Presently, we are conducting a research on a driver assistance system (DAS) for the purpose of reducing driver's workload. This system is comprised of two functions one of which is the lane keeping assistance system and the other is the adaptive cruise control system. It has became apparent from the result of our research conducted so far that DAS is capable of significantly reducing the driver's workload. Meanwhile with this type of assistance system, the designer can freely set the amount of assistance required. Naturally the amount of assistance has an important meaning and it conceivably has various effects on the driver's maneuverability. There is a number of researches being conducted on the cause and effect relationship between human and machine as a human factor study. However since the relationship between human and machine are entangled with complications, it is the fact that presently there is no clear solution to this matter DAS that we are currently developing also has a need to clear this problem if the system were to be broadly used by the drivers in the future. This paper reports a method and result of our quantitative analysis on how much the changes in the assist ratio of the lane keeping assistance have affect and effect on the driver by experiment conducted with actual vehicles on the freeways in Japan.
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