The vision for the CHART deployment strategy includes implementing appropriate roadway devices, computer systems, telecommunications, and operational capabilities to respond to existing conditions on freeways and major arterial roads in the state of Maryland based on the above ITS concepts. Significant research and statistical analysis has defined these existing conditions in terms of traffic volumes, future anticipated increases, and the nature and quantification of both recurring and non-recurring congestion on approximately 550 miles of roadway around Maryland’s metropolitan areas. It has been determined that roughly 70 percent of this roadway experiences significant recurring congestion. Some capability has already been deployed. This includes:
Establishment of a SOC staffed around-the-clock
Establishment of three regional TOCs, including the Montgomery County Transportation Management Center (MCTMC), and two seasonal TOCs
Development and test of Freeway Incident Traffic Management (FITM) plans for major freeways
Strategic positioning of twelve SHA incident response vehicles
Activation of 300+ traffic detector stations, 20+ CCTV surveillance cameras, and 50+ traveler information devices
A Maryland State Police (MSP) staffed cellular incident call-in system (cellular #77)
Off-line systems to disseminate information to the media and public
Both communications and non-communications requirements–to the extent they affect CHART communications–are presented in this section. Non-communications requirements include ITS program and system components in general, ITS device identification and placement, chronology and timing for installation of these devices, identification of SHA and other State facilities that are a part of the CHART program, regional geography considerations, and the expected manner of utilization by CHART operators and stakeholders.
2.1 CHART Requirements Sources
No single document can be identified as the comprehensive source of CHART requirements. CHART communications requirements have been derived from several sources including current CHART program documentation, strategic planning materials and activities, CHART Use Case interviews, related study reports, and periodic CHART Communications Working Group meetings. This section will identify sources of high-level CHART requirements from which CHART communications requirements have been derived.
2.1.1 Historical Information
A review of historical information pertaining to the CHART program goals and objectives was performed. The purpose of the review was to achieve consensus on CHART functional requirements and succinctly document them for the benefit of prioritizing and evaluating CHART communications needs.
The CHART program continues to evolve from early efforts to improve travel to and from Maryland’s Eastern Shore. The early program focused on incident management