As TIM programs have matured, some agencies have begun to formalize their performance measures, utilizing or adding to the nationally recommended measures. As one example, in 2006, the Florida Department of Transportation (FDOT) recommended the use of four primary performance measures that could be implemented in the short-term with existing data collection capabilities. These performance measures included:
- Response time.
- Roadway clearance time.
- Incident clearance time.
- Incident duration.
The formalization of FDOT’s TIM program evaluation arose from the need to:
- Improve the effectiveness of the program and enable tracking improvements.
- Serve as a basis for upper management support, which affects the funding available for TIM activities.
- Foster public support of the program.
- Satisfy increased federal emphasis in operations and management.
FDOT’s discussion emphasizes the concern about performance measures because of the need for accountability to the state legislature, the Florida Transportation Commission, and the public. In addition to the measures that could be formalized immediately, the following measures were recommended for long-term development as the data collection capabilities evolved:
- Recovery time.
- Incident influence time.
- Incident-related delay.
- Secondary incident rate.
It was recognized that several additional challenges, such as links to the Florida Highway Patrol (FHP) Computer Aided Dispatch (CAD) data would be necessary to fulfill the vision of cataloging these performance measures in the longer term (8).