An examination of the performance of damaged energy-absorbing end terminals

Meng, Yanmei; Hu, Wen; Untaroiu, Costin D.

doi:10.1016/j.aap.2020.105789

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…Moreover, extensive studies intended to address potential crash factors have focused on direct countermeasures [ 2 ]. The proposed safety measures include airbags, electronic stability controllers, energy-absorbing guardrails, and speed enforcement systems [ 3 – 5 ]. Although these advanced technologies can intuitively reduce crash risk at the initial stage, their safety enhancements encounter bottlenecks in long-term use [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Multivariate analysis of roadway multi-fatality crashes using association rules mining and rules graph structures: A case study in China

Xu²,

Gao³

et al. 2022

PLoS ONE

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Roadway multi-fatality crashes have always been a vital issue for traffic safety. This study aims to explore the contributory factors and interdependent characteristics of multi-fatality crashes using a novel framework combining association rules mining and rules graph structures. A case study is conducted using data from 1068 severe fatal crashes in China from 2015 to 2020, and 1452 interesting rules are generated using an association rule mining approach. Several modular rules graph structures are constructed based on graph theory to reflect the interactions and patterns between different variables. The results indicate that multi-fatality crashes are highly associated with improper operations, passenger overload, fewer lanes, mountainous terrain, and run-off-the-road crashes, representing the key variables of factors concerning driver, vehicle, road, environment, and accident, respectively. Furthermore, crashes involving different severity levels, road categories, and terrain are verified to possess unique association rules and independent crash patterns. Moreover, the proportion of severe crashes caused by a combination of human-vehicle-road-environment factors (43%) is much higher than that of normal crashes (3%). This study reveals that the hidden associations between various factors contribute to the overrepresentation and severity of multi-fatality crashes. It also demonstrates that the crash mechanisms involving multi-fatality crashes and their interactions are more complex at the system level than those for normal crashes. The proposed framework can effectively map the intrinsic link between multiple crash factors and potential risks, providing transportation agencies with helpful insights for targeted safety measures and preventive strategies.

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Section: Introductionmentioning

confidence: 99%

Multivariate analysis of roadway multi-fatality crashes using association rules mining and rules graph structures: A case study in China

Xu²,

Gao³

et al. 2022

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…Other studies have assessed the effects of the distance between the terminal and traffic lane [ 111 ] and how different barrier terminals affect the safety of vehicle occupants [ 112 ]. Research by Meng et al using numerical tests shows that damaged crashworthy terminals have an effect on accident consequences [ 113 ].…”

Section: Introductionmentioning

confidence: 99%

Assessing Roadside Hybrid Energy Absorbers Using the Example of SafeEnd

et al. 2022

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A combination of crash cushion and end-terminal, hybrid energy absorbing devices have been in use worldwide for a few years already. They include SafeEnd, a system Poland has recently introduced. Some road authorities have raised concerns as regards the operating conditions of the devices and how they work together with safety barriers. The objective of this research is to clarify the concerns and answer the following questions: (1) Can SafeEnd devices be used as hybrid devices and combine the roles of end-terminal and crash cushion placed before an obstacle? (2) What should be the rules for installing crash cushions at diverging roads and at the start of an off-ramp? The article presents characteristics of SafeEnd devices, defines the doubts raised by road safety auditors, discusses the results of field and numerical tests of the devices and explains the design principles for interchange ramps where crash cushions are required. The study results have helped to answer the research questions: SafeEnd devices fulfil the role of end-terminal and crash cushion, it is possible to make them more visible and principles have been defined for how the devices should be used at road interchanges. Further research should help to define general principles of deploying road restraint systems such as crashworthy terminals, crash cushions or hybrid devices.

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“…One of them may be the local constraints associated with the topology of the surrounding terrain and/or existing road infrastructure. Despite there being many studies on vehicular impacts into RSBs [ 25 , 26 , 27 ] or impacts into supporting structures [ 28 , 29 , 30 ], there are almost no studies investigating the influence of the installation of supporting structure in the barrier’s working width on the crash outcome. One of a few studies on that subject was performed by La Torre et al [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of a Lighting Column in the Working Width of a W-Beam Barrier on TB51 Crash Test

et al. 2022

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Road equipment, such as, e.g., road safety barriers and lighting columns, are subject to certification according to the EN1317 standard to be allowed for use on European roads. In engineering practice, due to the terrain conditions, there are cases where other road equipment is installed within the working width of road safety barriers. Such situations are not considered during the certification process. Hence, the aim of this study is to analyze the effect of a lighting column installed within the working width of the barrier on the results of the TB51 crash test. The full-scale crash test and numerical simulation of this event were conducted. In the full-scale crash test, as well as in the simulation, the lighting column prevented the barrier’s post from properly disconnecting from the guardrail, which resulted in the barrier failing to restrain and redirect the 13-t bus. The simulation was quantitatively compared to the experiment, where the correlation coefficient of ASI curves equaled 84%. The THIV curves differed significantly between the experiment and the simulation, which is explained within the paper. Next, simulations with and without the lighting column were compared. The ASI and THIV in the simulation without the column were 0.33 and 16.1 km/h, respectively. In the simulation with the column, the ASI and THIV were 0.44 and 17.7 km/h, respectively. The maximum roll angle of the vehicle in the simulation without the column was 2.01° and with the column was 5.96°. The main difference, however, was that the system without the lighting column within the working width of the barrier was capable of properly restraining and redirecting the vehicle. The specific mechanics underlying this behavior are described within the paper.

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An examination of the performance of damaged energy-absorbing end terminals

Cited by 7 publications

References 16 publications

Multivariate analysis of roadway multi-fatality crashes using association rules mining and rules graph structures: A case study in China

Multivariate analysis of roadway multi-fatality crashes using association rules mining and rules graph structures: A case study in China

Assessing Roadside Hybrid Energy Absorbers Using the Example of SafeEnd

Influence of a Lighting Column in the Working Width of a W-Beam Barrier on TB51 Crash Test

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