Evaluating the effectiveness of guardrail installation on run-off-road crash severity | |
| Author | Mya Bhone Myat Min |
| Call Number | AIT Thesis no.TE-24-07 |
| Subject(s) | Roads--Guard fences--Evaluation Roads--Safety measures--Evaluation |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Transportation Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Single vehicle Run-Off-Road crashes are a major concern in Thailand, leading to the fatalities and installing guardrail is the best option as a countermeasure. The safety effectiveness of current guardrail installation in Suphanburi Area is not evaluated yet, so this thesis focuses on the evaluating the safety performance of existing guardrail and modified guardrail designs by using Empirical Bayes Method and Multiple Regression Model based on Acceleration Severity Index (ASI). The result shows that the existing guardrail design (800 mm height and 4 m post spacing) reduces the fatal crashes by 48.51% and serious injury crashes by 67.07%, and minor injury crashes by 9.87%. For design modification, eight guardrail design models are applied and Model 8 (820 mm height and 1.33 m post spacing) performs the best model, achieving 49.51% reduction in fatal crashes, 68.39% reduction in serious injury crashes and 10.07% reduction in minor injury crashes.For evaluating CMF by using Comparison Group Method, CMF of both existing and modified design results are less than 1 which indicate guardrail installation is an effective countermeasure to eliminate the severity level of errant vehicles. CMFs of existing guardrail are 0.877 (fatal), 0.335 (serious) and 0.868 (minor) while CMFs of modified guardrail are 0.8122 (fatal), 0.3569 (serious) and 0.6349 (minor) by enhancing the overall performance respectively. To sum up, this study provides safety effectiveness of guardrail, and consideration of AADT, barrier segment length, guardrail height, post spacing, and occupant’s severity level (death, serious or minor injury) can enhance understanding of crash severity outcomes and offering safer modified design for future improvements for Thailand’s Highway. |
| Year | 2025 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Transportation Engineering (TE) |
| Chairperson(s) | Kunnawee Kanitpong |
| Examination Committee(s) | Bhatt, Ayushman;Wasin Rujikietgumjorn |
| Scholarship Donor(s) | AIT Scholarship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2025 |