Posted Speed Limit Setting Procedure and Tool: User Guide (2021) / Chapter Skim
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5 Speed Limit Relationships and Practices Speed and Crashes Approximately one-quarter of all traffic fatalities are related to speeding (Figure 2) , either traveling in excess of the posted speed limit or driving too fast for the conditions.
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6 Posted Speed Limit Setting Procedure and Tool: User Guide This user guide discusses a procedure that can be used to identify a suggested posted speed limit for a street or highway segment. The procedure is based on the speed distribution for a segment of current drivers with adjustments for the consideration of safety.
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Speed Limit Relationships and Practices 7 after considering the recommendations of their agency's traffic engineers but not always, and sometimes without limiting their considerations to 85th percentile speeds. Like most efforts in traffic engineering, setting speed limits involves balancing competing desires and perceptions.
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8 Posted Speed Limit Setting Procedure and Tool: User Guide has a significant effect on free-flow speed on urban streets (6, 7, 8, 9, 10, 11, 12) , rural two-lane highways (13, 14, 15, 16)
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From page 9... ...
Speed Limit Relationships and Practices 9 urban one, has already been established, so a large part of the effort of achieving target speeds involves retrofitting the existing environment. Since only lane width, reallocating the cross section, elements on the roadside such as bus stops or trees, and vertical and horizontal deflections to alter the physical alignment are available, a clear understanding of what combination of those, and in what configurations, achieves target speeds (or at least what greatly influences operating speeds)
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