- Requirements Sources
The CSC/PBFI Team derived the total set of requirements in the Appendix B table from several sources.
220.127.116.11 MDSHA’s CHART II Functional Requirements
These are the requirements specified in the MDSHA CHART II Software Functional Requirements document and accompanying cover letter. Each line of the document was analyzed and an exhaustive set of requirements developed and classified according to their type.
18.104.22.168 Derived Requirements
In addition to the functional requirements provided by MDSHA, the team obtained additional first hand information by speaking to the system users and potential users. Telephone interviews and site visits were conducted to develop an understanding of the operations of the current system. We identified which functions will work well for the MDSHA and which will not. Discussions also led to an understanding of the system capabilities that improve operator efficiency. In addition, the possibility of sharing information with other agencies was investigated.
The following is a list of the telephone interviews, site visits, prototyping sessions, and working group meetings that were conducted, with a brief description of the purpose of the meeting and the individuals involved.
22.214.171.124.1 Telephone Interviews
Telephone interviews were held with the following:
- Maryland State Police - A telephone interview was conducted with Lieutenant C.D. Tyler to discuss what the Maryland State Police are currently doing in terms of traffic and incident management, and what they would like to do in the future.
- MDSHA Signal Group - A telephone interview was conducted with Mr. Bob Snyder and Mr. Ed Rodenhizer of the Maryland State Highway Administration.
126.96.36.199.2 Site Visits
The following site visits were completed:
- SOC - The CSC/PBFI Team joined the Lockheed Martin Team in a tour of the SOC. During the site visit, the different systems being used in the SOC were discussed, and an explanation of current needs provided. To build upon this knowledge, the team visited the SOC for two full days and observed the system operators as they performed their duties. Discussions with the operators provided insight into how they would like the new system to operate.
- TOC3 - Mr. Dale Lineweaver led a tour of TOC3. The practices of the system operators were observed. This site visit provided an understanding of the differences between the responsibilities of the SOC and the TOCs. In addition, an understanding of the interaction with the State Police was observed.
- TOC4 and AOC - Mr. Dale Lineweaver led a tour of TOC4 and the AOC. This site visit provided additional information about the responsibilities of a TOC as well as on communications and incident handling. It became clear that operators have different preferences for maintaining incident information.
- Howard County - A site visit was held with Mr. George Frangos and Mr. Brian Muldoon of Howard County. Their current requirements are minimal since they do not have infrastructure in-place to support the communications and data sharing with the CHART II system.
- VDOT Freeways - A site visit with Mr. Jimmy Chu was conducted. VDOT has a considerable amount of data that would be useful to the CHART II system. They are currently considering integration with several other systems, including CHART II.
- VDOT Signals – The Northern Virginia Traffic Signal System was developed by PB Farradyne using PBFI’s Management Information System for Transportation (MIST®) platform. PBFI’s project manager for the Northern Virginia project, Mark Thompson, will also serve on the system engineering team for the development of CHART II. Therefore, the CSC/PBFI Team will be able to easily develop the communications link to allow data sharing between the two systems.
- Montgomery County - A site visit was conducted with Mr. Bruce Mangum. Montgomery County has a well-developed system that collects some very useful data. They are very interested in sharing information with CHART II.
- Partners in Motion (PIM) - A site visit was conducted with Ms. Karen Miller and Ms. Carole Zimmerman of Battelle. The PIM system collects regional transportation information. They are very interested in the possibility of sharing data with CHART II.
- MdTA - A site visit was conducted with Mr. Bob Jordan of MdTA. The MdTA is planning to upgrade their system, and they are considering making the functionality of their new system consistent with CHART II. They are interested in sharing information, but do not want to lose any operational control.
- MDSHA Planning - A site visit was conducted with Mr. Jeff Smith, Mr. Mike Baxter, Mr. Jerry Einolf, and Mr. Carl Hess. The MDSHA Planning group is very interested in using speed, volume, and occupancy information from CHART II detectors for transportation planning purposes.
Three prototyping sessions were held with MDSHA at the CSC offices. The purpose of these sessions was to foster a cooperative atmosphere between system users and developers. As a result of these sessions, the system operator interface was modified several times, as agreed upon by MDSHA and CSC/PBFI personnel. Operator interface requirements were continually modified as the prototyping sessions evolved.
188.8.131.52.4 CHART Working Group Meeting
The CHART working group meeting was held at the SOC Training Room on March 9, 1998. It provided an opportunity to gather stakeholder input regarding system interfaces and functions that will affect CHART II in the long term. Based on the working group meeting, requirements were modified and additional ones identified.