United States Department of Transportation
i
Development of a guideline for work zone diversion rate and capacity reduction.
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2016-03-01
[PDF-24.79 MB]
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Abstract:This study develops a comprehensive guideline to estimate the traffic diversion rates and capacity reduction for
work zones. The analysis of the traffic diversion patterns with data from past work zones in the metro freeway
network in Minnesota resulted in a set of the diversion-estimation models that relate the diversion rates at freeway
ramps with the travel times and speed levels on a freeway and alternative routes during construction. The
interrelationship between diversion and work-zone traffic conditions has led to the development of an iterative
process, where a freeway simulation model interacts with the diversion-estimation models until a convergence is
achieved between diversion and resulting freeway delays. Freeval is adopted in this study as the simulation tool for
freeways. The test results of the iterative process with the work zone data showed promising results in determining
both the diversion rates and freeway delay for a given work-zone. Due to the types of the work zones used in
developing the diversion models, the iterative process developed in this study can be applicable to only “two-toone”
lane reduction cases in estimating the diversion rates for the mainline exit flows, while the diversion rates at
entrance ramps can be determined without such restrictions. The capacity analysis of the lane-closure sections
performed in this study has also resulted in a set of the suggested capacity values for the work zones with two-toone
lane reduction.
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