Selecting Ramp Design Speeds, Volume 1: Guide (2021) / Chapter Skim
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Pages 122-125
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122 Section 6. Summary of Design Guide and Future Research Needs This section summarizes guidelines for selecting appropriate ramp design speeds.
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123 should typically increase in a stepwise manner; and for exit ramps the design speeds of the contiguous segments along the ramp proper should decrease in a stepwise manner. Decreasing design speeds sequentially along a ramp in a stepwise manner is more critical for exit ramps than increasing design speeds along a ramp for entrance ramps, as unexpected and abrupt changes in design speeds along an exit ramp are more likely to be associated with potential lane keeping and/or loss of control issues.
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From page 124... ...
124 based tool may be used to predict vehicle speeds based upon anticipated driver behaviors or design conditions. The output from the tool may be interpreted to help design an interchange ramp in a consistent manner that meets driver expectations.
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From page 125... ...
125 10-6 which provides guide values for minimum deceleration lengths was adapted (see Table 7) for use with higher design speed facilities.
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