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Corridor-based forecasts of work-zone impacts for freeways.
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2011-08-09
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[PDF-25.30 MB]
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Abstract:This project developed an analysis methodology and associated software implementation for the evaluation of
significant work zone impacts on freeways in North Carolina. The FREEVAL-WZ software tool allows the analyst
to predict the operational impacts of work zones, including impacts from capacity reductions, lane closures, reduced
speed limits and traffic diversions. The research is based on the 2010 Highway Capacity Manual Freeway Facilities
methodology and its companion FREEVAL-2010 computational engine. Through this project, the tool was
enhanced to allow for work-zone specific impact assessment, customized to the needs of the NCDOT Traffic
Management Unit. The tool includes a new planning-level feature that enables a quick assessment of work zone
impacts, while still allowing for a more detailed operational analysis. The tool uses default values for work zone
inputs specific for North Carolina conditions. However, all inputs can be adjusted by the user. Further, the
methodology allows the analyst to calculate user cost impacts of the work zone. All calculations and algorithms in
FREEVAL-WZ are consistent with the methodologies in the 2010 Highway Capacity Manual. The project included
a significant field validation and model calibration efforts with operational data collected directly by NCDOT using
field sensors. The data was used to compare predicted model performance to field operations and to develop default
parameters for typical North Carolina work zone configurations. Project deliverables include a final report, the
actual FREEVAL-WZ tool, and a software user manual.
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