[1] Guo Tangyi, Deng Wei, Hou Jiansheng, Lu John, et al. Placement distance of freeway exit advance guide signand its safety impacts [J]. Journal of Southeast University (English Edition), 2010, 26 (4): 622-627. [doi:10.3969/j.issn.1003-7985.2010.04.025]

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Placement distance of freeway exit advance guide signand its safety impacts()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

26

Issue:

2010 4

Page:

622-627

Research Field:

Traffic and Transportation Engineering

Publishing date:

2010-12-30

Info

Title:

Placement distance of freeway exit advance guide signand its safety impacts

Author(s):

Guo Tangyi¹;  Deng Wei¹;  Hou Jiansheng²;  Lu John³

¹ School of Transportation, Southeast University, Nanjing 210096, China
² Transportation Institute, Inner Mongolia University, Hohhot 010021, China
³ Department of Civil and Environmental Engineering, University of South Florida, Tampa 33620, USA

Keywords:

freeway;  advance guide sign;  placement distance;  safety impact;  lane change

PACS:

U491.5+21

DOI:

10.3969/j.issn.1003-7985.2010.04.025

Abstract:

To remedy the empirical pitfalls of current chinese specifications and MUTCD 2009 guidelines in determining the placement distance of freeway exit advance guide signs, the driving maneuver of exiting traffic is analyzed and the factors influencing placement distance are explored. Variables including the number of lanes, lane width, lane-changing time, driver’s visual characteristics, sign installation methods and operating speeds on both freeway mainlines and exit ramps are found significant in explaining exit safety. Three different installation methods, namely ground installation, overhead installation and median installation, are introduced and their applicable conditions are given. Models, with the same structure among the three installation methods, are developed to compute the placement distance under different roadway geometric and traffic conditions. Taking overhead installation as an example, simulation results in TSIS-CORSIM show that the proposed distance reduces the number of lane changes in the area from the ramp nose to 500 m upstream by 58.93% compared with current Chinese specifications and 27.35% compared with MUTCD 2009 guidelines. Thus, the distances recommended in this paper have a better safety performance.

References:

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[3] Texas Transportation Institute. Sign crew field book: a guide to proper location and installation of signs and other devices [R]. Austin, TX, USA: Texas Department of Transportation, 2007.
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[10] Zwahlen H T, Russ A, Roth J M, et al. The effectiveness of ground mounted diagrammatic advance guide signs for freeway entrance ramps [J]. Transportation Research Board, 2003(1843):70-80.
[11] Roger P R, Elena S P, William R M. Traffic engineering [M].3rd ed. Upper Saddle River, NJ, USA: Pearson Education, Inc., 2004: 19-23.
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[13] Salvucci D D, Liu Andrew. The time course of a lane change: driver control and eye-movement behavior [J]. Transportation Research Part F, 2002, 5(2): 123-132.

Memo

Memo:

Biographies: Guo Tangyi(1982—), male, graduate; Deng Wei(corresponding author), male, doctor, professor, dengwei@seu.edu.cn.
Foundation items: Project of Florida Department of Transportation(No. BD54438), the National Key Technology R&D Program of China during the 11th Five-Year Plan Period(No.2006BAJ18B03).
Citation: Guo Tangyi, Deng Wei, Hou Jiansheng, et al.Placement distance of freeway exit advance guide sign and its safety impacts[J].Journal of Southeast University(English Edition), 2010, 26(4):622-627.

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