Impact on driver behaviour of guardrails of different height in horizontal-vertical coordinated road scenarios with a limited available sight distance |
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| Institution: | 1. Department of Environment, Land and Infrastructure Engineering (DIATI), Politecnico di Torino, Italy;2. Departamento de Ingeniería del Transporte, Territorio y Urbanismo, E.T.S.I.C.C.P., Universidad Politécnica de Madrid, Spain;1. Mustafa Kemal University, Iskenderun 31200, Turkey;2. Department of Civil Engineering, Adnan Menderes University, 09000 Aydın, Turkey;3. Department of Civil Engineering, Mustafa Kemal University, 31200 Iskenderun, Turkey;1. University of Central Florida, Civil, Environmental, and Construction Engineering Department, 12800 Pegasus Drive, Suite 211, Orlando, FL 32816, USA;2. University of Central Florida, Department of Psychology, Building 99, 4111 Pictor Lane, Orlando, FL 32816-1360, USA;1. CCCC Second Highway Consultants Co., Ltd, Wuhan 430056, China;2. School of Water Conservancy and Civil Engineering, Zhengzhou University, Zhengzhou 450001, China;3. Highway Engineering Bureau Group Co., Ltd of Henan Province, Zhengzhou 450052, China;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, Hunan 410082, PR China;2. Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment, Ministry of Education, Hunan University, Changsha, Hunan 410082, PR China;3. UM-SJTU Joint Institute, Shanghai Jiao Tong University, Minhang, Shanghai 200240, PR China;4. School of Mechanical Engineering, Hunan Institute of Engineering, Xiangtan, Hunan 411104, PR China |
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| Abstract: | Drivers consider traffic barriers (e.g., guardrails) a protection system, a hard obstacle and a sight obstruction. Hence, the possibility of using containment level barriers which are higher and superior than the minimum required by current standards should be carefully evaluated. Moreover, research investigations into their impact on driver behaviour should be designed so as to distinguish between the effects associated with each of the three roles cited above.This driving simulation study investigates how drivers adapt their longitudinal and transversal behaviour when negotiating curves with guardrails of different heights on horizontal-vertical coordinated two–lane rural road settings, with consideration given solely to the sight obstruction effect of the guardrails. Fifty-four participants drove four out of the eighteen possible scenarios obtained when the same horizontal alignment is combined with three vertical profiles with three inner roadside treatments (no guardrails, 0.75 m two–wave and 0.95 m three-wave guardrails) and the two driving directions.Research outcomes confirm that guardrail height has a significant impact on lateral and longitudinal behaviour. With the minimum standard, i.e., the minimum height, drivers stay closer to the roadside, while higher guardrails result in drivers increasing their lateral distance. Speeds are influenced by the interaction between the guardrail and other geometric and human factors. Male and female drivers adapt differently to the limitation in the available sight distance caused by the guardrail: males increase their speed, adopting a more aggressive behaviour than females. Important safety implications due to the higher speeds and wider trajectories have to be considered at the design stage. |
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| Keywords: | Driving simulation Guardrails Available sight distance Driver behaviour Design decision |
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