Road and highway lighting is core infrastructure for ensuring traffic safety and improving efficiency. Differentiated lighting systems are developed for both traffic scenarios and traffic flow characteristics, while sharing a common focus on green and energy-saving technologies.
Urban arterial roads must meet the demands of mixed traffic and pedestrian traffic during peak hours. Average brightness is typically 1.5-3 cd/m2, with a uniformity of ≥0.4. Lighting is arranged symmetrically on one or both sides, with poles 8-12 meters high and spaced 30-50 meters apart. For branch roads and rural roads, economic efficiency is key, with brightness levels of 0.5-1.5 cd/m2. Single-sided lighting is often used, with poles 6-8 meters high. LEDs are the primary light source, coupled with an intelligent control system that enables light and time control, as well as power reduction for late-night energy conservation.
Expressway lighting utilizes LED streetlights, with poles 12-15 meters high and spaced 40-60 meters apart. Some complex sections, such as interchanges, can reach 15-25 meters apart.
The light source configuration focuses on high brightness, low glare, and long life. Currently, the mainstream lighting system uses high-power LEDs ranging from 150W to 400W, with a color rendering index (CRI) ≥70 and a color temperature of 3000K to 5000K. This ensures clear nighttime vision while minimizing glare. Most fixtures utilize a cutoff or semi-cutoff design, using optical lenses to control the light angle and reduce glare for oncoming vehicles.
In the future, with the development of smart transportation, these will be further integrated into vehicle-road cooperative systems, enhancing lighting quality through dynamic brightness adjustment and intelligent fault warnings.
