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![]() In 2002 the Maryland State CHART highway incident management system facilitated a 28.6 percent reduction on the average incident duration leading to an estimated 377 fewer secondary incidents.
November 2003 Summary Information The CHART (Coordinated Highways Action Response Team) highway incident management program is a collaborative effort between the Maryland DOT State Highway Administration (SHA), Maryland Transportation Authority (MTA), Maryland State Police (MSP), Federal Highway Administration (FHWA), the University of Maryland, and several local governments. Initiated in the mid-1980s as the “Reach the Beach” program, the program was designed to support safe travel to and from Maryland’s eastern shore. By the year 2000, CHART operations became part of a regional advanced traffic management system for the Baltimore-Washington region. The regional system included a statewide operations center (SOC) and three satellite traffic operations centers (TOC) that were deployed to improve real-time operations on commuter routes. Recently, in cooperation with federal, state, and local agencies, CHART has expanded into a statewide system. At the time of this report, CHART consisted of the following operational components: traffic monitoring, incident response, traffic management, and traveler information (i.e., live traffic cameras, real-time traffic maps, weather, and local traveler information).
The overall objective of the CHART 2002 study was to assess the effectiveness of CHART/SHA operations. It was noted that an ideal comprehensive evaluation of incident duration would consider detection time, response time, and traffic condition recovery time; however, at the time of this study, the data on detection time and complete response time were limited. The impact analysis in this report was based primarily on incident data collected from MSHA patrols and Maryland State Police (MSP) reports.
* The authors noted that the reduction in duration for incidents without CHART response may be due to increasing attention to the value of reducing incident duration by all responding agencies. In 2002, there were 941 secondary incidents in the CHART coverage area. Based on the data collected, the study found that the cumulative number of secondary incidents increased with increased duration of primary incidents. In this study secondary incidents were defined as:
Given the finding that CHART contributed to a 28.6% reduction in the average incident duration, and assuming that the correlation between increased primary incident duration and increased secondary incidents was linear in nature, this study estimated that CHART operations resulted in 377 fewer secondary incidents in 2002. The impacts of CHART on delay and fuel consumption were estimated using the CORSIM traffic simulation software tool. The model estimated that CHART operations in 2002 resulted in a total delay time reduction of 29.98 million vehicle-hours and a total fuel consumption reduction of approximately 5.06 million gallons. The table below summarizes the estimated cost savings from reduced fuel consumption and decreased delay as a result of CHART operations from 1999 to 2002.
**The yearly increases in number of incidents reported are due in part to improved data quality. Goal AreasTypical Deployment LocationsStatewide Keywordsfreeway service patrol, courtesy patrols, highway helpers, freeway service patrols
ID: 2007-00425
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