Foot Manoeuvres and Workload of Driver on Mountainous Roads with Longitudinal Slopes

XU Jin, WANG Xu, WANG Can, SHAO Yi-ming, MA Zhao-you

China Journal of Highway and Transport ›› 2018, Vol. 31 ›› Issue (1) : 91-100.

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China Journal of Highway and Transport ›› 2018, Vol. 31 ›› Issue (1) : 91-100.

Foot Manoeuvres and Workload of Driver on Mountainous Roads with Longitudinal Slopes

  • XU Jin1,2, WANG Xu2, WANG Can2, SHAO Yi-ming2, MA Zhao-you3
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Abstract

To validate the correlation between vertical alignment parameters of mountainous roads and physiological signals of the driver, and clarity the mechanism of parameters of the sloped section affecting driver's workload, the vehicle driving test on three two-lane mountainous roads with longitudinal slopes were carried out. The geometric parameters of slopes, drivers' electrocardiogram as well as accelerator and brake pedal force under naturalistic driving habits were collected. The distribution of pedal force was obtained, and the effect of grade change on pedal force was analyzed based on the measured data. Then the correlation between pedal force and heart rate increase (H) were confirmed respectively for uphill and downhill sections, and the regression model of H as a function of pedal force was established. The mechanism of driver's workload on slopes was revealed from both physical and mental burden perspective. The results show that the mean and characteristics percentile of brake pedal force are higher than that of accelerator pedal force, and brake pedal force corresponding to the highest frequency of use is greater than the magnitude of the accelerator pedal force, which indicating greater physical load brought by pedal operation on downhill. Moreover, pedal force is positively correlated with H, and H is more relevant to the brake pedal force on downhill, indicating that the operation related to brake pedal on downhill, especially the steep downhill, is more prone to producing mental burden. Furthermore, when the pedal force exceeds a certain magnitude, some driver's H value becomes sensitive to the increase in pedal force. Last but not the least, after averaging the pedal force and H data of every subjects on each slope (eliminating individual differences of different drivers), the mean of H is more relevant to the mean of pedal force.

Key words

traffic engineering / mountainous highway / field driving test / driver workload / mountainous road with longitudinal slope / foot manoeuvre / pedal force / heart rate increase

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XU Jin, WANG Xu, WANG Can, SHAO Yi-ming, MA Zhao-you. Foot Manoeuvres and Workload of Driver on Mountainous Roads with Longitudinal Slopes[J]. China Journal of Highway and Transport, 2018, 31(1): 91-100

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