Development of safety performance measures for different crashes severity at urban roundabouts
Roundabouts are widely utilized due to their perceived safety benefits compared to other unsignalized intersections. Studies have demonstrated that roundabouts are effective in reducing the frequency and severity of traffic crashes. However, the crash rate at roundabouts in Jordan has increased over...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-03-01
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| Series: | Results in Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123024019236 |
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| author | Taqwa I. Alhadidi Mohammad Nour Al-Marafi Asma Alazimi |
| author_facet | Taqwa I. Alhadidi Mohammad Nour Al-Marafi Asma Alazimi |
| author_sort | Taqwa I. Alhadidi |
| collection | DOAJ |
| description | Roundabouts are widely utilized due to their perceived safety benefits compared to other unsignalized intersections. Studies have demonstrated that roundabouts are effective in reducing the frequency and severity of traffic crashes. However, the crash rate at roundabouts in Jordan has increased over time. A range of factors can influence the safety performance of roundabouts, including geometric and traffic characteristics. This study aims to quantify the impact of these factors on the safety of urban roundabouts in Amman, the capital of Jordan. To achieve this, three different crash severity prediction models were developed to assess the influence of various contributing factors. Data was collected from 16 roundabouts over a period of seven years, including traffic crashes, geometric characteristics, and traffic counts. Different models were tested, and the Negative Binomial (NB) model was found to be the best fit for traffic crashes frequency. The results indicate that an increase in entry width, inscribed diameter, entry path radius, entry angle, speed limit, number of approaches, weaving length, and weaving width are associated with an increase in roundabout crash risk. On the other hand, an increase in circular width, central diameter, and exit width is associated with a decrease in crash risks. The study also developed Crash Modification Factors (CMFs) using a cross-sectional method, which can be used to investigate the relationship between safety and geometric design features of roundabouts. The findings of this study can be used effectively to determine the appropriate intersection improvement strategies to enhance traffic safety conditions. |
| format | Article |
| id | doaj-art-a28cbde3e1884697a6d46a663510034b |
| institution | OA Journals |
| issn | 2590-1230 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Engineering |
| spelling | doaj-art-a28cbde3e1884697a6d46a663510034b2025-08-20T02:01:24ZengElsevierResults in Engineering2590-12302025-03-012510368010.1016/j.rineng.2024.103680Development of safety performance measures for different crashes severity at urban roundaboutsTaqwa I. Alhadidi0Mohammad Nour Al-Marafi1Asma Alazimi2Civil Engineering Department, Al-Ahliyya Amman University, Amman, 19328, Jordan; Corresponding author.Department of Civil Engineering, Tafila Technical University, Tafila, JordanDepartment of the Construction Project, Ministry of Public Works of Kuwait, Kuwait City 12011, KuwaitRoundabouts are widely utilized due to their perceived safety benefits compared to other unsignalized intersections. Studies have demonstrated that roundabouts are effective in reducing the frequency and severity of traffic crashes. However, the crash rate at roundabouts in Jordan has increased over time. A range of factors can influence the safety performance of roundabouts, including geometric and traffic characteristics. This study aims to quantify the impact of these factors on the safety of urban roundabouts in Amman, the capital of Jordan. To achieve this, three different crash severity prediction models were developed to assess the influence of various contributing factors. Data was collected from 16 roundabouts over a period of seven years, including traffic crashes, geometric characteristics, and traffic counts. Different models were tested, and the Negative Binomial (NB) model was found to be the best fit for traffic crashes frequency. The results indicate that an increase in entry width, inscribed diameter, entry path radius, entry angle, speed limit, number of approaches, weaving length, and weaving width are associated with an increase in roundabout crash risk. On the other hand, an increase in circular width, central diameter, and exit width is associated with a decrease in crash risks. The study also developed Crash Modification Factors (CMFs) using a cross-sectional method, which can be used to investigate the relationship between safety and geometric design features of roundabouts. The findings of this study can be used effectively to determine the appropriate intersection improvement strategies to enhance traffic safety conditions.http://www.sciencedirect.com/science/article/pii/S2590123024019236Traffic crashesRoad safetyCrash prediction modelCrash modification factorCross-sectional modelAccident severity |
| spellingShingle | Taqwa I. Alhadidi Mohammad Nour Al-Marafi Asma Alazimi Development of safety performance measures for different crashes severity at urban roundabouts Results in Engineering Traffic crashes Road safety Crash prediction model Crash modification factor Cross-sectional model Accident severity |
| title | Development of safety performance measures for different crashes severity at urban roundabouts |
| title_full | Development of safety performance measures for different crashes severity at urban roundabouts |
| title_fullStr | Development of safety performance measures for different crashes severity at urban roundabouts |
| title_full_unstemmed | Development of safety performance measures for different crashes severity at urban roundabouts |
| title_short | Development of safety performance measures for different crashes severity at urban roundabouts |
| title_sort | development of safety performance measures for different crashes severity at urban roundabouts |
| topic | Traffic crashes Road safety Crash prediction model Crash modification factor Cross-sectional model Accident severity |
| url | http://www.sciencedirect.com/science/article/pii/S2590123024019236 |
| work_keys_str_mv | AT taqwaialhadidi developmentofsafetyperformancemeasuresfordifferentcrashesseverityaturbanroundabouts AT mohammadnouralmarafi developmentofsafetyperformancemeasuresfordifferentcrashesseverityaturbanroundabouts AT asmaalazimi developmentofsafetyperformancemeasuresfordifferentcrashesseverityaturbanroundabouts |