Vehicle platooning enables close-gap driving and offers potential benefits for traffic efficiency and safety. In conditionally automated platooning, drivers remain responsible for supervising the system and intervening when necessary, making effective Human-Machine Interfaces (HMIs) critical for maintaining situational awareness and stable driver-automation coordination. This paper investigates whether an in-vehicle HMI providing continuous system-state and inter-vehicle distance information improves supervisory behavior, safety, and platoon stability. We conducted a simulation-based experiment integrated with a 6-degree-of-freedom motion system to enhance scenario realism. Dependent variables included collision occurrence, response latency following platoon disconnection, and the number of manual interventions during intact platooning. Results showed significantly fewer manual interventions when the HMI was active, with intervention rates about 80% higher without it. No significant effects were found for collision occurrence or response latency, indicating that additional information improves supervisory stability during platooning but does not substantially affect emergency reactions or collision rates.

翻译：车辆编队行驶能够实现近距离跟车，并为交通效率与安全性带来潜在优势。在条件自动化编队行驶中，驾驶员仍需负责监控系统并在必要时进行干预，这使得有效的人机界面对维持情境意识及稳定的驾驶员-自动化协调至关重要。本文探讨了提供连续系统状态与车间距信息的车载人机界面，是否能提升驾驶员监控行为、安全性及编队稳定性。我们开展了一项基于仿真的实验，并集成了六自由度运动系统以增强场景真实感。因变量包括碰撞发生次数、编队断开后的响应延迟，以及编队完整行驶期间的手动干预次数。结果显示，在HMI激活时手动干预次数显著减少，无HMI时的干预率约高出80%。碰撞发生次数或响应延迟未发现显著影响，这表明额外信息能提升编队行驶中的监控稳定性，但不会显著影响紧急反应或碰撞率。