In North Carolina, a modeling study indicated that work zone delay messages reduced maximum traffic backups by 56 percent and contributed to 55 percent reduction in traveler delay.

Using a traveler information to reduce congestion at work zones in North Carolina

11-15 January 2004.
Statewide; North Carolina; United States

Summary Information

In this study, the QuickZone traffic analysis tool was used to compare traffic conditions with and without the provision of real-time work zone traffic information at a representative two-mile work zone on I-95 in North Carolina. The system evaluated was designed to monitor traffic conditions in real-time, determine expected traffic delays, and advise motorists of current delays and alternate route information using portable dynamic message signs (DMS) and an Internet Web site. The goal was to reduce demand in the work zone during periods of heavy congestion.

The rehabilitation project covered a 19-mile section of I-95 and included multiple work areas. The design and size of each active work area was dependent on the location of detour routes, and need for lane closures and traffic controls. The segment of the work zone selected for analysis in this study was located between Milepost 150 and Milepost 154, and was about two miles long.

Baseline conditions were modeled using traffic information provided by the North Carolina DOT and traffic pattern data derived from the Highway Capacity Manual. To compare traffic conditions with and without ITS, two identical construction phases were simulated for one week each, with the only difference being the presence of ITS.


The results of the analysis indicated that when real-time work zone traffic information was provided; the maximum queue length decreased from 2.94 miles to 1.3 miles, maximum traveler delay decreased from 14.8 minutes to 6.6 minutes, and total user delay decreased from 21,955 hours per week to 5,476 hours per week—a reduction of 16,480 hours.

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Estimating the Benefits of Deploying Intelligent Transportation Systems in Work Zones

Author: Bushman, R., and C. Berthelot

Published By: Paper presented at 83rd Annual Meeting of the Transportation Research Board. Washington, District of Columbia

Source Date: 11-15 January 2004.


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Benefit of the Month for March, 2007 !

Goal Areas



Dynamic Message Signs, CMS, VMS, Changeable Message Signs, Variable Message Signs, construction warning signs, Portable Dynamic Message Signs, portable CMS, portable VMS, portable Changeable Message Signs, portable Variable Message Signs, Temporary Dynamic Message Signs, Temporary CMS, Temporary VMS, Temporary Changeable Message Signs, Temporary Variable Message Signs, smart work zone systems, smart work zone, smart work zones, Smart work zones, workzone, WZ

Benefit ID: 2007-00326