Work Zone Speed Management (2015) / Chapter Skim
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Pages 27-34
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27 chapter three ENGINEERING TECHNOLOGIES INTRODUCTION This chapter discusses technologies -- predominantly electronic technologies -- intended to enhance driver awareness and/or compliance with work zone speed limits. CHANGEABLE SPEED LIMIT SIGNS FOR WORK ZONES Changeable speed limit (CSL)
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28 found that the system was effective in reducing the longitudinal speed differences along the work zone area during the weekday morning peak period. Traffic throughput also increased (Kwon et al.
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29 9 months of after data (May 2009 through January 2010) were used for this study.
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30 ment measures (such as additional active law enforcement patrols) are needed.
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31 The units combined a standard PCMS, a radar speed data collection unit, and a set of blue and amber flashing lights -- colors are associated with the California Highway Patrol. The flashing lights and a slow down message were activated when a vehicle traveling 5 mph or 10 mph over the speed limit was detected (Figure 12)
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32 expected to affect speeding vehicles more than general traffic, because it is anticipated that drivers who intend to exceed the speed limit are more likely to have radar detectors. Consequently, the effectiveness of decoy radar depends on the number of radar detectors in the traffic stream.
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33 Date Study Description Configuration Results 1986 Northern Kentucky (Pigman et al.
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34 conjunction with decoy radar operation to maintain its effectiveness over the long term. A 1991 Texas study reported that severe braking and last minute lane changing increased when decoy radar was in operation (Ullman 1991)
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