Traffic Signal Field Check Logger
Signal field inspection log — heads, visibility, ped features (APS), detection, cabinet and timing observations; offline with GPS export.
New signalized intersection inspection
ITE-style programs pair an annual comprehensive field check per intersection with conflict-monitor bench tests and rapid response for dark/flash events.
Field guide: Traffic Signal Field Check Logger
A signal in flash is an intersection running on its last safety net — the conflict monitor has taken over because something upstream failed. Field checks exist to catch the slower failures before that point: heads twisted by wind so drivers see the wrong approach's indication, dead detection that strands a side street at 2 a.m., pedestrian buttons that never place a call, cabinets standing open to weather and tampering.
This logger structures the walkaround an ITE-style annual inspection expects — heads, ped features (including APS audible and vibrotactile checks), detection behavior, cabinet condition and observed operation. 'Degraded' versus 'critical' matters operationally: a dead loop is a work order; dark or conflicting indications are an immediate dispatch and often a police-traffic-control event.
Field tips
- Watch one full cycle from each approach before logging 'normal' — stuck phases and skipped service reveal themselves only over a complete cycle.
- Press every ped button and wait for the walk: a button that clicks can still be electrically dead.
- A twisted head after a storm is urgent even if all lamps work — drivers on the wrong approach may be reading it.
Records are stored only in this browser (localStorage) — export regularly. This tool aids field documentation; it does not replace your agency's official inspection procedures or engineering judgment.
Traffic Signal Field Check Logger — Signal field inspection log — heads, visibility, ped features (APS), detection, cabinet and timing observations; offline with GPS export. Free, offline-first and GPS-aware: open it on any phone, log in seconds, and hand your GIS team clean GeoJSON.
About Traffic Signal Field Check Logger
A signal in flash is an intersection running on its last safety net — the conflict monitor has taken over because something upstream failed. Field checks exist to catch the slower failures before that point: heads twisted by wind so drivers see the wrong approach's indication, dead detection that strands a side street at 2 a.m., pedestrian buttons that never place a call, cabinets standing open to weather and tampering.
How to use Traffic Signal Field Check Logger
- 1Enter the intersection and tap 📍 GPS to pin the signalized intersection's exact location (or type coordinates).
- 2Work through the signalized intersection checklist — every field matches what a real inspection program records.
- 3Pick a condition on the Normal operation / Maintenance item / Degraded operation / Critical — dispatch scale; actionable findings are tallied automatically.
- 4Add notes and log the inspection — it saves instantly to your device, even with zero signal.
- 5Export the round as CSV for your asset system, GeoJSON for the GIS, or print a clean report.
Why use Traffic Signal Field Check Logger?
- ✓100% free, no sign-up — built for crews, not per-seat licences
- ✓Offline-first: records save to your device instantly and survive dead zones
- ✓One-tap GPS tagging with accuracy capture on every record
- ✓Exports CSV for asset systems, GeoJSON for GIS, and print-ready reports
- ✓Checklist and guidance aligned with ITE Traffic Signal Maintenance Handbook
Frequently asked questions
Why do traffic signals go into flash mode?+
The malfunction-management unit (conflict monitor) forces flash when it detects conflicting greens, voltage problems or controller faults — flash is the designed fail-safe, not the failure itself. Every flash event deserves a cabinet-level diagnosis; this log records the field side of that record.
What is an APS and what should I check?+
Accessible Pedestrian Signals convey walk intervals non-visually: a locator tone at rest, an audible walk indication, and a vibrotactile arrow on the button. Field check all three. A silent APS at a school or transit corridor is an ADA finding with real consequences, not a comfort item.
How can I tell if a detector loop is dead?+
Sit a vehicle on the loop during a quiet period: if the side street never gets served while the main stays green through multiple cycles, detection likely isn't calling. Constant-call (stuck) detection shows the opposite — the phase serves every cycle with no traffic. Both findings go to the signal shop with this log's timestamp.
Who is liable when a signal malfunctions?+
Agencies are generally protected when they can show a reasonable inspection and response program — documented checks, timely repairs, and records. A consistent, GPS-stamped field log like this is precisely the evidence those programs rest on. (This is documentation, not legal advice.)
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