| Source Element | Destination Element | Flow |
|---|
| City of Bristol TN Fire/EMS Vehicles | City of Bristol TN Traffic Signals | local signal preemption request |
| City of Bristol VA Traffic Signals | local signal preemption request |
| City of Bristol VA Fire Vehicles | City of Bristol TN Traffic Signals | local signal preemption request |
| City of Bristol VA Traffic Signals | local signal preemption request |
| VDOT Traffic Signals | local signal preemption request |
| City of Bristol VA Lifesaving Crew | City of Bristol TN Traffic Signals | local signal preemption request |
| City of Bristol VA Traffic Signals | local signal preemption request |
| VDOT Traffic Signals | local signal preemption request |
| Municipal/County Public Safety Vehicles | Town of Abingdon VA Traffic Signals | local signal preemption request |
| VDOT Traffic Signals | local signal preemption request |
| Washington County VA Public Safety Vehicles | Town of Abingdon VA Traffic Signals | local signal preemption request |
| VDOT Traffic Signals | local signal preemption request |