Illustrative excerpt from
openits-signal-control.yang. The full model is the normative source.
View source ↗signal-control
CORE · WIREDActuated signal controllers: the model for phases, detectors, coordination, preemption and priority.
Namespace
urn:openits:yang:signal-control
Latest revision
2026-07-21
Data model
The configuration and state tree. Safety constraints are expressed as YANG must and validated at every boundary.
container signal-controller {
// operating mode of the intersection
leaf mode { type operation-mode; } // free|coordinated|flash|preempt
leaf cycle-length { type uint16; units "seconds"; }
list phases {
key "id";
leaf id { type phase-id; }
leaf state { type phase-state; } // green|yellow|red|walk|ped-clear
leaf min-green { type decimal64; }
must "yellow >= 3.0 and red >= 3.0 and min-green >= 5.0" {
error-message "MUTCD minimum timing";
}
}
}
Notifications & events
Each event is its own typed notification with its own ce-type. Consumers filter by subject before parsing.
comm-health-event
openits.signal-control.comm-health-event.v1
comm
controller-fault-event
openits.signal-control.controller-fault-event.v1
fault
coordination-change
openits.signal-control.coordination-change.v1
coordination
detector-report
openits.signal-control.detector-report.v1
detector
detector-transition
openits.signal-control.detector-transition.v1
detector
fault-cleared
openits.signal-control.fault-cleared.v1
fault
fault-raised
openits.signal-control.fault-raised.v1
fault
mode-changed
openits.signal-control.mode-changed.v1
mode
operational-status-report
openits.signal-control.operational-status-report.v1
operational
overlap-change
openits.signal-control.overlap-change.v1
overlap
pedestrian-event
openits.signal-control.pedestrian-event.v1
pedestrian
phase-state-change
openits.signal-control.phase-state-change.v1
phase
plan-applied
openits.signal-control.plan-applied.v1
plan
preemption-activated
openits.signal-control.preemption-activated.v1
preemption
preemption-cleared
openits.signal-control.preemption-cleared.v1
preemption
preemption-event
openits.signal-control.preemption-event.v1
preemption
tsam-mode-changed
openits.signal-control.tsam-mode-changed.v1
mode
tsam-recommendation-applied
openits.signal-control.tsam-recommendation-applied.v1
tsam
tsp-event
openits.signal-control.tsp-event.v1
tsp
unmapped-event
openits.signal-control.unmapped-event.v1
unmapped
Event families:
comm
coordination
detector
fault
mode
operational
overlap
pedestrian
phase
plan
preemption
tsam
tsp
unmapped
Subject & bindings
# canonical subject (reference CloudEvents binding)
openits.us-tx.txdot.d07.signal-control.i35-exit-214.comm-health-event
Schema registry
Every revision is immutable and content-addressed. Cite the exact date in ce-dataschema; there is no latest alias.