Smart Zebra Crossing Projection System – Construction Case Study
Smart Zebra Crossing Projection System – Construction Case Study
BERTIN LIGHTING | WWW.BERTINLIGHTING.COM
1. Project Background
Location: Intersection of arterial and secondary roads in a provincial capital city
Surroundings: Large residential community, elementary school, commercial complex, multiple bus stops
Pre-renovation Issues:
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67% of traffic accidents occurred at night
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42% accident increase in rain/fog conditions
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~30% of pedestrians crossed while using phones
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Nighttime vehicle yielding rate below 35%
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Zebra crossing illuminance only 60% of standard value
Objectives: Enhance nighttime and adverse-weather visibility, strengthen two-way warnings, reduce accidents, increase yielding rates, and collect traffic data.
2. Site Survey
| Parameter | Data |
|---|---|
| Intersection Type | Cross intersection |
| Lanes | 6 lanes (both directions) |
| Zebra Crossing Length | 18 meters |
| Zebra Crossing Width | 5 meters |
| White/Black Stripe Width | 45cm / 55cm |
| Daily Pedestrian Flow | 8,500 persons |
| Daily Vehicle Flow | 32,000 vehicles |
| Installation Method | Forward vertical projection |
| Installation Height | 7.5 meters |
3. Product Selection
Core Configuration:
| Equipment | Specification | Qty |
|---|---|---|
| Smart Projection Light | 800W light source / 1000W total | 2 units |
| Smart Control Cabinet | PLC + 4G module | 1 set |
| Sensor Kit | Light + Temp/Humidity + Rain | 1 set |
| Signal Collector | Traffic light acquisition module | 1 set |
| Mounting Columns | Galvanized steel, 8m height | 2 poles |
Key Principle: Always prioritize brightness over coverage area. Insufficient brightness renders projections invisible during daytime, defeating their warning purpose.
4. Installation (7 Days)
| Phase | Duration | Key Tasks |
|---|---|---|
| Site Re-measurement | 1 day | Precise positioning, deviation ≤ ±5cm |
| Foundation Pouring | 2 days | Pit φ0.7m×0.7m depth, C30 concrete |
| Column Installation | 1 day | Levelness error ≤ 2mm |
| Cabling | 1.5 days | RVV 3×4mm² power + fiber/4G redundant links |
| Wiring & Debugging | 1 day | Signal acquisition + equipment wiring |
| System Integration | 0.5 days | Full function test & acceptance |
Signal Wiring Essentials:
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Acquire traffic light power line voltage (AC 220V) from signal cabinet
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Connect via opto-isolator for safety
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Green ON → Green projection (Walk); Red ON → Red flashing (Don't Walk)
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5-second signal loss → Auto safe mode (slow yellow flashing)
5. Commissioning & Acceptance
Calibration Items: Level calibration, alignment (deviation ≤ 2cm), focus calibration, brightness & color calibration
Test Results:
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Signal response: ≤ 156ms
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Sensor trigger: ≤ 0.8 sec
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Remote control: ≤ 1.2 sec
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Driver recognition distance: ≥100m (daytime), ≥200m (night)
6. Performance Data
Accident Data Changes:
| Indicator | Before | After | Change |
|---|---|---|---|
| Night accidents (monthly avg) | 3.7 | 0 | -100% |
| Adverse weather accidents (monthly avg) | 2.3 | 0.5 | -78% |
| Pedestrian injury accidents (monthly avg) | 2.0 | 0 | -100% |
| Nighttime yielding rate | 32% | 78% | +144% |
| Phone-users running red light | 12/hr | 3/hr | -75% |
User Satisfaction: 4.7/5.0
7. Key Takeaways
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Precise surveying is foundational – cm-level accuracy achieves 98%+ alignment with existing stripes
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Over-specify when in doubt – one power grade higher ensures daytime visibility
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Standardized installation ensures longevity – proper labeling, terminal crimping, waterproof sealing
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Close coordination with traffic authorities – signal acquisition must be compliant and safe
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Design for maintenance from day one –预留 access, spares, and remote diagnostics
8. FAQs
Q: Visible in direct sunlight?
A: Yes. The 800W high-brightness unit remains clearly visible even at noon on sunny days.
Q: Does it cause glare for drivers?
A: No. Projection is directed at the road surface, and brightness automatically reduces at night.
Q: Is internet connectivity required?
A: It can run independently, but cloud connectivity enables remote monitoring, data collection, and firmware upgrades.
Q: What is the lifespan?
A: LED light source: 50,000 hours (approx. 5.7 years continuous use).
Q: Operates in heavy rain?
A: IP65-rated. Rain triggers automatic brightness boost and red warning mode.
Conclusion
Through professional surveying, precise product selection, standardized installation, and rigorous commissioning, this project transformed a high-accident intersection into a safe and efficient traffic node. BERTIN LIGHTING remains committed to intelligent lighting control technology, safeguarding every journey with professional-grade illumination.
BERTIN LIGHTING
Website: WWW.BERTINLIGHTING.COM
