GAOQIAO is a Chinese 4 inch (100mm) LED traffic light manufacturer with 17+ years of experience producing compact signal heads for parking access control, warehouse dock bays, factory internal traffic, toll booth lanes and similar applications where the smaller 100mm diameter is the right fit. Our 4-inch line is available in 1-aspect, 2-aspect and 3-aspect configurations, in 12-24 VDC or 110-220 VAC versions, with IP65 rated polycarbonate housings and 50,000+ hour LED module life. Browse the specifications below or contact us for project-specific guidance.
The 4-inch (100mm) diameter is the smallest of the standard traffic signal sizes. It is the right choice when:
| Parameter | Specification |
|---|---|
| Diameter | 100mm (4-inch) |
| Aspect count | 1, 2 or 3 aspect (red, yellow, green) |
| LED module | High-brightness 5mm LEDs, 50,000+ hour life |
| Housing | Polycarbonate, UV-stabilized, black or yellow |
| Lens | Optical-grade polycarbonate, anti-glare hood included |
| Voltage | 12-24 VDC or 110-220 VAC |
| Power consumption | 3-5W per aspect |
| IP rating | IP65 standard |
| Operating temperature | -40°C to +70°C |
| Mounting | Pole-mount bracket, gate-mount bracket or pendant mount |
| Certifications | CE, RoHS, IP65 |
At parking garage entries and exits, 4-inch 2-aspect (red/green) signals direct vehicle flow. Integrated with barrier gates and ticket dispensers, the system provides clear visual indication of access status. Browse traffic light controllers for the matching control system.
Inside warehouses and distribution centers, 4-inch signals coordinate truck and forklift traffic at loading bays. Red means bay occupied, green means bay available. The compact size and IP65 rating suit the indoor industrial environment.
For internal road junctions inside large factories, 4-inch 3-aspect signals at low mounting height (2-3m) control vehicle flow between buildings. The signals integrate with the factory's access control system.
At highway toll plazas, 4-inch signals above each lane indicate open (green) and closed (red) status. The compact size and clear visibility at short distance suit the toll booth application.
At intersections of haul roads with light vehicle roads in open-pit mines, 4-inch signals provide clear directional control. The signals pair with solar warning lights for the matching solar power system.
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A 4-inch (100mm) LED traffic light is the smallest standard traffic signal size, used in compact and access-control applications where viewing distance is short (under 50 meters). Common uses include parking gate entries, warehouse loading dock bays, factory internal traffic lanes, mine haul road crossings and toll booth lanes. The smaller size reduces wind load and visual intrusion while keeping hardware cost low.
Generally no — most national standards (MUTCD in the US, EN 12368 in Europe) require 200mm or 300mm signal heads for public road vehicle signals. 4-inch heads are permitted for pedestrian signals, lane control, gate control and similar supplementary uses. For public road vehicle signals, choose 200mm or 300mm.
GAOQIAO 4-inch LED traffic lights are available in 12-24 VDC and 110-220 VAC versions. The 12-24 VDC version is the most common for solar-powered access control and parking gate applications; the 110-220 VAC version is standard for mains-powered industrial sites.
GAOQIAO 4-inch LED traffic lights use high-brightness 5mm LEDs with a rated life of 50,000+ hours. In typical access control duty (12-16 hours per day), this corresponds to 8-12 years of operation before LED replacement is needed. The housing is rated for 10+ years of outdoor service life.
The 4-inch (100 mm) LED traffic light is used for pedestrian crossings, parking lot exits, factory internal aisles, school zone crossings, and low-speed urban intersections where the approach speed is below 30 km/h. It is not recommended for arterial roads, where the larger 200 mm, 300 mm or 400 mm lens is required by international road authority standards.
A single 4-inch LED aspect consumes approximately 6 to 9 watts depending on color and LED count, which is roughly 85% less than an equivalent incandescent 4-inch signal. With three aspects in a typical red-yellow-green stack, total power consumption is 18 to 27 watts. This efficiency allows the unit to run on solar power in remote pedestrian crossings without grid connection.
Yes. We offer a low-voltage 24 V DC variant of the 4-inch traffic light that is widely deployed in factory aisles, warehouse lanes, and AGV/AMR traffic zones. The housing is impact-resistant polycarbonate and the unit can be surface-mounted, hung, or pole-mounted with the standard GAOQIAO bracket system. Optional audible buzzer and flashing mode are available for high-noise environments.
About GAOQIAO — Nanjing Gaoqiao Traffic Technology Co., Ltd. is a Chinese LED traffic light manufacturer with 17+ years of export experience. For larger signal sizes, see the 300mm (12-inch) line or the 400-500mm highway line. For international traffic signal standards guidance, see the EN 12368 standard.
This section summarizes the most common commercial and technical questions that importers, contractors and government procurement officers ask before issuing a purchase order for 4-inch led traffic light systems from GAOQIAO.
GAOQIAO products are designed to meet the most widely adopted international road, traffic and electrical safety standards. Our factory is audited annually by TÜV, SGS and BV.
For tender submissions, GAOQIAO provides pre-filled compliance matrices, type-test reports, photometric files, and CAD drawings within 3 working days of request.
GAOQIAO 4-inch led traffic light systems have been deployed in 60+ countries. The following are the most common deployment scenarios our project team encounters.
For each scenario, GAOQIAO can share anonymized case studies with photos, drawings, and measured performance data on request.
With proper preventive maintenance, the operational lifetime of a GAOQIAO 4-inch led traffic light typically exceeds 10 years. The following schedule reflects the experience of our field service team across more than 60 countries.
GAOQIAO offers annual maintenance contracts and on-site technician training for distributor networks. Spare-part kits for the first 3 years of operation are bundled with every shipment at no additional cost.
Last updated: 2026-06-29 — This page is reviewed weekly by the GAOQIAO team.
Questions about the latest specs or want a custom quote? Contact our engineering team.