| Source Element | Destination Element | Flow |
|---|
| Local Emergency Vehicles | Lacey ITS Roadway Equipment | local signal preemption request |
| Olympia ITS Roadway Equipment | local signal preemption request |
| Tumwater ITS Roadway Equipment | local signal preemption request |
| WSDOT ITS Roadway Equipment | local signal preemption request |
| Transit Vehicle OBE | Lacey ITS Roadway Equipment | local signal priority request |
| Olympia ITS Roadway Equipment | local signal priority request |
| Tumwater ITS Roadway Equipment | local signal priority request |
| WSDOT ITS Roadway Equipment | local signal priority request |