A major incentive for the Arizona DPS of measuring TIM performance was to improve first responder safety. Towards this goal, the DPS conducted the SHRP2 TIM training in 2012. As part of their TIM performance measurement program, the Arizona DPS collects data not only on the occurrence of secondary incidents (specifically secondary crashes), but whether or not a first responder is involved in a secondary crash. Therefore, using their TIM performance data, the DPS could measure the impacts of the SHRP2 TIM training on the occurrence of secondary crashes involving a first responder.
The graphs shown in the figure below compare the percentage of secondary crashes in 2011 (before the SHRP2 TIM training) to those in 2013 (after the SHRP2 TIM training), as well as secondary crashes involving a first responder to those not involving a first responder.
The data shown in the graph indicate that the percentage of secondary crashes not involving a first responder actually increased over the3-year period (63 percent in 2011 and 73 percent in 2013). On the other hand, secondary incidents involving a first responder decreased over the same period (about 7 percent in 2011 before conducting the TIM training and only 2 percent in 2013 after conducting the TIM training). These findings suggest that the involvement of first responders in the TIM training resulted in fewer responders being involved in secondary crashes.