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原文传递 Modeling Operating Speed Using Continuous Speed Profiles on Two-Lane Rural Highways in India

题名：	Modeling Operating Speed Using Continuous Speed Profiles on Two-Lane Rural Highways in India
正文语种：	英语
作者：	Vinayak Malaghan;Digvijay S;Hussein Dia;F.ASCE
作者单位：	Transportation Systems Engineering, Dept, of Civil Engineering, Indian Institute of Technology Hyderabad;Dept, of Civil and Construction Engineering, Swinburne Univ
关键词：	Geometric design consistency; Horizontal curves; Global positioning system (GPS); Design speed; Road geometry; Road safety
摘要：	The geometric elements of the road, such as tangents and curves, play a vital role in road safety because significant crashes are reported on the horizontal curves and tangent-to-curve transitions. Literature reveals that inconsistent geometric design of roads violates driver's expectation of operating speed leading to crashes. For safe manoeuver, it is necessary to achieve consistent operating speed with road geometry based on the driver's expectations rather than the designer's perception. Estimation of reliable operating speeds in the design phase will help to design safer road alignments. Several past studies developed operating speed models on the curves and tangent-to-curve transitions. However, these models used spot speed data with the assumption that the constant speed persists on the horizontal curves and entire deceleration/acceleration occurs on the approach/departure tangents. In this study, an instrumented vehicle with a high-end GPS (global positioning system) device was used to obtain the continuous speed profiles for passenger cars which resulted in reliable and robust speed prediction models for a tangent, curve, and tangent-to-curve. The study also establishes a relationship between the differential of the 85th percentile speed (AV85) and 85th percentile speed differential (A85V). The analysis results revealed that AV85 underestimates A85V by 5.32 km/h, and A85V predicted the actual speed reduction from tangent-to-curve transitions. Statistical analysis results showed low errors, variations, and strong correlation of the proposed models with the field data. The models developed in the present study were validated and compared with various other models available in the literature. The comparative study highlights the importance of using continuous speed profile data to calibrate the operating speed models. DOI: 10.1061/JTEPBS.0000447. © 2020 American Society of Civil Engineers.
出版日期：	2020.11
出版年：	2020
期刊名称：	Journal of Transportation Engineering
卷：	Vol.146
期：	No.11
页码：	04020124