An Evaluation of Ramp Control Signal Head Placement Based on Motorist’s Cone of Visions

作     者：Zhongren Wang Hiep Nguyen 

作者机构：Division of Traffic OperationsCalifornia Department of Transportation1120 N StreetMS-36SacramentoCA 95814 

出 版 物：《International Journal of Transportation Science and Technology》 (交通科学与技术(英文))

年 卷 期：2014年第3卷第3期

页      面：265-276页

学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学] 

主　　题：mounted approaching specified 

摘      要：Roadside mounted ramp control signals have one upper head,and one lower head in *** upper head is intended for use by the approaching motorists,while the lower one for use by the stopped *** have been received regarding the visibility of these signal *** evaluation presented in this paper is to mathematically analyze the visibility of these signal heads on a tangent roadway alignment based on satisfactory motorists’cones of *** design,signal placement,and driver characteristics are integrated into one analytic *** results indicated that the horizontal satisfactory cone of vision controls the placement *** meet the 20 degree satisfactory horizontal cone of vision as specified by the Manual on Uniform Traffic Control Devices(MUTCD),a ramp control signal head has to be placed a minimum of 13.3 m downstream of the limit line.