Probability of driver's state detection based on systolic blood pressure

We attempted to detect a typical driver's surprised state based on blood pressure using a driving simulator. The results show that the driver's systolic blood pressure after a child and a bicycle rushed out on the road is higher than that before child and bicycle rushed out, and these two data are statistically significant. This means that the systolic blood pressure became high when the bicycle rushed out, thus suggesting that the feeling of “traffic near-miss” (surprised) can be detected via blood pressure. In addition that, systolic blood pressure is more adequate index to detect driver's surprised state than LF/HF, which is generally used to detect or estimate driver's surprised state.