Documents of type: Paper

AM18 Poster Hitesh Chawla

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Crash Risk and Access Spacing on Two-Lane and Multi-Lane Highways

Hitesh Chawla; Peter T. Savolainen, Ph.D., P.E.

 

INTRODUCTION

Effective access management is essential to mitigating traffic crash risks. Most of the crashes occurring near access points are a result of conflicts between multiple vehicles. This motivates the development of guidelines for access spacing. To this end, this study evaluated the relationship between crash risk and access point spacing on two-lane and multi-lane highways across the state of Iowa.

AM18 Poster Beiia Zhang

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Access Management to Reduce Wrong-Way (WWD) Driving on Alabama Divided Highways

Beijia Zhang

 

A divided highway is considered as a highway with physical separation, and the side streets are its access points in this study.

WWD crashes are more possible than other kinds crashes to result in fatal or incapacitating injuries. The majority of previous studies are focused on freeways instead of divided highways.

112 WWD crashes were identified in Alabama divided highways from 2009 to 2013.

AM18 Poster Dan Xu (1st Place Poster Award)

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Interchange Deceleration Lane Design Based on Naturalistic Driving Speed and Deceleration Rates

Dan Xu (1st Place Poster Award Winner) and Chennan Xue

(Poster updated 8/1/2018)

The Green Book provides the minimum lengths of deceleration lanes. The length recommendations provided by the 2011 edition are similar to the documents published in 1965, which were based on the data collected in the 1930s and had not been updated. (Fitzpatrick et al., 2012; Abdelnaby, 2014) Data was obtained from NDS dataset, including Video and Time Series Report.

AM18 Poster Md Atiquzzaman (2nd Place)

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Access Control and Geometric Features at the Interchange Terminals with a large number of Wrong-Way Incidents: Case Studies in Alabama

Md Atiquzzaman (Tie for 2nd Place Award)

Although wrong-way driving crashes are rare, they draw a lot of attention due to their severe outcomes. Two interchange terminals were monitored by video camera for 48 hours on a typical weekend. The two locations experienced 10 and 17 WWD incidents.

Objectives

AM18 Poster Chennan Xue, Dan Xu

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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

Model Land Development and Subdivision Regulations that Support Access Management

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 Effective local access management requires planning as well as regulatory solutions. Communities should establish a policy framework that supports access management in the local comprehensive plan, prepare corridor or access management plans for specific problem areas, and encourage good site planning techniques. Land development and subdivision regulations should be amended accordingly and communities may also consider a separate access management ordinance.

Operational Effects of Geometrics and Access Management, 2015

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Operational Effects of Geometrics and Access Management, 2015

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2486, explores 10 papers related to operational effects of geometrics and access management in the transportation sector, including:

Design of Right Turn Lanes

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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.

Performance-Based Safety Evaluation of Requests for New Access or Modifications to Existing Access on Freeways

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Freeway access management activities have traditionally taken a nominal approach to safety. Acceptable safety performance is presumed to result from attaining some desired interchange or ramp spacing. This approach oversimplifies driver behavior and complex interactions between roadway geometrics, traffic operations, and safety. The objective of this paper is to quantify the relationship between ramp spacing and freeway safety, with safety defined as number of accidents, or accident consequences, by kind and severity, expected to occur during a specified time period.

Access Management Implementation in Kentucky

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      This report represents Kentucky’s continued efforts to institute a state-wide access management policy, as set forth in the 2004-2008 Kentucky Transportation Cabinet (KYTC) Joint Strategic Plan.  The suggestions made herein build upon the initial recommendations laid out in Access Management for Kentucky (which had also included an access management implementation plan).

The Role of Access Management in Sustainable Development

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Williams, K. and H. Levinson, “The Role of Access Management in Sustainable Development,” Proceedings of the First T&DI Congress, American Society of Civil Engineers, Chicago Illinois, (2011)
This paper explores the role of access management in accomplishing a more sustainable approach to transportation and development planning in the US. Topics include land use and transportation relationships, network planning and activity center strategies, and site design concepts for urban arterial development. Policy changes are suggested.

Applying Access Management Across the Transect

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Presentation Strader, Brad. “Applying Access Management Across the Transect: Complete Streets,” Proceedings of the 90th Annual Meeting of the Transportation Research Board (presentation only), (January 2011) This presentation suggests a simpler adaptation of the CSS transect framework in ITE’s Designing Walkable Thoroughfares (2010) as a means of organizing access management strategies according to context. It also offers several case examples of these applications in typical rural, suburban and urban contexts. Figure 2 illustrates the overall concept.