Cherin Lim - Hyundai NGV: Voice User Interaction Optimization for Autonomous Driving UX

Hyundai Next Generation Vehicle:

Voice User Interface Optimization for Autonomous Driving UX

Identify usability issues in the existing Avante's VUI
Design the VUI flow and uncover use cases for autonomous driving mode
Derive VUI & GUI design guidelines considering the transition from semi-autonomous to fully-autonomous driving
Prototype enhanced VUI and the corresponding GUI

*Prototype unavailable for public dissemination

VUI Guidelines

For simple tasks, use implicit confirmations instead of explicit ones, and limit the number of turn units to no more than two.
For complex tasks, present concise questions to guide users in making comparisons and selections effectively
When providing narrowing-down questions, ensure options are offered selectively and avoid presenting all available choices at once
In error scenarios, include explanations of the error and provide examples of corrective utterances to guide users toward resolution

GUI Guidelines

Design results of conversation depth (e.g., question – exploration – outcome) to be visually clear, ensuring that users do not lose their way in the process
Provide visual cues , such as chips, for follow-up questions or available functionalities at each stage of the interaction to enhance guidance
Facilitate visual exploration by offering appropriate menu layouts (e.g., lists, grids) and image-based information tailored to different types of information searches

Significant improvements in usability compared to the AVNT's existing VUI system

Evidenced by user feedback and quantitative metrics
Statistically significant effects of revised VUI on usability, task completion time, cognitive load, and satisfaction (p < 0.001)
Turn units/complexity decreased by 37%