Effects of Transition Curves and Superelevation on the Critical States of Truck Rollovers on Sharp Curves
Sharp curves are vulnerable sections for rollover accidents. This study was conducted to investigate the effects of transition curve and superelevation on the critical speed and critical braking distance of truck rollovers. Using different transition types (spiral, Bloss and Grabowski curve) and di...
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| Format: | Article |
| Language: | English |
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Riga Technical University Press
2024-03-01
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| Series: | The Baltic Journal of Road and Bridge Engineering |
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| Online Access: | https://bjrbe-journals.rtu.lv/bjrbe/article/view/689 |
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| author | Junxian Chen Yonggang Wang |
| author_facet | Junxian Chen Yonggang Wang |
| author_sort | Junxian Chen |
| collection | DOAJ |
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Sharp curves are vulnerable sections for rollover accidents. This study was conducted to investigate the effects of transition curve and superelevation on the critical speed and critical braking distance of truck rollovers. Using different transition types (spiral, Bloss and Grabowski curve) and different superelevation values (6%, 120 m transition length and 8%, 160 m) as variables, experiments of constant speed driving and hard braking were simulated and conducted by Trucksim. Conclusions regarding the influence of these road design factors on the stability of vehicles were then proposed. Grabowski curve allowed for the maximum critical rollover speed. The difference in critical rollover speed between different transition types was only determined by the length of the transition section. Simply extending the length of the transition section increased the critical rollover speed of spiral curve, at the same time decreasing the critical speed of Bloss and Grabowski curve. Hard braking experiments showed completely different characteristics. As the initial speed increased, only spiral curve became safer. Increasing superelevation made the braking behaviour of the vehicle more dangerous and fraught with uncertainties due to different target speed, starting curvature and changing superelevation. Based on these findings, a number of useful recommendations for drivers and road designers were put forward.
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| format | Article |
| id | doaj-art-532e2cc3695f464ebf8aee0a94737eb2 |
| institution | Kabale University |
| issn | 1822-427X 1822-4288 |
| language | English |
| publishDate | 2024-03-01 |
| publisher | Riga Technical University Press |
| record_format | Article |
| series | The Baltic Journal of Road and Bridge Engineering |
| spelling | doaj-art-532e2cc3695f464ebf8aee0a94737eb22025-01-02T22:10:36ZengRiga Technical University PressThe Baltic Journal of Road and Bridge Engineering1822-427X1822-42882024-03-0119110.7250/bjrbe.2024-19.627Effects of Transition Curves and Superelevation on the Critical States of Truck Rollovers on Sharp CurvesJunxian Chen0https://orcid.org/0000-0002-2025-963XYonggang Wang1https://orcid.org/0000-0002-9365-1851School of Transportation Engineering, Chang’an University, Xi’an 710064, ChinaSchool of Transportation Engineering, Chang’an University, Xi’an 710064, China; Key Laboratory of Transport Industry of Management, Control and Cycle Repair Technology for Traffic Network Facilities in Ecological Security Barrier Area, Chang’an University, Xi’an 710064, China Sharp curves are vulnerable sections for rollover accidents. This study was conducted to investigate the effects of transition curve and superelevation on the critical speed and critical braking distance of truck rollovers. Using different transition types (spiral, Bloss and Grabowski curve) and different superelevation values (6%, 120 m transition length and 8%, 160 m) as variables, experiments of constant speed driving and hard braking were simulated and conducted by Trucksim. Conclusions regarding the influence of these road design factors on the stability of vehicles were then proposed. Grabowski curve allowed for the maximum critical rollover speed. The difference in critical rollover speed between different transition types was only determined by the length of the transition section. Simply extending the length of the transition section increased the critical rollover speed of spiral curve, at the same time decreasing the critical speed of Bloss and Grabowski curve. Hard braking experiments showed completely different characteristics. As the initial speed increased, only spiral curve became safer. Increasing superelevation made the braking behaviour of the vehicle more dangerous and fraught with uncertainties due to different target speed, starting curvature and changing superelevation. Based on these findings, a number of useful recommendations for drivers and road designers were put forward. https://bjrbe-journals.rtu.lv/bjrbe/article/view/689driving stabilityrolloversuperelevationtransition curvetraffic safety |
| spellingShingle | Junxian Chen Yonggang Wang Effects of Transition Curves and Superelevation on the Critical States of Truck Rollovers on Sharp Curves The Baltic Journal of Road and Bridge Engineering driving stability rollover superelevation transition curve traffic safety |
| title | Effects of Transition Curves and Superelevation on the Critical States of Truck Rollovers on Sharp Curves |
| title_full | Effects of Transition Curves and Superelevation on the Critical States of Truck Rollovers on Sharp Curves |
| title_fullStr | Effects of Transition Curves and Superelevation on the Critical States of Truck Rollovers on Sharp Curves |
| title_full_unstemmed | Effects of Transition Curves and Superelevation on the Critical States of Truck Rollovers on Sharp Curves |
| title_short | Effects of Transition Curves and Superelevation on the Critical States of Truck Rollovers on Sharp Curves |
| title_sort | effects of transition curves and superelevation on the critical states of truck rollovers on sharp curves |
| topic | driving stability rollover superelevation transition curve traffic safety |
| url | https://bjrbe-journals.rtu.lv/bjrbe/article/view/689 |
| work_keys_str_mv | AT junxianchen effectsoftransitioncurvesandsuperelevationonthecriticalstatesoftruckrolloversonsharpcurves AT yonggangwang effectsoftransitioncurvesandsuperelevationonthecriticalstatesoftruckrolloversonsharpcurves |