This paper examines whether ecological speed information describing ongoing driving maneuvers during automated driving enhances the hedonic quality and driving safety immediately after a driving takeover. Visualizing maneuvers and trajectories has already proven effective. However, planned acceleration and deceleration in an automated vehicle have not yet been investigated. Therefore, this paper assesses how an automated vehicle’s speed control information might be presented by an ecological interface. Besides a possible increase in the hedonic quality, this information might enhance safe behavior of the human driver when it comes to a takeover. To assess these two aspects, 43 drivers participated in a dynamic driving simulator study. Using a within-subject design, two scenarios were used to compare an ecological interface, dynamically visualizing speed changes, to a conventional pop-up interface, using pop-up icons to visualize speed changes. The experimental results indicate that ecological feedback and conventional pop-up feedback do not differ regarding the hedonic quality, which was reflected by the state anxiety, usefulness, and satisfaction with the overall human-machine interface (HMI). Nonetheless, the post-hoc questionnaire on situational awareness showed a significantly lower rating for the ecological interface which may be the result of a more automatic and subconscious processing of the information given. Analyzing the takeover performance, the initial takeover time was comparably low for both interfaces. However, concerning safety, the ecological interface significantly enhanced the lateral control after takeover, and the drivers looked at the vehicle mirrors significantly earlier. In conclusion, the results show that the information given by the ecological interface may help drivers cope with a sudden takeover in a faster and more controlled way. Future applications of these findings might serve to enhance the acceptance and safety of semi-autonomous vehicles by implementing ecological interfaces.

本文研究了在驾驶接管后立即描述自动驾驶过程中正在进行的驾驶行为的生态速度信息是否可以提高享乐质量和驾驶安全性。可视化操作和轨迹已被证明是有效的。但是，尚未研究自动车辆中计划的加速和减速。因此，本文评估了生态界面如何显示自动驾驶汽车的速度控制信息。除了可能提高享乐质量外，此信息还可以增强驾驶员在进行接管时的安全行为。为了评估这两个方面，有43位驾驶员参加了动态驾驶模拟器研究。通过对象内部设计，使用了两种方案来比较生态界面，使用弹出图标来可视化速度变化，从而动态地可视化速度变化到传统的弹出界面。实验结果表明，生态享乐和常规弹出反馈在享乐质量方面没有差异，这反映在状态焦虑，有用性以及对整个人机界面（HMI）的满意程度上。尽管如此，事后意识状况的事后调查问卷显示，对生态界面的评价明显较低，这可能是对给定信息进行更自动和潜意识处理的结果。分析接管性能，两个接口的初始接管时间都比较短。但是，在安全性方面，生态界面显着增强了接管后的横向控制，司机很早就看了后视镜。总之，结果表明，生态界面提供的信息可以帮助驾驶员以更快，更可控的方式应对突然的接管。这些发现的未来应用可能会通过实现生态接口来提高半自动驾驶汽车的接受度和安全性。