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71 however, interconnected communication between all the sig- are a result of increased competition. The retiming projects nals could further improve coordination strategies on several have successfully reduced travel times, fuel consumption, and of the corridors. At the time this report was prepared, an esti- emissions, which has created a positive overall benefit-cost mated 50% of the 7,500 signals were interconnected. The cost ratio for the region. to expand communication would be approximately $10,000 The local agencies are provided with opportunities for per project. One recommendation is to develop a program funding and engineering expertise that would not have been that would fund the installation of interconnected equip- possible otherwise. With the approval of their project, MTC ment. Until those funds are made available, the region will may hire additional consultants to help smaller communities continue to pursue the use of GPS/time clocks to manage cor- with review of the signal plans. The project team typically has ridors within multiple jurisdictions. great communication between each other and clear goals for MTC is constantly under political restraints and cost limita- each project. tions for all their programs. One MTC strategy (7) is to analyze the regional needs for projects that meet the needs for multiple References programs, such as "Safe Routes to School" or transit (9). Fund- ing for each of the identified programs could be pooled to 1. Swart, N. National Vision and ITS in Maricopa County. IMSA Jour- nal, May/June 2005, pp. 6466. address regional needs and not just specific components. 2. AZTech. Data Exchange with Public Safety. www.aztech.org/ Singleagency-operated corridors affecting multiple agen- trafmgmt/data_exc.htm. Accessed July 20, 2010. cies need to further develop institutional and technical work- 3. Kimley-Horn and Associates, Inc. AZTechTM Transportation and Pub- ing environments. This coordination includes the involvement lic Safety Center-to-Center Needs Assessment and Concept of Opera- of transit agencies to improve the flow of transit vehicles on tions: Final Report. Maricopa County Department of Transportation, Phoenix, Ariz., 2005. congested routes. Improved coordination also supports MTC's 4. OZ Engineering. Emergency Management System Center-to-Center goal of elevating transit and light rail to a higher priority in Interface Module, Phoenix Fire Dispatch System Design, rev. 1.0. the region. Maricopa County Department of Transportation, Phoenix, Ariz., Finally, if a region pursues the development of a program 2006. similar to the RSTP, it is important to develop clear guidelines 5. Research and Innovative Technology Administration. NTCIP 2306-- Application Profile for XML Message Encoding and Transport in ITS on how to implement and manage the program. These guide- Center-to-Center Communications (C2C XML). U.S. Department of lines will build credibility for the program because all parties Transportation, 2009. www.standards.its.dot.gov/fact_sheet.asp?f= will see consistent treatment of similar scenarios. These guide- 91. Accessed July 20, 2011. lines also will guide participants on how the program can sup- 6. Metropolitan Transportation Commission. Arterial Operations. port their operations. www.mtc.ca.gov/services/arterial_operations/index.htm. Accessed July 20, 2011. 7. Arterial Operations Committee. Arterial Operations Program Update to the Planning and Operations Committee. Metropolitan Transportation Analysis and Research Observations Commission, Oakland, Calif., 2005. The MTC RSTP helped provide assistance and expertise for 8. California Department of Transportation. Life-Cycle Benefit-Cost Analysis Model. www.dot.ca.gov/hq/tpp/offices/ote/benefit.html. retiming traffic signals. MTC has retained a large pool of con- Accessed July 20, 2011. sultants for the signal timing projects. Because of the larger 9. Caltrans Division of Local Assistance. Safe Routes to School Pro- pool of candidate consultants, MTC is able to benefit from grams. www.dot.ca.gov/hq/LocalPrograms/saferoutes/saferoutes greater levels of expertise in the region and lower costs, which .htm. Accessed July 20, 2011.