01 · Not detected
Events outside the node's field of view or beyond ultrasonic range.
Slow-developing hazards: potholes forming, structural damage, ice.
Anything requiring identification of a vehicle or person — deliberately out of scope.
02 · Degraded conditions
Heavy rain, fog, and glare reduce vision confidence. Night performance depends on ambient street lighting.
Gas readings drift with temperature and humidity and are treated as indicative, not quantitative.
Ultrasonic ranging is unreliable against soft or angled surfaces.
03 · Human in the loop
Every critical incident is confirmed by an operator before any external action.
The network reports conditions. It does not control signals, barriers, or traffic.