Procuring, Managing, and Evaluating the Performance of Contracted TMC Services
The number of agencies within a TMC also affects the management structure. There are different types of TMCs in terms of the number of agencies performing TMC operations. There are single-agency TMCs and joint -agency TMC. A single-agency TMC may be fairly straightforward where the agency is contracting directly with another firm/agency for TMC services. A joint-agency TMC is characterized by a coalition of several transportation agencies collaborating on multiple TMC functions. This latter type of TMC structure may have increased complexity resulting from the inter-relationships of the agencies. Understanding the roles and responsibilities of each agency is important to establishing how the management of the functions and staff need to be carried out.
One example of a multi-agency organizational structure is for the Houston TranStar TMC in Harris County, Texas (see Figure 5). Houston TranStar is a public-public partnership between the Texas Department of Transportation, Harris County, City of Houston, and Houston METRO transit agency. There is a TMC manager that is responsible for the management of the TranStar facilities. Each of the agencies in TranStar is responsible for different TMC functions (e.g., freeway traffic management, transit bus dispatch, arterial signal system control).
Figure 5. Example of TMC Organizational Chart – Houston TranStar
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