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16 20Inch Led Traffic Light
16-20 Inch(400-500MM) Led Traffic Lights is the inner part of our 16-20 Inch(400-500MM) led traffic lights.
The 16-20 inch (400-500 mm) LED traffic light is the high-visibility specification for expressways, major arterials, and visibility-critical intersections. It is required wherever the approach speed, approach distance, or background visual clutter demands a signal indication larger than the standard 12-inch head. Common deployments include expressway off-ramps, tunnel entrances, large signalised roundabouts, port and intermodal terminal gates, and major urban arterials with high truck volumes. GAOQIAO supplies 400 mm and 500 mm LED signal heads in 2-aspect, 3-aspect, and 4-aspect configurations, with photometric performance engineered for the most demanding visibility requirements.
Technical Specifications
| Parameter | Standard Range |
|---|---|
| Lens diameter | 400 mm (16") / 500 mm (20") |
| LED colors | Red, Yellow, Green, or any combination |
| Housing material | UV-stabilized polycarbonate or die-cast aluminum alloy |
| Operating voltage | AC 85–265 V, 50/60 Hz; DC 24/48 V optional |
| Power consumption | 18–25 W per aspect (3-aspect: 55–75 W total) |
| Visibility distance | 500 m (400 mm) to 700 m (500 mm) |
| IP rating | IP65 standard, IP66 optional |
| Working temperature | -40 °C to +70 °C |
| LED lifespan | 100,000 hours |
| Compliance | EN 12368, MUTCD (US), CE, RoHS, FCC, ISO 9001 |
How to Choose the Right 16-20 Inch Signal
The 16-20 inch head is specified by traffic engineer decision rather than by simple application class. Three situations justify the larger size:
- Expressway and high-speed arterial approaches: Where the design speed is 80 km/h or higher, the 12-inch head may not provide sufficient visibility margin at typical approach distances. The 16-20 inch head adds 200+ meters of read distance.
- Visual clutter backgrounds: Billboards, signage, building façades, and high-rise commercial areas create background distraction. A larger signal head maintains dominance in the driver's visual field.
- Heavy vehicle percentages: Where trucks and buses dominate the traffic stream, the signal must be readable from elevated cab positions and from longer following distances. The 16-20 inch head serves both.
A common mistake is specifying 16-20 inch for lower-speed applications purely on the basis of "bigger is better". This wastes budget and can actually be counterproductive, because the larger head may be visually overwhelming in a low-speed context and can lead to driver non-compliance through the perception that the signal is "not for me".
Key Features and Benefits
Maximum Visibility Optical Design
The 16-20 inch optical system uses a multi-element lens array optimised for 500-700 m visibility. Each indication is independently photometric-tested to EN 12368 or MUTCD standards, depending on destination market.
Heavy-Duty Construction
The die-cast aluminum housing is engineered for the larger lens area and the structural loads imposed by the wider mounting footprint. All aluminum components are chromate-converted and powder-coated for 10+ year outdoor durability.
Integrated Backplate
A standard 5 cm wide retroreflective backplate is included on all 16-20 inch heads, providing additional visual prominence in the approach field. The backplate also reduces sun-phantom false-signal risk on tropical deployments.
Common Applications
- Expressway on-ramps and off-ramps
- Major urban arterials (4+ lane roads with high truck volume)
- Tunnel entrances and exits
- Large signalised roundabouts (multi-lane approach)
- Port terminal gate control
- Intermodal freight yard signals
- Bridge and elevated highway approach signals
- Industrial mine and quarry vehicle control
For most urban intersections, see 12-inch (300mm) LED traffic light. For lower-speed applications, see 8-inch (200mm) LED traffic light.
Installation and Maintenance
The 16-20 inch head uses heavy-duty mounting hardware. Installation time: 40–60 minutes per head, requiring two technicians for safe lifting. Cable entry is bottom-gland with larger-diameter cable to handle the higher current draw. Maintenance: visual inspection every 12 months, photometric check every 3 years (the larger head is more visually critical and warrants more frequent verification). Module replacement is field-serviceable.
Certifications and Compliance
Standard documentation: EN 12368 test report (or MUTCD test report for US market), CE/RoHS/FCC, ISO 9001, photometric data, 3-year warranty. Country-specific certifications (SASO, INMETRO) on project basis. For US deployments, ITE-certified variants are available.
Why Choose GAOQIAO
GAOQIAO supplies 16-20 inch LED signal heads to expressway authorities, port operators, and major arterial projects in 60+ countries. Our 12,000 m² Nanjing facility produces 15,000 signal heads per month at peak, with engineering support for project-specific photometric verification. OEM/ODM above 100 units. See cooperation cases and company profile.
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