Abstract
Variation of driver workload degree on freeway was analyzed in order to research safe and comfort of alignment and provide a new technical support for humanization road design. A total of 12 healthy adult drivers heart rate variability index and operating speed are tested on 77 sections of one mountainous freeway. According to the change law of different drivers workload degree on different alignment conditions,4 sections cant meet the expectations of the truck drivers safe and comfort. In addition, accident data is used to verify the dangerous sections. Research results can be applied to design road alignment that meets the driving expectations of different drivers.
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