Development of a Posted Speed Limit Setting Procedure and Tool (2021) / Chapter Skim
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Pages 20-26
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 8 CHAPTER 3. FINDINGS Following are key findings by each of the major efforts within each phase.
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 9 speed for significant lengths of time and for a significant number of sites. A 2017 study on rural two-lane highways in Israel (9)
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 10 USLIMITS2, a precise value for signal or access density (e.g., 4 signals per mile) would change the recommendation.
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 11 use of the 85th percentile speed. The use of the 85th percentile speed has been supported with the following: Represents a safe speed that minimizes crashes.
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 12 Within each of these SLSGs, a unique set of decision rules was developed. For the Limited-Access and Undeveloped SLSGs with their higher operating speed and greater emphasis on mobility, retaining a connection to measured operating speed was deemed appropriate.
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 13 speed distribution of drivers on that segment is used to identify a potential SSL that is then adjusted with consideration of the crash potential for the segment. Figure 1 illustrates the steps for the procedure.
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool 14 procedure. The presentations with the panel were especially influential in setting the direction for the SLS-Procedure and SLS-Tool.
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