The prerequisite for solar road studs to function on roads is to ensure their availability. The better the durability of solar road studs, the longer their service life. The durability of road studs refers to the ability of solar road studs to resist physical wear and tear, chemical erosion, environmental aging and other factors during long-term use, and to continuously maintain structural integrity and core functions.
As a key sign for road passage at night, the durability of plastic solar road studs directly determines the road visibility at night and in bad weather, thereby affecting driving safety. At the same time, it is also closely related to long-term maintenance costs and is a core consideration indicator in the procurement and operation of transportation engineering.
From a safety perspective, if the photovoltaic panels of plastic solar road studs age and their light transmittance decreases, or the battery life of lithium batteries shortens, it will lead to insufficient or extinguished brightness of leds at night, causing road signs to fail. In low-visibility scenarios such as rain, fog, and at night, the risk of accidents can increase by more than 40%.
From the perspective of operating costs, the initial procurement cost of plastic solar road studs (typically $20 to $50 per piece) is higher than that of ordinary plastic road studs. If their durability is insufficient (such as needing to be replaced every 1 to 2 years), frequent manual replacement and traffic control costs will significantly increase the total cost of ownership. High-durability products (with a lifespan of 3 to 5 years) can keep the average annual cost within 10 to 15 US dollars, offering better long-term economic benefits.
For urban management, the replacement of road studs requires the temporary closure of lanes. Frequent construction can disrupt traffic flow, cause congestion, and increase administrative coordination costs at the same time. Especially on main roads and expressways, the impact of construction closures is more significant.
In addition, in the bidding and compliance acceptance of traffic engineering projects, the service life and reflectivity maintenance requirements of road studs are the core assessment indicators. Low-durability road studs that do not meet the standards can lead to acceptance failure, delay project delivery, and even pose the risk of rework.
The core material of plastic road studs directly determines the durability of their foundation. Among commonly used engineering plastics, PC (polycarbonate) material performs better in terms of impact resistance and UV resistance. It can withstand the instantaneous impact force of vehicle rolling and is not prone to aging or becoming brittle even when exposed to sunlight for a long time. It is suitable for medium and high-traffic sections.
ABS material has a lower cost and good processing performance, but its wear resistance and UV resistance are relatively weak. Long-term use is prone to surface cracking and fading. It is more suitable for low-flow branch roads or temporary construction scenarios. The physical indicators of the material, such as density and tensile strength, as well as its chemical properties of acid and alkali resistance and salt spray resistance, directly affect the overall service life of the road studs.
Photovoltaic panels are a source of energy, and their light transmittance (initial ≥90%) and weather resistance directly affect the power generation efficiency. High-quality products are covered with tempered glass and encapsulated with EVA film, which can resist the impact of road gravel and rain erosion. After 5 years of use, the light transmittance retention rate is ≥80%. Low-quality photovoltaic panels are mostly covered with ordinary resin. Within 1-2 years, they will turn yellow due to ultraviolet aging, with the light transmittance dropping below 60%, resulting in insufficient power generation and LED brightness attenuation.
The cycle life of lithium batteries is the key to the endurance of solar road studs. The cycle life of lithium iron phosphate batteries is ≥1000 times and they can be used for 3 to 5 years. The cycle life of lithium cobalt oxide batteries is only 300 to 500 times, and their endurance will be shortened within 1 to 2 years. In addition, low-temperature performance is also very important. High-quality lithium batteries have a capacity retention rate of ≥70% at -20 ℃, while inferior batteries may fail to discharge due to low temperatures
One of the main reasons for the aging of plastic solar road studs is the erosion of ultraviolet rays. As plastic solar road studs are used outdoors for a long time and need to be exposed to ultraviolet rays for a long time, it will cause the surface reflective film of the road studs to fade, peel off and become brittle, and eventually be completely damaged. Especially in tropical and subtropical regions, the strong ultraviolet environment will accelerate this process Shorten the lifespan of plastic solar road studs by 30% to 50%.
In addition, high-temperature environments can cause plastics to soften and deform, while low-temperature conditions may lead to brittle fracture. The alternating freeze-thaw cycles of rain and snow can undermine the bonding force between the road studs and the base layer. When water on the road surface seeps into the gaps and freezes, it expands, which can easily cause the road studs to loosen and fall off. Road salt used for deicing roads in winter is corrosive and can erode plastic materials and reflective components, accelerating aging.
Traffic flow and vehicle load are the key factors affecting the wear rate of plastic solar road studs. In high-frequency traffic scenarios such as expressways and main urban roads, the surface of road studs will wear out rapidly, the reflective film will gradually fall off, and the plastic base may also develop cracks or damage due to repeated impacts.
The crushing impact force of heavy-duty trucks and overweight vehicles is stronger, which will significantly accelerate the damage of plastic solar road studs. Especially on freight channels and roads around ports, the wear rate of plastic road studs is 2 to 3 times that of ordinary sections. Therefore, it is necessary to select road stud products that are suitable for load-bearing capacity based on the traffic flow level and vehicle type distribution of the road section.
The correct installation method and base treatment are the foundation for ensuring the durability of plastic solar road studs. The common installation methods of plastic road studs include adhesive type and embedded type. For the adhesive type installation, it is necessary to ensure that the surface of the asphalt or concrete base is clean, dry, free of oil stains and dust; otherwise, the bonding force will be insufficient and the road studs are prone to fall off under the pressure of vehicles.
For embedded installation, the embedding depth needs to be well controlled. If it is too shallow, it may be scratched and loosened by the vehicle; if it is too deep, it will affect the reflective Angle. The flatness of the base layer is also of vital importance. An uneven base layer can cause uneven force distribution on the road studs, leading to excessive local pressure and damage. In addition, the compatibility of the base material with the road studs also needs to be considered to avoid the interaction of chemical substances affecting the fixation effect.
The precision of the production process directly affects the structural stability of plastic solar road studs. High-quality road studs are made through an integrated molding process with no seams at the joints, effectively resisting water infiltration and external impact. Poor-quality road studs may have injection molding defects such as bubbles and cracks, and are prone to damage during use.
The quality of the light-emitting components is the core manifestation of durability: Solar road studs choose LED beads as the light-emitting components. Leds have the characteristics of high brightness, stable performance and long lifespan. Selecting high-quality LED beads can significantly enhance the durability of plastic solar road studs.
The maintenance of plastic solar road studs should take into account both physical structure and electrical performance: If the dust and oil stains on the surface of the photovoltaic panels are not cleaned for a long time, it will lead to a decrease in light transmittance. If the damaged plastic base is not replaced in time, rainwater will directly invade the internal electrical components. If the LED brightness and lithium battery voltage are not detected during the inspection, early faults may be missed. Scientific maintenance can extend the lifespan of plastic solar road studs by more than 30%.
|
Material |
Advantages & Disadvantages |
Typical Lifespan |
Applicable Scenarios |
|
Plastic (ABS/PC) |
Advantages: Low cost, lightweight, easy to install, high construction efficiency, impact-resistant, not easily broken. Disadvantages: Average wear resistance, short service life on heavy-load sections, limited UV resistance. |
Medium & low traffic: 3–5 years; High traffic: 1–2 years |
Urban side roads, community roads, temporary construction sections |
|
Tempered Glass |
Advantages: Excellent wear resistance, long reflective life, stable optical performance. Disadvantages: Poor impact resistance, fragile, requires careful installation; broken pieces may cause safety hazards. |
5–8 years |
Expressways, main roads, high-traffic sections |
|
Aluminum / Metal |
Advantages: High load-bearing capacity, solid structure, wear-resistant, strong weather resistance. Disadvantages: High cost, heavy weight, complex installation requiring professional construction. |
6–10 years |
Heavy-duty freight routes, port roads, high-grade highways |
|
Ceramic |
Advantages: Extremely wear-resistant, corrosion-resistant, long-lasting reflective performance. Disadvantages: Brittle, poor impact resistance, costly, difficult to install. |
7–12 years |
Airport runways, high-grade expressways, special environment road sections |
The lifespan of plastic solar road studs is significantly influenced by material, road conditions, and maintenance. The following are conservative industry estimates:
High-quality PC material + lithium iron phosphate battery + tempered glass photovoltaic panels: 3-5 years, among which the retention rate of photovoltaic panel light transmittance after 5 years is ≥80%, the cycle life of lithium battery is ≥1000 times, and the LED light attenuation rate is ≤30%.
Ordinary PC material + lithium cobalt oxide battery + resin photovoltaic panel: 2-3 years. After 3 years, the capacity of the lithium battery may drop to less than 50% of the initial level, and the brightness of the LED will decline significantly.
ABS material + low-quality lithium battery + ordinary photovoltaic panels: 1-2 years. After 1 year, the photovoltaic panels may turn yellow, the lithium battery's battery life may be insufficient, and even short circuit faults may occur.
Harsh environments (high temperature/high salt spray/heavy load) : The lifespan may be shortened to less than one year, and frequent replacement and maintenance are required.
The durability of plastic solar road studs needs to be verified through a series of professional tests. The following are the core test items and acceptance criteria:
|
Test Item |
Test Content Description |
Acceptance Criteria |
|
Compressive Load Test |
Simulates vehicle rolling pressure to evaluate structural strength and electrical system stability. |
Withstands ≥100 kN without deformation; electrical components operate normally. |
|
Wear Resistance Test |
Runner rubs the surface 5,000 times to assess wear resistance of the plastic shell and photovoltaic panel. |
Plastic surface wear ≤0.5 mm; photovoltaic panel light transmittance reduction ≤5%. |
|
UV Accelerated Aging Test |
Simulates 10 years of UV exposure to test material aging resistance. |
No cracking on plastic; photovoltaic panel light transmittance retention ≥80%. |
|
Photovoltaic Conversion Efficiency Test |
Measures initial photovoltaic efficiency under standard light (1000 W/m²). |
Initial efficiency ≥18%; ≥15% after 5 years of aging. |
|
Lithium Battery Capacity Retention Test |
Tests capacity retention after 1000 charge/discharge cycles and low-temperature discharge performance. |
Capacity retention ≥80%; discharge capacity at -20℃ ≥70%. |
|
LED Light Attenuation Test |
Measures light attenuation after 30,000 hours of continuous illumination. |
Light attenuation rate ≤30%; brightness ≥3500 mcd. |
|
Waterproof Test |
Simulates underwater immersion to verify sealing performance and circuit safety. |
Waterproof grade IP68; submerged 1 meter for 24 hours with no water ingress or short circuit; LED operates normally. |
|
Maintenance Item |
Main Urban Roads (High Traffic) |
Branch Urban Roads (Medium & Low Traffic) |
|
Photovoltaic Panel Cleaning |
Clean once a month. Use a high-pressure water gun to rinse off dust; remove stubborn oil stains with a neutral cleaner to avoid scratching the panel. |
Clean once every 2–3 months. Same cleaning method as high-traffic roads. |
|
Performance Testing |
Conduct every 3 months. Use a multimeter to measure lithium battery voltage (normal 3.2–3.6V) and test LED brightness at night (≥4000 mcd). |
Conduct every 6 months. Same testing method. |
|
Structural Inspection |
Inspect every 3 months. Check for damaged/loose plastic bases and cracks in photovoltaic panels. Handle any issues immediately. |
Inspect every 6 months. Same inspection requirements. |
|
Circuit Inspection |
Conduct every 6 months. Check wiring interfaces for corrosion or looseness to avoid contact failures. |
Conduct once every 12 months. Same inspection requirements. |
In addition to regular cleaning, anti-scratch and wear-resistant films can be pasted on the surface of the photovoltaic panels (at a cost of about 1 US dollar each) to reduce damage from the impact of crushed stones and extend the stable period of light transmittance.
Avoid keeping the road studs in a completely discharged state for a long time (such as for more than 10 consecutive days of rain). Manual recharging can be done regularly (every 3 months) to extend the cycle life.
Once damage to the plastic base is detected, it should be replaced within 24 hours to prevent rainwater from seeping in and damaging electrical components, thereby reducing chain failures.
In low-temperature areas (below -10℃), check the low-temperature performance of lithium batteries before winter. Replace them with low-temperature-specific batteries if necessary to avoid failure to discharge in low temperatures.
Depending on the battery type, lithium iron phosphate batteries can be used for 3 to 5 years (with a cycle life of over 1,000 times), while lithium cobalt oxide batteries only last for 1 to 2 years. It is recommended to give priority to the lithium iron phosphate model and pay attention to regular maintenance to avoid deep discharge.
The lifespan of a regular PC material model on high-speed sections is approximately 1.5 to 2 years. If a model with enhanced compressive strength (≥150kN) and photovoltaic panel impact resistance is chosen, the lifespan can be extended to 2 to 3 years. However, it is still necessary to conduct inspections every 3 months to promptly address wear issues.
Replacement is required in the following situations: LED night brightness less than 3000mcd (visible distance less than 100 meters), lithium battery voltage less than 3.0V (battery life less than 5 hours), photovoltaic panel light transmittance less than 70% (sudden drop in power generation efficiency), and plastic substrate damage that cannot be repaired.
In the short term, the plastic model has a lower cost (30 to 50 US dollars), and in the long term, the glass model has a longer lifespan (5 to 8 years). If the traffic on the road section is high and the maintenance cost is high, the glass model is more cost-effective. If the traffic on the road section is low and the budget is limited, the plastic version offers better value for money.
Products with an IP68 waterproof rating should be selected, with a focus on checking the integrity of the circuit interface sealant and lithium battery packaging. When installing, ensure that there is no water accumulation at the base. Waterproof gaskets can be added to the bottom of the road studs to prevent rainwater from seeping into the circuit and causing short circuits.
The durability of plastic solar road studs is a dual test of "physical structure + electrical performance". During the procurement and operation process, it is necessary to abandon the short-sighted thinking of "only looking at the initial cost", scientifically select materials based on the traffic flow and load conditions of the road section, and combine standardized installation and regular maintenance to maximize the use value of plastic solar road studs and reduce the long-term total cost of ownership.
