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Curve advisory speed signs setting for freeway at mountain area(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2011年04期
Page:
77-80,93
Research Field:
Publishing date:
2011-08-20

Info

Title:
Curve advisory speed signs setting for freeway at mountain area
Author(s):
WANG Jun-lei;  SUN Xiao-duan;  XU Ting;  HE Yu-long
Center of Transportation Research, Beijing University of Technology, Beijing 100124, China
Keywords:
traffic engineering;  advisory speed sign;  speed difference;  visibility;  advanced distance
PACS:
U412.24
DOI:
-
Abstract:
Advisory speed signs are rarely used in China and Chinese researchers are seldom focused on this issue before. Traffic safety records are distinct different for curves section and tangent sections. Advisory speed limit signs setting for curve sections of mountain freeway is studied. Speed information from 8 provinces are collected by GPS terminal and Metrocount for one year. Speed difference concept is figured out and speed differential threshold is determined by linear model. Speed difference is bound to exceed 15 km/h when horizontal curve radius is small than 300 meters. The value of advisory speed sign is determined when considering traffic safety and flow speed. Human identification process toward traffic signs was analyzed. The location of advisory speed sign is determined considering drivers visual characteristics and operating speed. 4 tabs, 4 figs, 12 refs.

References:

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Memo

Memo:
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Last Update: 2011-08-20