期刊
JOURNAL OF TRANSPORTATION ENGINEERING PART A-SYSTEMS
卷 146, 期 2, 页码 -出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/JTEPBS.0000286
关键词
Horizontal curve; Operating speed prediction model; Multilinear regression; Geometric design; Nomogram; Four-lane divided highway
资金
- Indian Institute of Technology Bombay, India [13IRCCSG001]
This paper investigates the free-flow condition suitable for four-lane divided highways and proposes spatial free-flow speed-based operating speed prediction models. The 85th percentile speed (V85) of spatially evaluated free-flow vehicles (passenger car, light commercial vehicle, and heavy commercial vehicle) at the curve center were analyzed with respect to various geometric parameters to develop these models. Among various multiple linear regression techniques explored, the backward elimination method was found to be the best for the adopted data. The curve length (CL), deflection angle (Delta), and preceding tangent length (PTL) were identified as the explanatory variables of the developed models. These models were validated for three different sites located in the western and northeastern parts of India. The explanatory variables Delta and CL can indicate curve appearance; this is in conformation with the design guideline's recommendation of adjusting Delta and CL for a directional and smooth appearance. Therefore, the proposed models can be used to integrate the quantitative and qualitative guidelines for horizontal curve design. Further, they support the design guidelines' recommendation to avoid a longer tangent prior to a sharp curve. Sensitivity analysis indicated the passenger car (PC) as the most critical vehicle category. Hence, the speed prediction model of PC was used for developing the nomograms for consistency-based geometric design of horizontal curves along four-lane divided highways.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据