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With regard to the prevention of traffic accidents, driver support systems adaptive to the operational ability of an individual driver are necessary. Driving ability depends on internal factors of the driver such as mental tension. The aim of this study was to develop an estimation system for the driver's state of tension. For real time estimation of mental tension, driver steering operation and head motion were examined as indices of tension adaptiveness. It was confirmed that steering operation and head motion were complementary indices, and both correlated with the reaction time of a driver during driving tasks in simulated driving conditions.

Estimation of Driver's State of Tension