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... 1   Several factors are considered within engineering studies when determining the posted speed limit for a speed zone. National Cooperative Highway Research Program (NCHRP)
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... 2 Posted Speed Limit Setting Procedure and Tool: User Guide The guiding principles developed by the research team for the SLS-Procedure included the following: • Use a data-driven approach with research-based decision rules. • Produce consistent results for a given set of conditions.

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