Lane offset behavior and free driving trajectory model of hairpin curves of mountain roads

CHEN Ying; WANG Xiao-hui; ZHANG Xiao-bo; CHEN Hai-yuan; XU Jin; DU Zhi-gang

doi:10.19818/j.cnki.1671-1637.2022.04.029

Volume 22 Issue 4

Aug. 2022

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Article Navigation > Journal of Traffic and Transportation Engineering > 2022 > 22(4): 382-395

CHEN Ying, WANG Xiao-hui, ZHANG Xiao-bo, CHEN Hai-yuan, XU Jin, DU Zhi-gang. Lane offset behavior and free driving trajectory model of hairpin curves of mountain roads[J]. Journal of Traffic and Transportation Engineering, 2022, 22(4): 382-395. doi: 10.19818/j.cnki.1671-1637.2022.04.029

Citation:

CHEN Ying, WANG Xiao-hui, ZHANG Xiao-bo, CHEN Hai-yuan, XU Jin, DU Zhi-gang. Lane offset behavior and free driving trajectory model of hairpin curves of mountain roads[J]. Journal of Traffic and Transportation Engineering, 2022, 22(4): 382-395. doi: 10.19818/j.cnki.1671-1637.2022.04.029

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Lane offset behavior and free driving trajectory model of hairpin curves of mountain roads

doi: 10.19818/j.cnki.1671-1637.2022.04.029

1.
School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, Hubei, China
2.
China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China
3.
Chongqing Key Laboratory of "Human-Vehicle-Road" Cooperation and Safety for Mountain Complex Environment, Chongqing Jiaotong University, Chongqing 400074, China

Funds:

National Key Research and Development Program of China 2018YFB1600500

Scientific and Technological Research Project of China Railway Siyuan Survey and Design Group Co., Ltd. 2019K091-1

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Author Bio:
CHEN Ying(1996-), female, doctoral student, yingchen1108@qq.com

XU Jin(1977-), male, professor, PhD, yhnl_996699@163.com
Received Date: 2022-02-26
Available Online: 2022-10-08
Publish Date: 2022-08-25

Abstract

Abstract

A free driving track model was built to reveal the behavior of lane offset and the characteristics of vehicle tracks in hairpin curves of mountain roads. A real vehicle driving test was carried out on a complex mountainous linear road, and high-precision onboard equipment was used to collect vehicle track, speed, and offset data under natural driving conditions. By the relative position curves of the tracks, the free driving track patterns of left- and right-turning vehicles in the hairpin curves were defined. With the curve angle of 180° as the boundary, the fitting model of the relative position of a vehicle in a hairpin curve was constructed, and the calculation method of the free driving track based on the offset was designed. The model was verified by the examples of hairpin curves on other roads. Research results show that the left-turning vehicles in the hairpin curves have four track patterns, while the right-turning vehicles have three track patterns. The vehicle track has large offsets in the entrance, middle part, and exit of the hairpin curves, with an offset of more than 40%. As the opposite lane is occupied by vehicles, different offset features are presented for different track patterns. The distributions of speed and offset corresponding to different positions are discrete, and when the speed compensation is less than 6.5 km·h^-1, the driver can reduce speed loss in the hairpin curve by occupying the opposite lane. Among the track fitting models built on the basis of the lateral offset under different curve angles, the highest accuracy of the models can be achieved when the hairpin curve angle is about 180°, with the fitting precision for left-turning vehicles between 0.90-0.97 and that for right-turning vehicles between 0.65-0.97. When the hairpin curve angle is greater than 180°, the maximum fitting precision of the fitting models is 0.97, and can be observed in the case of right-turning vehicles. When the hairpin curve angle is less than 180°, the maximum fitting precision of the fitting models is 0.89, and can be observed in the left-turning case. Therefore, the proposed track model has strong applicability and can provide means and method for driving track prediction in hairpin curves of mountain roads.
- traffic safety,
- mountain road,
- hairpin curve,
- lane offset,
- track prediction,
- track model

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References(30)

References

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Lane offset behavior and free driving trajectory model of hairpin curves of mountain roads

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Lane offset behavior and free driving trajectory model of hairpin curves of mountain roads

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