Guidelines for Ramp and Interchange Spacing (2011) / Chapter Skim
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Pages 168-180
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From page 168... ...
168 Appendix B Traffic Operations Tools
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This appendix contains charts summarizing the operational findings of the research conducted for this project. Appendix B 169
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Impacts of Ramp Spacing on Freeway Speed Simulation models of entry-entry and entry-exit (without an auxiliary lane) ramp combinations were used to assess the impact of ramp spacing on freeway speeds.
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2. The maximum corresponding point-speed difference.
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Entry-Entry Mainline Entering Volume 1,250 vphpl, 700-ft spacing and 2,500-ft spacing: Comparison of Lowest Speed Reported (The graph for corresponding speed differentials was omitted for this mainline volume due to it showing no speed differentials greater then 2 mph.)
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From page 176... ...
Impacts of Auxiliary Lanes on Freeway Speed Comparisons of the entry-exit ramp configuration with and without an auxiliary lane between the ramps are shown in the following charts. For each entry-exit model an auxiliary lane was added, and the results were compared to entry-exit ramp combinations without auxiliary lane results that were presented in the previous sections.
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From page 178... ...
Impacts of Ramp Spacing on Ramp-Freeway Junction Level of Service (LOS) The HCM provides a procedure for analyzing ramp-freeway junctions on two-, three-, and four-lane freeways.
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From page 179... ...
Minimum Ramp Spacing to Achieve LOS C on a Three-Lane Freeway Minimum Ramp Spacing to Achieve LOS D on a Three-Lane Freeway Appendix B 179
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From page 180... ...
Minimum Ramp Spacing to Achieve LOS E on a Three-Lane Freeway 180 Guidelines for Ramp and Interchange Spacing
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