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With the introduction of vehicular digitization and automation, there has been significant growth in the number of Electronic Control Units (ECUs) inside vehicles, followed by the broader use of Advanced Driver Assistance Systems (ADAS) and Automated Driving Systems (ADSs). The growth of the number of ECUs has also significantly increased the number of user interfaces. To conduct safe driving, in addition to those related to the real-time control of the vehicle, a driver also needs to be able to digest information effectively and efficiently from various ECUs via the Human-Machine Interface (HMI). To evaluate the safety of ADS, including its interactions with system users, some work has suggested that they will need to be driven for over 11 billion miles. However, the number of test miles driven is not a meaningful metric for judging safety. Instead, the types of scenarios encountered by the driver-vehicle interactions during testing are critically important.