The detailed procedure of the experiments are shown as below.
1) Before the test, we inform the participants the following items.
2) Two participants have few test rounds till they are familiar with the simulator and the dynamic performance of the vehicles. 3) After enough practice, driver B chooses to drive in autonomous mode or fully manual mode. If Driver B chooses autonomous mode. She or he also generates random driving style parameter (\(\alpha_{th}\)). Driver A cannot see this process. 4) Driver B initiates one test and before the start of the test, Driver B informs Driver A so that Driver A can be well prepared for the experiment. 5) Complete one test. 6) Fill in a questionnaire. 7) Repeat step 3) to 6) nine more times. 8) score the entire experiment using Table in Note S7, Supporting Information. 9) After one set of tests, Driver B will be asked what is the criteria for their judgments.