Traffic conflict points at intersections are the points at which traffic movements intersect (including crossing, merge, and diverge). Numbers and distribution of conflict points have been used to evaluate intersection access management designs and safety performance. Traditionally, determination of numbers of conflict points for different traffic movements has been based on manual methods, which causes the difficulty for computerized procedures to evaluate safety performance of different access management designs.
Documents by all
Liu, P., J. Lu and H. Chen, Safety effects of the separation distances between driveway exits and downstream U-turn locations, Accident Analysis and Prevention, Vol. 40, Issue 2 (2008)
Highway Safety Manual, American Association of State Highway and Transportation Officials, Washington, D.C. (2010).
Rawlings, J. and J. Gattis, Detailed Study of Driveway Collision Patterns in an Urban Area, Transportation Research Board 87th Annual Meeting (2008)
Gans, A., J. Shen, and A. Rodriguez, Update of Florida Crash Reduction Factors and Countermeasures to Improve the Development of District Safety Improvement Projects, prepared for the Florida Department of Transportation, (2005)
Eisele, W. and C. Toycen, Evaluating the Relative Safety of Access Management Treatments in Micro-Simulation, 10th National Conference on Transportation Planning for Small and Medium-Sized Communities (2006)
VHB. Safety Evaluation of Access Management Policies and Techniques, Federal Highway Administration (contract in progress).
The objectives of this ongoing research are to:
1. Develop evaluation models to assess the safety impact of access management policies and treatments relevant to urban, urbanizing, and suburban arterials.
2. Propose an access management evaluation framework that can be adopted by state and local agencies to evaluate compliance of access management policies, and the impacts of viable access treatment techniques.
Schultz , G., J. Lewis, and T. Boschert, Safety Impacts of Access Management Techniques in Utah, Transportation Research Record: Journal of the Transportation Research Board, No. 1994, Transportation Research Board of the National Academies, Washington, D.C., (2007, pp. 35-42). [Schultz, G. and J. Lewis, Assessing the Safety Benefits of Access Management Techniques, Brigham Young University, Utah Department of Transportation (2006)]
Potts, I. B., D. W. Harwood, D. J. Torbic, K. R. Richard, J. S. Gluck, H. S. Levinson, P. M. Garvey, R. S. Ghebrial, NCHRP Report 524: Safety of U-Turns at Unsignalized Median Openings, Transportation Research Board of the National Academies, Washington, D.C. (2004)
Potts, I., Harwood, D., and Richard, K. Relationship of Lane Width to Safety for Urban and Suburban Arterials, Presented at the 86th Annual Transportation Research Board meeting, Washington, D.C. (2007).
Mauga, T. and M. Kaseko, Modeling and Evaluating Safety Impacts of Access Management Features in Las Vegas, Nevada, Valley, Transportation Research Record: Journal of the Transportation Research Board, No. 2171, Transportation Research Board, Washington D.C. (2010) pp. 57-65
Gattis, J., Safety Effects of Access Design Decisions ITE 2008 Technical Conference and Exhibit (2008)
This paper contains a detailed literature review of studies which have examined and reported safety of designs and operational features that contribute to managing access along roadways. It also presents trends found among the findings reported in these previous studies.
Thieken, S., Implementing Multi-Lane Roundabouts in Urban Areas, Proceedings of the 2007 Transportation Land Use, Planning, and Air Quality Congress, American Society of Civil Engineers (2008)
Lu, G., F. Guan and D. Noyce, Simulation Study of Access Management at Modern Roundabouts: Pedestrian Crosswalk Treatments, 90th Annual Transportation Research Board Meeting, Washington, D.C. (2011)
Isebrands, H., S. Hallmark, E. Fitzsimmons and J. Stroda. Toolbox to Evaluate the Impacts of Roundabouts on a Corridor or Roadway Network, Prepared for the Minnesota Department of Transportation, Iowa State University, Ames (2008)
Federal Highway Administration. Roundabouts: An Informational Guide, 2nd edition. Washington, D.C., (2011)
Johnson, M. and H. Isebrands. Access Management Considerations for High Capacity Multi-Lane Roundabout Design and Implementation, Proceedings of the 8th National Access Management Conference, Baltimore, MD (2008)
Ariniello, A. Are Roundabouts Good for Business?, Proceedings of 1st National Roundabout Conference, Vail, Colorado (2005)
Rosales, J., Road Diet Handbook: Setting Trends for Livable Streets. Parsons Brinckerhoff Monograph 20, New York, New York (2006)
Lambert, J., A. Linthicum, E. Kim, L. Kincaid, S. Rash and G. Schmidt, Risk-Based Framework Using Geographic Information Systems to Identify Transportation Corridors Vulnerable to Development, Virginia Transportation Research Council, Virginia Department of Transportation, Federal Highway Administration (2008)
Williams, K. and R. Frey. Corridor Preservation: Best Practices for Local Governments, Transportation Research Record: Journal of the Transportation Research Board, No. 1895, Transportation Research Board of the National Academies, Washington, D.C. (2004)
Land Design Inc. Corridor Preservation Methods, prepared for the North Carolina Department of Transportation, (2004)
This report review methods available to state transportation agencies and local governments to preserve right of way for transportation corridors and includes a discussion of access management. In addition to North Carolina, it briefly summarizes practices available in Kansas, California and Florida.
Huntington, D. & Wen, J. NCHRP Synthesis 351: Access RightsA Synthesis of Highway Practice, Transportation Research Board of the National Academies, Washington, D.C., (2005)
Eisele, W. and W. Frawley, Access Management Outreach Materials: Promoting Access Management Benefits in Texas, ITE 2008 Annual Meeting and Exhibit (2008)
McMurtry, P. Access Management Public Outreach Project, Vermont Agency of Transportation, 7th National Access Management Conference, Park City, Utah (2006) Describes a three-pronged marketing campaign for access management in Vermont based on education, advocacy and resource materials.