A Probabilistic Model to Predict Intermittent Sight Distance Obstruction at Unsignalized Intersections on High-Speed Rural Divided Highways

Chennan Xue and Dan Xu

Minor-road left-turn vehicles’ views are likely to be blocked by major-road right-turn vehicles on the conventional right-turn lane at unsignalized intersections.

Conclusions

12th National Access Management Conference Proceedings

Madison Wisconsin, July 17-19, 2018

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TRB's Access Management Application Guidelines (AMAG) focuses on the applications of access management concepts and provides research-based guidelines on access management treatments and procedures for their applications. The AMAG is a how-to tool for continuing the evolution of access management applications in the United States.

This paper provides an expansion and explanation of the presentation of the "Design of Right-Turn Lanes" presented in Session 619 of the 2015 Annual Meeting of the Transportation Research Board. The paper addresses the operational issues and the design of right-turn lanes. As indicated in the paper, many issues relating to right-turn lanes are the same as for left-turn lanes. Deceleration rates reported in NCHRP Report 780 for left-turns are reasonably consistent with those previously assumed. The rationale for taper length as opposed to taper ratio is discussed.

TRB’s Access Management Manual, second edition, provides guidance on a coordinated approach to transportation and community design that is designed to help enhance mobility, provide greater mode choice, and improve environmental quality. The content is interdisciplinary, with guidance pertinent to various levels of government as well as to pedestrians, bicyclists, and motorized vehicles, including trucks and buses. Access management is addressed comprehensively, as a critical part of network and land use planning. Key updates include

Yanguy Liu

A Study of the Opening Size of Auxiliary Lanes on the Driving Behavior-based analysis

TRB's Access Management Manual provides technical information on access management techniques, together with information on how access management programs can be effectively developed and administered.

Williams, K. and K. Seggerman, Mobility Review Guide: A Proposed Practice, prepared for the Florida Department of Transportation, Center for Urban Transportation Research (2010)

Kikuchi, S. and N. Kronprasert, “Determining the Length of the Right-turn Lane at a Signalized Intersection,” Transportation Research Record 2060, Transportation Research Board of the National Academies, Washington, D.C. (2008) pp. 19-28.

Boonsiripant, S., M. Hunter, K. Dixon and M.O. Rogers, “Measurement and Comparison of Acceleration and Deceleration Zones at Traffic Control Intersections,” Proceedings of the 89th Annual Meeting of the Transportation Research Board, ( 2010)

Harmelink, M. D. “Volume Warrants for Left-Turn Storage Lanes at Unsignalized Grade Intersections,” Highway Research Record, No. 211, Highway Research Board, National Research Council, Washington, D.C. (1967), pp. 1-18.

The objective of this synthesis was to summarize the key findings of various geometric design research efforts published in the 1990s. In the decade following the publication of the 1990 edition of AASHTO’s A Policy on Geometric Design of Highways and Streets (also known as the Green Book), the research community conducted a large amount of research with potentially significant implications on safety and operations. The primary goal of this synthesis was to capture and distribute that information for consideration in the development of the 2004 edition of the Green Book.