In Washington DC an ITS work zone program implemented on I-295 decreased delay up to 90 percent with an average decrease in delay of 52 percent when drivers were advised to take alternate routes.
The study analyzed data from five sites:
- District of Columbia
- North Carolina
District of Columbia Site Case Study
In 2006, the District of Columbia Department of Transportation (DDOT) deployed an ITS work zone system on I-295 during construction of approximately seven miles of roadway. The main goals of the system were to monitor conditions and improve mobility and safety through the work zone. The system incorporated a real-time information system for motorists and via a Web site. System components included, dynamic message signs, speed sensors, system detection and video cameras.
Traffic data were collected and archived from installed system detectors for nine months prior to and during construction. Historical data were used to establish a baseline prior to system implementation. Sensor data and observations were used as data sources for analysis. Traffic queues, volumes and diversion patterns were analyzed as methods of performance measurement.
The real-time information system deployed on I-295 appeared to effectively divert traffic to unsigned, unspecified alternate routes during times of significant congestion. One analysis performed on two similar Tuesdays, one before construction and one after, found the volume levels were almost exactly the same with the exception of the time period from approximately 10 AM until 1 PM when the system posted delay information and recommended that motorists seek an alternate route. During this time period the data showed a 3 to 89 percent decrease in mainline volumes, with an average of 52 percent decrease in delay. These results show that the system likely reduced delay substantially for motorists by providing information to better enable them to choose an alternate route.
These results are also found in the document - Benefits of Using Intelligent Transportation Systems in Work Zones: A Summary Report, Federal Highway Administration, April 2008. http://ops.fhwa.dot.gov/wz/its/wz_its_benefits_summ/index.htm
Published By: FHWA
Source Date: October 2008
EDL Number: 14419
Other Reference Number: FHWA-HOP-09-002URL: http://www.ops.fhwa.dot.gov/wz/its/index.htm#its
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