Traffic Signal Preventive Maintenance Schedule and Checklist
Introduction
A preventive maintenance program extends signal life, reduces crashes and lowers lifetime cost. The schedule below is a starting point; adjust to local conditions and the authority's own policy.
Daily Checks (Visual, 5 minutes)
- All signal heads lit, no dark lamps
- No conflicting greens visible from any approach
- No visibly damaged signal head, pole or cabinet
- No conflicting indications within the same signal head
A simple drive-by inspection catches the majority of urgent issues.
Monthly Checks (15 minutes)
- Cabinet door secure, locks functional
- Cabinet interior clean, no water or vermin
- No unusual noise from the cabinet fan
- Detector response on each approach (driving or with a hand tool)
- Pedestrian push buttons responsive
Quarterly Checks (1-2 hours)
- Lamp intensity check (visual comparison to a known-good head)
- Conflict monitor test (per the pre-printed test sheet)
- Surge arrestor visual inspection
- Earth rod resistance check
- Battery state of charge (solar systems)
- Cleaning of cabinet filter
- Cleaning of signal head lenses
- Tightening of all accessible terminals
Annual Checks (4-8 hours per intersection)
- Full conflict monitor test with certification
- Lamp-hour counter reading (replace LED modules approaching end of life)
- Earth rod resistance test with certificate
- Foundation crack survey
- Pole and signal head structural inspection
- Detector calibration (re-tune video/radar detection)
- Communication system test (central system)
- Update of as-built drawings with any changes
- Spare parts inventory check
- Re-lamp with spare modules (planned replacement at 80% of rated life)
GAOQIAO can supply a maintenance contract template and a spare parts package matched to the network size.
Featured Products
GAOQIAO supplies spare LED modules, conflict monitors and maintenance checklist templates.
Conclusion
A documented preventive maintenance program catches 90% of issues before they cause signal failures. GAOQIAO supplies templates and spare parts. Send us your network size for a maintenance package.
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Frequently Asked Questions
How often should the conflict monitor be tested?
Annually for most authorities, more often for high-criticality intersections.
What is the typical annual maintenance cost per intersection?
$200-500 per year per intersection, depending on labour cost and traffic volume.
Can GAOQIAO provide remote monitoring?
Yes, optional 4G remote monitoring with battery voltage, load status and alarm alerts. Compatible with most SCADA systems.
Relevant GAOQIAO products
These public GAOQIAO catalogue pages are related to the guide. Open them for the representative description, then confirm the latest drawing and configuration before ordering.
- Traffic signal controllersWired and solar controllers with 6, 22, 44 and 56 output options.
- LED traffic signal heads200mm, 300mm and 400mm signal heads with MUTCD, EN12368, GB14886 compliance.
- Signal polesVertical, signal arm and double-arm poles for any intersection geometry.
- Spare parts and accessoriesSpare LED modules, lenses, visors, surge arrestors and anchor bolts.