Investigation of driver mental load at entrance and exit of high density interchange group based on HRI
In order to clarify the correlation between the change of driver mental load and the driving environment at the entrances and exits of high-density interchange,tests on 47 drivers were conducted at four interchanges(three small clearance interchanges and one ordinary interchange)on the inner ring expressway in the main city of Chongqing.The heart rate increase(HRI)of drivers before and after passing the interchange diversion point and merging point was calculated by electrocardiogram(ECG)data continu-ously collected by physiological instrument,and the HRI was used as the mental load evaluation index to clarify the characteristics of drivers'mental load changes at the entrance and exit of the interchange.The mental load at the exit and entrance was compared,and the influence of environmental familiarity and diversion direction on the driver's mental load was analyzed.The results show that there are six patterns of changes in the HRI of drivers at the entrances and exits of small clearances interchanges,which is more diverse than the five patterns of changes at the entrances and exits of ordinary interchanges.Additionally,the mean values of the HRI at the exits and entrances of small clearances interchanges shows opposite trends,and the mean values and characteristic quar-tiles of the HRI shows that the HRI at the entrances are slightly higher than those at the exits;both merging and diverging behaviors causes significant fluctuations in the mental load of drivers.If the distance between interchanges is too short,it will lead to the increase of HRI and mental load when the driver passes through the exit and entrance of the interchange.The familiarity with the envi-ronment has a significant effect on the HRI of drivers passing through the exit and entrance merging points of the interchange,and the fluctuation of the HRI of drivers passing through the exit and entrance of the same interchange for the second and third time is sig-nificantly reduced.The HRI of drivers passing through the left side of the interchange is higher than that of the drivers passing the right side,indicating a greater mental load.
interchangehigh density interchangeinterchange groupheart rate increase(HRI)interchange entrance and exitdriving behaviormental load
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