D UIs for AVs? How do we ensure consistency, coherence, and complementarity of visual, auditory, and haptic elements? And how can we adapt 3D UIs for AVs to the user's preferences, needs, and context?
Despite these questions and issues that need to be addressed, 3D UIs for AVs offer a promising opportunity to improve safety and user experience. By leveraging the user's natural abilities to perceive and interact with the 3D world, 3D UIs for AVs can create a more engaging, comfortable, and trustworthy relationship between the user and the vehicle.