| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
This study examines the influence of road surface unevenness on the mental fatigue expressed by physiopsychological responses of humans by use of a sophisticated driving simulator. This study employs the following two physiopsychological measures: one is perceptional reaction time that refers to attentional resources for evaluating cognitive performance of humans, and heart rate variability indices that indicate mental stress corresponding to physiological changes in the autonomic nervous systems. As a result, both the long- and short- term mental stress increase when reaction time increases significantly proportional to the increase of surface roughness. This result indicates that surface roughness affects not only the ride comfort but also reduction of the safety by increasing reaction time with increasing mental fatigue. This study also provides the acceptable limit of the IRI for highways, which supports existing research results regarding roughness evaluation.
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