Examining the factors affecting the severity of run-off-road crashes in Abu Dhabi

Shawky, Mohamed; Hassan, Hany M.; Garib, Atef M.; Al-Harthei, Hussain

doi:10.1139/cjce-2014-0393

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…Another study investigated SVROR crashes that occurred between 2007 and 2013 in the Emirate of Abu Dhabi and found that SVROR crashes accounted for 22 and 25% of all fatal and serious crashes, respectively. It also found that speeding, passenger cars, Emirati drivers, rural roads, and nonintersection locations were all factors that were found to significantly contribute to increased SVROR crash severity (Shawky et al 2016). Though these are all valuable research findings, previous research studies have focused on investigating either SVROR crash characteristics (e.g., location, object hit, and road type) or the relationship between SVROR crash frequency/severity and its contributing factors.…”

Section: Introductionmentioning

confidence: 94%

Roadside design assessment in an urban, low-density environment in the Gulf Cooperation Council region

Albuquerque

Awadalla

2019

Traffic Injury Prevention

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Objectives: Proper roadside design is crucial in order to mitigate the consequences associated with single-vehicle runoff road (SVROR) crashes. However, the Gulf Cooperation Council (GCC) region lacks in-depth, detailed information on its roadside design status. Hence, there is a need for an in-service evaluation of roadside design in the GCC region. The objective of this study is to assess the existing roadside design in a medium-sized, low-density city in the United Arab Emirates (UAE). Methods: A multiyear crash database was used to identify 116 locations where SVROR injury crashes occurred between 2013 and 2016 in the city of Al Ain in the UAE. Visits to these locations were made in order to assess their roadside design. Subsequently, the collected data were analyzed. Roadside design was classified based on whether or not it deviated from roadside design guidelines. The guidelines adopted as a benchmark were those contained in the 2012 Abu Dhabi Department of Transport Roadside Design Guide (RDG) and/or those in the 2011 American Association of State Highway and Transportation Officials (AASHTO) RDG. It is worth stressing that local guidelines are heavily based on the 2011 AASHTO RDG. Results: The study found that almost one quarter of all SVROR crashes resulted in injuries. The study also found that a staggering 80.17% of the SVROR injury crashes investigated occurred at locations where roadside design deviated from the benchmark. Lack of an adequate clear zone was the main cause of noncompliant locations. Most SVROR injury crash locations containing roadside design with deviations from the benchmark were located on roads with posted speed limits of 100 kph or higher. Light poles, trees, curbs, and barriers were the most harmful objects most often struck, and tree collisions accounted for the highest number of severe crashes. Ninety-four and 86% of all studied locations containing light poles and trees, respectively, were found to be noncompliant with the benchmark. Twenty-eight percent of all SVROR injury crashes involved a rollover. All rollovers were preceded by a collision with a tree, pole, guardrail, or curb. Forty-four percent of all rollover crashes resulted in severe injuries. Conclusions: Significant revision of the existing roadside design not only in the area studied but throughout the UAE is recommended. The authors propose measures that may be useful in making roadside design in the area studied better align with the benchmark requirements.

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Section: Introductionmentioning

confidence: 94%

Roadside design assessment in an urban, low-density environment in the Gulf Cooperation Council region

Albuquerque

Awadalla

2019

Traffic Injury Prevention

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“…e major reason for its occurrence is that the driver loses control of the vehicle. Compared with the dry road surface, the slippery road surface is more likely to cause the vehicle go out of control and increase the injury severity of fixed-object hitting crashes [58,59]. Since it is unrealistic to use the rainfall at one site to represent the rainfall of the whole freeway, the current study selects 7 main sites along the road (see Figure 9) to represent the overall rainfall of the Wenli Freeway.…”

Section: Fixed-object Hittingmentioning

confidence: 99%

Exploring Relationships between Months and Different Crash Types on Mountainous Freeways Using a Combined Modeling Approach

Zhang

Bai

et al. 2022

Journal of Advanced Transportation

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Investigating the relationship between the months and traffic crashes is a foremost task for the safety improvement of mountainous freeways. Taking a mountainous freeway located in China as an example, this paper proposed a combined modeling framework to identify the relationships between months and different crash types. K-means and Apriori were initially used to extract the monthly distribution patterns of different types of crashes. A graphical approach and a risk calculation equation were developed to assess the output of K-means and Apriori. Then, using the assessment results as the input, a logistic regression model was constructed to quantify the effects of each month on crashes. The results indicate that the monthly distribution patterns of different crash types are inconsistent, i.e., for a specific month, the high risk of a certain crash type may be covered up if experts only focus on the total number of crashes. Moreover, when identified as high-risk months by K-means and Apriori, the crash-proneness will significantly increase several times than months identified as high-risk by only one of K-means and Apriori, thereby illustrating the superior performance of the mix-method. The conclusions can assist local relevant organizations in formulating strategies for preventing different types of traffic crashes in different months (e.g., the risk of rear-end crashes in August, the risk of fixed-object hitting crashes in February, and the risk of overturning crashes in October) and provide a methodological reference for relevant studies in other regions.

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“…Half of these crashes involved fixed-object collisions, and the other half resulted in rollovers (Al-Dah, 2010). In the Emirate of Abu Dhabi, also part of the UAE, SVROR crashes accounted for over 20 percent of all severe and fatal crashes that occurred between 2007 and 2013 (Shawky et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…More specifically, the roadside safety and design-related literature pertaining to the Gulf Cooperation Council (GCC) region is extremely scarce. For example, the few roadside safety studies conducted in the UAE have focused on investigating either SVROR crash characteristics (e.g., location, object hit, and road type) or the relationship between SVROR crash frequency/severity and its contributing factors (Al-Dah, 2010;Shawky et al, 2016). That is, none of these studies examined the impact roadside design compliance has on SVROR crash severity.…”

Section: Introductionmentioning

confidence: 99%

Impact of Roadside Design Compliance and Hazard Offset on the Risk of Single-Vehicle, Run-Off-Road Crash Fatalities

Awadalla

Albuquerque

2021

International Journal of Injury Control and Safety Promotion

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single-vehicle, run-off-road (sVROR) crashes account for a significant portion of all road-related injuries and fatalities worldwide. however, no previous study has examined to what extent roadside design guidelines have been applied, nor (and most importantly) whether having a compliant roadside design reduces the likelihood of fatal injury occurrence in sVROR crashes. thus, the objectives of this research are i) to examine the level of roadside design compliance within the studied area based on the selected benchmark and ii) to investigate whether roadside design compliance reduces the likelihood of fatal injury occurrence in sVROR crashes. Findings from this study are based on extensive crash and field data collected from 1,070 sVROR injury collisions and locations, respectively. the study shows that i) only 32 percent of the studied locations contained compliant design, and ii) barrier and discrete-obstacle lateral offsets larger than 6 and 12 meters, respectively, tended to lower fatality risk. the 12-meter clear-zone (cZ) width is larger than that recommended by previous research, which has based cZ width recommendations also on cost-benefit procedures and not just on fatality risk reduction.

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Examining the factors affecting the severity of run-off-road crashes in Abu Dhabi

Cited by 9 publications

References 23 publications

Roadside design assessment in an urban, low-density environment in the Gulf Cooperation Council region

Roadside design assessment in an urban, low-density environment in the Gulf Cooperation Council region

Exploring Relationships between Months and Different Crash Types on Mountainous Freeways Using a Combined Modeling Approach

Impact of Roadside Design Compliance and Hazard Offset on the Risk of Single-Vehicle, Run-Off-Road Crash Fatalities

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