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Latest National Standard for Expressway Street Lighting (2026 Current Complete Edition)
Latest National Standard for Expressway Street Lighting (2026 Current Complete Edition)
Currently, expressway street lighting in China follows the most recently effective mandatory national standard and its supporting recommended standards as of 2026. The core implementing document is GB 37478-2025 "Energy Efficiency Limits and Energy Efficiency Grades for LED Luminaires Used in Road and Tunnel Lighting" (officially implemented on June 1, 2026, replacing the 2019 version), supplemented by GB/T 31832-2025 "Technical Requirements for LED Urban Road Lighting Applications" and T/CCTAS 219-2025 "Technical Requirements for Road Longitudinal Lighting," forming a complete regulatory framework for expressway street lighting. Below are the key standard details specifically applicable to expressway scenarios.
I. Core Mandatory Energy Efficiency Standard (GB 37478-2025 – Mandatory Implementation)
Rated Correlated Color Temperature (CCT)
Level 1 Energy Efficiency (Highest)
Level 2 Energy Efficiency
Level 3 Energy Efficiency (Mandatory Minimum) Applicable scenarios
3500K to 5000K (high-speed preferred neutral white light) ≥175lm/W
≥155lm/W
≥130lm/W
Highway and expressway main roads (standard selection)
2500K to 3500K (warm white light) ≥165lm/W
≥145lm/W
≥120lm/W
High-speed service area, interchange ramps
>5000K (cool white)
No grading
No grading ≥150lm/W
Use with caution, as it may cause glare and visual fatigue.
II. Optical Parameter Standards for High-Speed Roadway Lighting (GB/T 31832-2025)
- Average pavement luminance: ≥1.5 cd/m²; at tunnel entrances/exits and interchange sections, increase to ≥2.0 cd/m² to ensure clear visibility during high-speed driving
- Glare control: Threshold Increment (TI) ≤10%; use dedicated cutoff or semi-cutoff luminaires to eliminate direct glare interference with drivers' vision
- Color Rendering Index (CRI): Ra ≥70 for general road sections; recommend Ra ≥80 for critical areas such as highway entrances/exits, toll stations, and emergency escape lanes to enable clear identification of traffic signs, pavement markings, and obstacles
To address the issues of uneven pavement reflection and blurred visibility caused by traditional backlit lighting, the new specialized standard explicitly recommends forward-lit illumination technology for expressways, better meeting dynamic visual requirements during high-speed travel:
- Standardize photometric parameters for forward-lit luminaires on expressways to eliminate brightness boundaries between lanes, further improving lighting uniformity and driving safety
1. Hardware Protection and Electrical Parameters
- Power factor: ≥0.95 to reduce reactive power loss in long-distance power supply lines along highways
- Wind resistance rating: Light poles and fixtures designed to withstand regional typhoon and strong wind conditions, typically meeting Class 12 wind resistance requirements
- Pole height: Main expressway lanes typically 12–15 m; interchanges and ramps can use 10–12 m; open elevated sections suitable for 15–18 m high-mast lighting
- Installation methods: Primarily single-side or double-side symmetrical layout; for extra-wide expressways, adopt staggered double-side arrangement to ensure full coverage without blind spots
V. Latest Requirements for Intelligent Control
- Support time-based dimming and intelligent motion-sensing dimming; automatically reduce power during off-peak nighttime hours to balance safety and energy efficiency
- Luminaires with dimming functions must strictly comply with mandatory standby power limits of ≤2.5 W to prevent unnecessary energy waste
Compared to the 2019 edition, the core upgrades in the 2025 national standard include:
1. Significantly raising energy efficiency thresholds across all color temperature ranges, phasing out low-efficiency outdated products;
2. Introducing mandatory standby power limits and refining testing specifications for dimmable luminaires;
3. Clarifying precise color temperature deviation requirements and unifying lighting color standards;
4. Adding dedicated forward-lit illumination specifications to specifically address visual challenges in high-speed driving;
5. Enhancing intelligent luminaire testing standards to meet evolving demands for smart lighting systems.
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