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Updated Short-Term Freeway Work Zone Lane Closure Capacity Values
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1992-09-01
[PDF-1.36 MB]
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Edition:Interim Report (September 1986-August 1992)
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Abstract:Recommendations on estimating the capacity of short-term freeway work zone lane closures are presented. The recommendations are based upon 45 hours of capacity counts at 33 different work zones between 1987 and 1991. These new data indicate average capacities for short-term freeway work zone lane closures from 3 to 1 lanes and from 2 to 1 lanes that are significantly higher than older values reported in the 1985 Highway Capacity Manual. A base capacity value of 1,600 pcphpl is recommended for all short-term freeway work zone lane closure configurations. Adjustments are recommended for the effects of the intensity of work activity, percentage of heavy vehicles in the traffic stream, and presence of entrance ramps near the beginning of the lane closure. It is recommended that the new base capacity value and adjustments be used in lieu of the current procedures in the 1985 Highway Capacity Manual.
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