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Impact of Lane Closures on Roadway Capacity, Phase 2

Contracting Agency: Florida Department of Transportation
Principal Investigator: Dr. Scott Washburn

In a preceding project, “Impact of Lane Closures on Roadway Capacity” (BD-545, RPWO #61), a new procedure for analyzing two-lane, two-way, highways with a lane closure was developed to replace the existing procedure in Chapter 10 of the FDOT Plans Preparation Manual.  The replacement procedure was based strictly on the results of simulation.  As a result, some of the assumed factor values used in the simulation program may not be completely representative of Florida work zone conditions.  Thus, it is desirable to calibrate and validate the lane closure analysis procedure with field data.  The initial methodology also did not account for the effect of grade on the vehicle performance through the work zone area.


Also, as part of the preceding project, a new method was developed to determine the proportion of existing traffic that would divert to alternative routes during construction (referred to as the Remaining Traffic Factor [RTF]).  This method was based on the results from a stated preference survey.  Again, it is desirable to calibrate and validate this procedure against field data.

The objectives of this research project are to: 1) update/revise the two-lane, two-way, highway with a lane closure analysis procedure as necessary based upon data collected from field sites; 2) incorporate the effect of grade into the analysis methodology; and 3) assess the accuracy/validity of the RTF methodology developed in the preceding project based upon field data.


Big Media Studios
Transportation Research Center
Lily Elefteriadou, Ph.D., TRC Director
University of Florida Civil & Coastal Engineering
512 Weil Hall | PO Box 116500 | Gainesville, FL 32611-6580
352.392.9537, Ext. 1409
University of Florida
Last Updated 10/7/2013