From this analysis, the TIM partners are able to determine that an over-representative percentage of secondary crashes occur during the morning and evening peak periods (more so during the evening) than during all other times of the day. This finding is not surprising in that there are more motorists on the roads during these time periods that could be involved in secondary crashes. However, this information could allow the partners to focus on the development of strategies that could be deployed during these times that might help reduce the occurrence of secondary crashes.
The analysis also shows that there is an over-representative percentage of secondary crashes that occur on Interstate Highway 1 and Interstate Highway 4, particularly Interstate Highway 4. This finding can steer the partners towards focusing on what attributes of these roadways might be impacting the occurrence of secondary crashes and how these might be overcome. In addition, the partners could conduct additional analyses for these roadways, using other roadway characteristics in the database (e.g., direction, milepost) to determine if there is one direction of flow and/or particular locations that are more susceptible to the occurrence of secondary crashes.
Finally, the partners could conduct additional analyses using other incident characteristics (e.g., weather conditions, severity of injury, number of lanes blocked, number of vehicles involved) to determine if there are other incident characteristics that tend to lead to more secondary crashes than others.
Click here for an example from the Arizona Department of Public Safety (AzDPS).