The Influence of Road Geometry on Vehicle Rollover and Skidding

Yin, Yanna; Wen, Huiying; Sun, Lu; Hou, Wei

doi:10.3390/ijerph17051648

Cited by 23 publications

(25 citation statements)

References 32 publications

(38 reference statements)

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“…ADAMS is a simulation software for predicting the mechanical system performance, collision detection, motion range, and peak load. The quality of the simulation in ADAMS is high, and the modeling is complex [ 6 ]. The road was modeled by classical equations for circle and clothoid (also known as spiral) curves.…”

Section: Methodsmentioning

confidence: 99%

“…Several studies indicate that most road accidents occur at horizontal curves [ 1 , 2 , 3 , 4 , 5 , 6 ]. At horizontal curves, the risk of accidents is significantly higher than that in other sections of the road [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…Some studies have estimated the safety of horizontal curves based on tire–pavement friction with the help of the ADAMS/Car (Automated Dynamic Analysis of Mechanical System) simulator and the safety margin theory [ 18 ]. Recent studies about the estimation of the safety margin have mainly focused on friction supply and friction demand on horizontal curves [ 6 , 10 , 15 , 16 , 19 , 20 , 21 ]. On the other hand, the use of the clothoid transition curve between the tangent and circular curve has been suggested to increase the safety margin against skidding, especially when superelevation exceeds 12% [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Safety in Horizontal Curves of Roads Using a Multi-Body Dynamic Simulation Process

Nasiri

Rahmani

Kordani

et al. 2020

IJERPH

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Road transportation poses one of the significant public health risks. Several contributors and factors strongly link public health and road safety. The design and advancement of higher-quality roads can significantly contribute to safer roads and save lives. In this article, the safety aspect of the roads’ horizontal curves under the standard of the American Association of State Highway Transportation Officials (AASHTO) is evaluated. Several factors, including vehicle weight, vehicle dimensions, longitudinal grades, and vehicle speed in the geometric design of the horizontal curves, are investigated through a multi-body dynamic simulation process. According to the AASHTO, a combination of simple circular and clothoid transition curves with various longitudinal upgrades and downgrades was designed. Three vehicles were used in this simulation, including a sedan, a bus, and a 3-axle truck. The analysis was based on the lateral friction between the tire and the pavement and also the safety margin parameter. The results showed that designers must differentiate between light and heavy vehicles, especially in curves with a high radius. Evaluation of longitudinal grade impacts indicated that the safety margin decreases when the vehicle is entering the curve. Safety margin reduction on the clothoid curve takes place with a lower grade toward the simple circular curve. By increasing the speed, the difference between lateral friction demand obtained from simulation and lateral friction demand proposed by AASHTO grows. The proposed novel methodology can be used for evaluating road safety.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Safety in Horizontal Curves of Roads Using a Multi-Body Dynamic Simulation Process

Nasiri

Rahmani

Kordani

et al. 2020

IJERPH

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“…Stages of I and II can be connected by two opposite curves of equal length. Based on the characteristics of the vehicle's driving track, the transition curve coincides with the track of the vehicle's centroid, and the minimum radius of the curve at the connection is the minimum turning radius of the vehicle at the given speed [33].…”

Section: Figure3 Schematic Of the Vehicle Lane Changing Trackmentioning

confidence: 99%

Modeling and Verification of the Length of the Entrance and Exit Sections of an Undersea Tunnel

et al. 2021

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At present, there is no standard or research to define the specific length of the entrance and exit sections of an undersea tunnel. In combination with the unique longitudinal slope of the undersea tunnel and the change in the illumination difference, the lengths of the lane change, transition and adaptation sections of the entrance and exit sections of the undersea tunnel were theoretically deduced, and a model for the entrance and exit sections lengths was established. Considering the Qingdao Jiaozhou Bay undersea tunnel as an experimental subject, the accuracy of the model of the entrance and exit section lengths was verified using two methods. The results indicated that the lengths of the entrance and exit sections of undersea tunnels change with changes in the factors such as the illumination, vehicle speed, and slope. In the case of the Qingdao Jiaozhou Bay undersea tunnel, when the vehicle passes the undersea tunnel at a speed of 70 km/h on a sunny day, according to the studied model, the entrance and exit sections of the undersea tunnel are 146.7 m and 157.1 m long, respectively. The entrance and exit section lengths of the undersea tunnel, determined using test method 1 and test method 2 are 151.0m, 153.6m and 161.0m, 148.9m, respectively. The absolute errors between the results of the model and test method 1 and 2 are less than 10%. These findings indicate that the model for the entrance and exit section lengths of undersea tunnels is reasonably accurate.

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“…The countries in these group have small number of vehicles used (less than 1% of worldwide). However, the number of deaths from road accidents is as high as 15% in these countries, unlike in high-income countries which possess as high as 40% of the world's vehicles but find less than 10% result in deaths [10], [11], [12], [13]. Therefore, it can be concluded that the income of the population affects the death rate from the road accident [14], [15].…”

Section: Introductionmentioning

confidence: 99%

Understanding of Development Emergency Medical Services in Laos Emergency Medicine Residents

Apiratwarakul

Çelebi

Tiamkao

et al. 2021

Open Access Maced J Med Sci

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BACKGROUND: Rising death tolls from traffic accidents are quickly becoming an inescapable problem in almost all countries around the world. That being said, the World Health Organization has launched an ambitious campaign aimed at reducing the death rate from traffic accidents by 50% in the next 10 years. Development of emergency medical services (EMSs) was the tool to success the goals, especially in low- to middle-income countries including Laos. However, no studies regard perspective of training EMS in Laos emergency medicine residents. AIM: The aim of our work is to demonstrate the effect of EMS training for Laos emergency medicine residents to the development of the national policy in Lao’s EMS. METHODS: A cross-sectional study was conducted in two countries (Laos and Thailand) from January 2020. The project activities were establishment of a command-and-control center, development of EMS support system, and training for emergency care professionals. RESULTS: The eight Laos emergency medicine residents were enrolled between January and March 2020. After practicing as a dispatcher and emergency medical consultant in Thailand at Khon Kaen University, the participants from Laos found that all personnel gained experience and improved their knowledge of technology in EMS and organization management. This had a direct impact on improving confidence in their return to practice in Laos. CONCLUSIONS: The human resource development through international collaboration between Thailand and Laos is contributing the effective knowledge and expertise learning in Laos. Moreover, the result of this training may provide the most effective care system resulting in the much-needed drop in the mortality rate of traffic accidents in Laos.

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The Influence of Road Geometry on Vehicle Rollover and Skidding

Cited by 23 publications

References 32 publications

Evaluation of Safety in Horizontal Curves of Roads Using a Multi-Body Dynamic Simulation Process

Evaluation of Safety in Horizontal Curves of Roads Using a Multi-Body Dynamic Simulation Process

Modeling and Verification of the Length of the Entrance and Exit Sections of an Undersea Tunnel

Understanding of Development Emergency Medical Services in Laos Emergency Medicine Residents

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