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The FHWA Office of Operations provides resources on Work Zone Speed Management from observing to managing speeds in work zones. The FHWA report Guidelines for the Use of Variable Speed Limit Systems in Wet Weather provides details on how variable speed limits can be used during wet weather conditions for roads where the operating speed exceeds the design speed and stopping distance exceeds the available sight distance.
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Transportation professionals should also consider special conditions, such as intersections, transition zones, work zones and school zones, bicycle and slow lanes, safe truck speeds, and possibly the need for variable speed limit systems when designing a road and determining speed limits.
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