To understand the occurrence of incidents on the corridor, the AMS team performed a cluster analysis (grouping like items together in the same basket or "cluster") on the I-210 freeway to determine the distribution of incidents: their frequency, location, severity, and duration. In Phase 1, this information was then used to select a common incident type to simulate on the Phase 1 test area and carry through each step of the AMS methodology. In Phase 2, the cluster analysis will be used to build a family of scenarios that together are representative of corridor operations.
The following figure illustrates incident severity. The impact of an incident on traffic is closely related to the number of mainline lanes closed and the duration of the closure. The graph displays the distribution of incident severity according to those criteria. Note that the most common situation is when one lane is blocked for about 30 minutes.
Complete details on the incident selection process in AMS Phase 1 can be found in the AMS Phase 1 Report.