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原文传递 Work Zone Variable Speed Limit Systems: Effectiveness and System Design Issues.

题名：	Work Zone Variable Speed Limit Systems: Effectiveness and System Design Issues.
作者：	Fudala-N.J.; Fontaine-M.D.
关键词：	Work-zones; Speed-limit.;Law-enforcement; Changeable-message-signs; Traffic-control-devices; Warning-systems; Traffic-safety; Accident-reduction; Construction-site-traffic-control; Traffic-congestion; Urban-areas; Evaluation-.
摘要：	Variable speed limit (VSL) systems have been used in a number of countries, particularly in Europe, as a method to improve flow and increase safety. VSLs use detectors to collect data on current traffic and/or weather conditions. Posted speed limits are then dynamically updated to reflect the conditions that motorists are actually experiencing. Presenting drivers with speed limits that are appropriate for current conditions may reduce speed variance, a concept sometimes called speed harmonization. If properly designed, VSL systems have been shown to reduce crash occurrence and can also reduce system travel time through increased uniformity in traffic speeds. High-volume urban work zones tend to be prone to congestion and safety problems, and VSLs may be one way to ameliorate these issues.
报告类型：	科技报告