A signal is a safety-critical device that the public obeys without question, so its failure modes matter more than its downtime. The conflict monitor is the component that guarantees the intersection cannot display conflicting greens; if it has failed, the protection is gone and nothing indicates it. Detection loop failures are subtler — a signal that never sees waiting traffic on an approach teaches drivers to run it.
The steps ChatterFix schedules for this PM. Every step is a checkable item on the work order — a technician can speak their way through it without touching a keyboard.
A signal is a safety-critical device that the public obeys without question, so its failure modes matter more than its downtime. The conflict monitor is the component that guarantees the intersection cannot display conflicting greens; if it has failed, the protection is gone and nothing indicates it. Detection loop failures are subtler — a signal that never sees waiting traffic on an approach teaches drivers to run it.
The intersection functions normally until it does not, and the failure presents as a collision rather than as a fault. Dead battery backup means the intersection goes dark in a power cut, when traffic control is most needed. Water in a cabinet corrodes connections and produces intermittent faults that are extremely hard to diagnose after the fact.
Semi-annual full inspection with the conflict monitor tested at every visit; annual as an absolute minimum. Battery backup capacity should be load-tested rather than voltage-checked — a battery that reads fine can still have no useful runtime.
This procedure — and every other PM for your industry — is already built into ChatterFix. Pick your industry and it lands on the right equipment, on the right interval, in about three minutes.