Design Guidelines for Stop-Controlled Intersections Along Curved, High-Speed Major Road Alignments
Record Type: DOT
Although the broken-back curve seems a logical solution for the given problem, some inherent troubles exist that could be resolved by appropriate research which is required to properly understand the problem, both along the through-traffic major roadway and at the minor-road stop. No guidance is currently available as to how the combination of broken-back curvature impacts drivers along the major road. Also, the current intersection sight distance model in the 2004 Green Book was not developed using data from curved major road alignments, so it is possible that it does not accurately represent the appropriate intersection sight distance triangle needed for such a situation. The alignment solution of using broken-back horizontal curves in the situation described above is one that attempts to optimize the geometric design of the roadway with respect to safety, operational efficiency, construction costs and maintenance efforts while minimizing the use of surrounding right-of-way. The successful understanding of the problem could lead to guidelines that would assist designers in finding the appropriate length of the tangent segment between curves to provide these optimal conditions. Combination of low traffic volume and complementary vertical geometry may result in the broken-back curve design being the optimal configuration in certain situations that could be defined by this research project. The approach taken to understand the problem and resolve these design issues could be developed in such a way as to set the format for the solution of similar geometric problems that surface over time, resulting in a better solution for this situation and laying the groundwork for solutions in the future.
Start date: 2006/7/1
End date: 2008/9/30
Status: Active
Contract/Grant Number: P599
Total Dollars: 133418
Source Organization: Nebraska Department of Roads
Date Added: 07/25/2006
Index Terms: Design, Guidelines, Stop signs, Sight distance, Intersections, Curvature, Traffic volume, Alignment, Right of way (Traffic), Geometric design, Highway design, Research projects,
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