Bridges and elevated highways are core components of modern urban and intercity transportation systems, effectively alleviating traffic congestion and shortening travel times. However, these elevated sections have unique safety hazards at night and in adverse weather conditions, and ordinary road marking facilities cannot meet their high-standard safety guidance requirements.
According to the research data on active road studs and road safety from MDPI, when visibility on elevated highways decreases, the risk of vehicles deviating from the lane increases significantly. Therefore, reliable nighttime road guidance equipment is the key to eliminating road safety hazards and reducing traffic accidents.
Unlike ordinary ground roads, bridges and elevated roads are suspended and lack reference objects such as buildings and ground roads, resulting in many driving risks.
Firstly, drivers have no effective lateral reference objects during driving, making it difficult to accurately judge the road width and lane boundaries at night, easily causing lane deviation.
Secondly, high-traffic sections are prone to fog and crosswinds, and the problem of water accumulation on the road is prominent. The open and high-altitude environment will accelerate fog formation, prolong fog duration, and there is no natural drainage channel on the bridge deck, causing rainwater to easily accumulate.
Furthermore, the difficulty of identifying the edge of bridges and elevated roads at night increases significantly. Dim light will blur the boundaries between the road and the suspended area of the bridge, causing visual misjudgment by drivers.
Finally, the speed of high-traffic elevated roads can reach 80-100 kilometers per hour, and the driver's emergency reaction time is significantly compressed. A brief visual judgment error may cause lane deviation, vehicle scraping, or even major traffic accidents.
Traditional reflective road studs (cat's eye road studs) are widely used on ordinary roads, but they have obvious functional deficiencies in bridge and elevated road scenarios, unable to provide stable and effective nighttime guidance, and instead may pose potential safety hazards.
Traditional reflective road studs are passive reflective devices, and their working principle relies entirely on the close-range illumination of vehicle headlights to reveal the outline.
In rainy weather, rainwater forms a water film on the reflective surface, significantly weakening the reflective performance, resulting in blurred road contours.
In foggy weather, fog droplets scatter light, significantly reducing the visibility distance of reflective road studs, and drivers cannot predict road changes in advance.
Due to the lack of active lighting capability, traditional road studs can only provide weak visual cues and are not suitable for the complex conditions of high-traffic bridges and elevated roads with low visibility.
Bridges and elevated roads are exposed to special mechanical vibrations and temperature differences for a long time, accelerating the aging and damage of traditional reflective road studs. According to NAVIX technical data, structural failure is the core reason for the damage of traditional road studs in bridge scenarios.
Continuous vehicle passage causes high-frequency micro-vibrations on the bridge deck, combined with the seasonal thermal expansion and contraction of temperature differences, the studs are constantly subjected to alternating stress.
Long-term mechanical impact and temperature changes will cause ordinary road studs to come off, loosen, have surface cracks, or even fall off. Once the studs fail, the nighttime road guidance function of the bridge is completely lost, bringing great safety hazards to high-speed traffic.
Solar-powered road studs are upgraded active lighting safety facilities that perfectly solve the usage pain points of traditional road studs in bridge and elevated road scenarios. With advantages such as active lighting, strong environmental adaptability, and no wiring construction, they become the preferred safety upgrade solution for high-risk elevated sections.
Different from passive reflective road studs, solar-powered road studs are equipped with high-brightness LED bulbs, which can achieve constant or flashing active lighting. Based on actual project case data, the effective visible distance of solar road studs can reach 500-1000 meters, forming a continuous and clear road outline in the driver's field of vision.
Compared to traditional reflective road studs, solar road studs enable drivers to identify lane changes, bends, and bridge edges several seconds in advance, providing sufficient emergency reaction time for high-speed driving and effectively avoiding lane departure accidents.
Bends and ramps are often designed with S curves, overpasses, and interchanges. These complex sections are high-risk areas for traffic accidents.
Traditional reflective road studs cannot form continuous visual guidance on bends and ramps, easily causing drivers to have visual blind spots and misjudging the turning radius.
According to MDPI research verification, solar road studs laid along the road edge and lane lines can form a complete and continuous light band, with the light direction fully synchronized with the road trend, accurately guiding vehicles to safely pass through bends and merging ramps, and correcting driving deviations in real time.
The traditional wired LED road guidance system has extremely high construction and maintenance costs on bridges. Bridge surface wiring requires slotting and laying wires, with a complex construction process and significant impact on traffic flow.
At the same time, bridge lines are prone to aging and damage due to long-term rain and fog erosion, making fault detection and line maintenance difficult and costly.
Solar road studs adopt an independent solar power supply design, with each device operating independently, without any external wiring. The construction and installation are simple and efficient, with minimal impact on traffic, and completely eliminates electricity costs and line maintenance costs, conforming to green transportation construction standards.
This project is a high-speed elevated bridge in the city. The designed speed is 80–100 kilometers per hour. The bridge includes multiple continuous bends and interchanges.
The local climate is always humid and foggy. The original traditional reflective studs on the bridge surface had an extremely poor night-time guiding effect. During rainy and foggy weather, lane deviations, rear-end collisions, and other traffic accidents frequently occurred.
The core renovation goal of the project owner: to significantly improve the night-time visibility of the road, reduce the accident rate in adverse weather conditions, and cut the long-term operation and maintenance costs of road safety facilities.
Before the renovation, this elevated bridge mainly had three major safety hazards.
First, lane deviation accidents occurred frequently. Drivers could not accurately identify the lane boundaries when driving at high speed at night.
Second, the visibility at the bridge edge was poor. The suspended area of the bridge surface often caused visual oppression for drivers, and frequent situations of misjudging the road boundaries occurred.
Third, the interference from rain-induced reflection was severe. In rainy weather, the reflective studs would produce chaotic reflections, making the road outline blurry and seriously affecting the driving vision.
Considering the strict environment of the bridge, which has high load-bearing capacity, high humidity, and all-weather outdoor operations, this project selects industrial-grade high-standard solar reflective studs. The specific parameters are as follows:
|
Parameter |
Specification |
|
Material |
Aluminum Alloy |
|
Waterproof Grade |
IP68 |
|
Load-Bearing Capacity |
Greater than 30 Tons |
|
LED Light Color |
White / Yellow |
|
Battery Type |
Rechargeable Nickel-Metal Hydride (NiMH) Battery / Lithium Battery |
|
Continuous Working Time |
More than 100 Hours |
This project adopts a differentiated layout scheme based on the road location and road conditions to ensure the best visual guidance effect.
Straight road sections of the bridge: Yellow solar reflective studs are installed at the center line of the lane to separate opposing traffic flows; White solar reflective studs are installed at the edge line of the road to mark the bridge boundary. The standard installation spacing is 5–10 meters.
Bend and interchange convergence areas: The installation spacing is shortened to 3–5 meters. Through dense light bands, the road direction guidance is strengthened to remind drivers to slow down and avoid deviation during turning.
After the installation of the solar reflective studs, the night-time safe passage level of the elevated bridge has been significantly improved. It completely solves the usage pain points of traditional marking facilities in adverse weather and high-speed driving scenarios, achieving significant safety benefits and economic benefits.
The active-lit solar reflective studs form a stable and continuous light outline on the bridge surface.
Drivers can clearly identify the lane boundaries, bridge edge range, and interchange convergence area from a long distance, completely solving the problem of blurred vision during elevated night driving, and significantly improving the accuracy of route judgment.
In rainy, foggy, and low-light environments, traditional reflective facilities are prone to failure, causing great psychological pressure and driving risks for drivers.
The solar reflective studs are not affected by adverse weather conditions and can continuously and stably emit light, providing clear and reliable visual guidance, effectively relieving driver visual fatigue and driving pressure, and significantly reducing the accident rate in special weather conditions.
Compared with traditional street lamps and wired LED guidance systems, the operation and maintenance costs of solar reflective studs are extremely low.
The equipment is fully powered by solar energy, with no daily electricity expenses. The industrial-grade material, combined with waterproof and earthquake-resistant design, has a long service life and a long maintenance cycle, and the annual operation and maintenance costs are reduced by 60%–70% compared to traditional solutions.
The bridge and elevated road environment are strict and have high safety standards. In the design and equipment selection stage of the solar reflective studs project, four core indicators need to be focused on to ensure the long-term stable operation of the equipment.
The elevated bridge is subjected to heavy traffic vehicle crushing and heavy vehicle loads for a long time, requiring extremely high equipment load-bearing capacity. It is recommended to choose solar studs with a static load capacity of ≥ 30 tons. The high-strength aluminum alloy shell can effectively resist vehicle crushing and mechanical impact, preventing equipment deformation and light failure.
Bridge surfaces tend to accumulate water and are prone to fog erosion due to high humidity. The equipment's waterproof performance is crucial for stable operation.
Bridge-specific solar studs must have a minimum waterproof level of IP68 to completely prevent rainwater and fog from penetrating the equipment interior, eliminating issues such as circuit short circuits and battery damage, and being suitable for long-term humid outdoor environments.
Continuous micro vibrations caused by vehicle passage are one of the main reasons for bridge studs to detach and fail.
Special attention should be paid to the bonding strength of the dedicated structural adhesive. Opt for equipment styles with screws fixed and built-in shock absorption components, which can withstand high-frequency vibration impacts and ensure that the studs remain firmly attached for a long time and do not detach easily.
The bridge environment has large temperature differences between day and night, high temperatures in summer, and low temperatures in winter, along with frequent rainy and foggy days. These conditions impose strict requirements on battery endurance and stability.
High-quality lithium batteries/nickel-hydrogen batteries that are resistant to high and low temperatures and suitable for cloudy and rainy weather should be selected. They can maintain stable charging and discharging efficiency in extreme temperatures and long periods without sunlight, and can last for more than 100 hours after being fully charged.
Solar studs have strong environmental adaptability and flexible installation. Besides bridges and elevated roads, they can be widely used in various high-risk road scenarios, covering most traffic sections with low visibility and high safety requirements.
Fill the tunnel lighting blind spots, clearly mark the tunnel boundaries, and solve the visual adaptation problem for vehicles entering and exiting the tunnel.
Guide vehicles smoothly through complex overpasses and branch intersections, avoiding confusion and getting lost on the route.
Adapt to foggy and humid environments in mountainous areas, providing stable night-time guidance for narrow and winding mountain roads.
Prompt drivers to slow down and change lanes in advance, effectively avoiding rear-end collisions at highway exits.
Adapt to the windy and humid working environment of ports, providing safe guidance for vehicles passing through port logistics channels.
The standard installation spacing for straight bridge sections is 5–10 meters； for high-risk sections such as bends, ramps, and overpasses, the spacing should be shortened to 3–5 meters. Dense light bands can enhance road direction guidance and prevent vehicles from deviating.
Absolutely. Traditional reflective studs are prone to failure in foggy conditions, while solar studs use an active LED lighting design, with strong light penetration, which can break through fog and maintain a visible distance of over 500 meters, providing stable safety guidance for foggy driving.
Industrial-grade bridge-specific solar studs have excellent endurance. Fully charged, they can operate for more than 100 hours. Under normal usage conditions, the overall lifespan of the equipment can reach 3–5 years. With the professional design of IP68 waterproof, 30-ton load-bearing capacity, and anti-seismic and anti-detachment features, it can withstand extreme weather and bridge vibration losses, reducing the cost of frequent replacements.
Due to their characteristics such as being suspended at high altitudes, having few reference points, and experiencing frequent adverse weather conditions, bridges and elevated roads inherently pose risks for night driving. Traditional reflective road signs, due to their passive reflection and susceptibility to aging and failure, cannot meet the safety requirements for high-speed traffic.
Solar road studs, leveraging their core advantages of long-distance active illumination, strong adaptability to adverse weather conditions, no need for wiring installation, and low operation and maintenance costs, have completely solved the core pain points of safety guidance for elevated roads, effectively enhancing night road visibility, reducing accident rates in adverse weather conditions, and reducing long-term operation energy consumption and costs of the roads.
If you are planning a safety upgrade project for bridges or elevated roads, solar road studs offer a reliable, energy-efficient, and cost-effective high-quality solution.
