A key part of validating RPM system models and operating software is the ability to test the performance of the processes they perform. The simulator, developed by PNNL researchers and located in an adjacent building, is capable of creating traffic scenarios for up to 32 lanes. This allows scientists to challenge the software with more traffic and alarms than would be found in the field. The simulator also is valuable for troubleshooting problems. By feeding trouble-call data into the simulator, “state of health” evaluations of the RPM systems can be quickly performed.