When most road engineering purchasers select solar road studs, they usually prioritize factors such as LED brightness, battery life, and purchase price. These parameters do affect the basic usage experience of the product, but they are not the core selection criteria for heavy-duty roads.
In scenarios where heavy trucks frequently pass through, such as highway freight lanes, ports, mining areas, industrial parks, etc., Load Rating is the key indicator that determines the service life of solar road studs and the stability of road maintenance. If the bearing capacity level does not meet the standards, the heavy trucks will repeatedly exert pressure, impact, and shear force on the road, causing rapid cracking of the outer shell, damage to the internal circuit board and battery, and other faults. Such faults not only significantly shorten the service life of the solar road studs but also continuously increase the maintenance costs of the road, with an annual additional maintenance cost of several thousand dollars. At the same time, it poses a potential safety hazard to road traffic.
In this next blog, NOKIN systematically dissects the bearing capacity selection logic of solar road studs in heavy-duty scenarios, providing standardized and implementable reference materials for engineering procurement and on-site construction.
Load Rating refers to the core performance indicator of solar road studs under standard test conditions, which can withstand vehicle loads and repeated crushing without structural damage or functional failure for a long time.
From the perspective of the international standard EN 1463 testing concept, the core value of the load rating does not lie in “not being damaged by a single heavy pressure”, but in the stability and reliability after long-term cyclic use.
Most ordinary road studs can withstand single static heavy pressure, but cannot withstand the high-frequency dynamic crushing and fatigue wear of heavy trucks. This is the core reason for the frequent damage of heavy-load road studs and the high maintenance cost.
For heavy-load engineering scenarios, the load rating is a more core selection criterion than LED brightness and battery life.
In engineering procurement, static load and dynamic load parameters are easily confused. Most low-priced products only mark static bearing data, which cannot be adapted to real road conditions. The core differences between the two are as follows in the table:
| Item | Static Load | Dynamic Load |
| Testing Method | The road stud is subjected to a constant static pressure in a single load test. | Simulates real vehicle traffic through repeated wheel loading and cyclic impact testing. |
| Impact Consideration | No. Instantaneous impact, shear forces, and vibration are not considered. | Yes. Includes the combined effects of impact, shear forces, and vibration generated by moving vehicles. |
| Relevance to Real Road Conditions | Low. Reflects only theoretical static load capacity under laboratory conditions. | High. Closely replicates the actual loading conditions experienced during repeated heavy truck traffic. |
Therefore, heavy-load road engineering procurement cannot only refer to static bearing data. The dynamic load parameters are the effective basis for judging whether the product is compatible with the heavy truck scenario.
Many purchasers have a core cognitive misunderstanding: they simply rely on the total weight of the vehicle to select solar road studs. However, in actual road conditions, the force exerted by heavy trucks on the road studs is a complex combination, far beyond static gravity.
When heavy trucks pass through, four types of mechanical loads will simultaneously act on the embedded road studs equipment on the road surface. Long-term cumulative effects are likely to cause equipment damage. The specific types of force are as follows:
The single-axis load of heavy trucks is much higher than that of private cars and light trucks. The load is highly concentrated in a local area of the road surface. As a small embedded road facility, the solar road studs will bear extremely concentrated pressure, making them prone to compression deformation and base loosening.
During vehicle movement, tires and the road surface will generate instantaneous impact forces. The faster the vehicle speed and the lower the road smoothness, the stronger the impact force. This instantaneous dynamic impact force is far more destructive than static pressure and is one of the main causes of damage to the road studs structure.
Heavy trucks have a large body weight and high inertia. During deceleration, braking, and starting, tires and the road surface will generate extremely strong horizontal shear forces. Long-term repeated shear friction will cause wear of the road studs outer shell, failure of the sealing structure, and overall loosening and detachment of the equipment.
The average daily frequency of heavy truck passage on heavy-duty roads is extremely high. Each road stud needs to withstand tens of thousands of repeated compressions every day. Long-term cyclic loads will trigger material fatigue aging, causing irreversible damage such as hidden cracks, internal component detachment, and circuit aging, ultimately leading to the complete failure of the equipment.
Not all roads require high-load rating solar road studs. Ordinary urban roads and pedestrian roads can meet the requirements with conventional models. The following five types of road sections frequently experience heavy truck crushing, impact, and shear, and must prioritize the verification of Load Rating indicators:
The proportion of freight vehicles passing through is high, the traffic is dense, and the vehicle speed is fast. The dynamic impact load is continuous and stable, and the requirements for the compressive, impact, and fatigue resistance of the road studs are extremely strict.
Container trucks have a total weight that is extremely large, and the vehicles start, stop, and turn frequently. The combined static pressure and horizontal shear force are double, belonging to extreme heavy-duty conditions. The equipment wear rate is 3-5 times that of ordinary roads.
Self-unloading trucks on mining roads have a tonnage far exceeding that of ordinary heavy trucks, and the road surface is uneven and covered with gravel. The instantaneous impact load is extremely strong. At the same time, the on-site dust and water erosion are very severe, which impose dual high standards on the structural strength and protection ability of the road studs.
Every day, a large number of logistics trucks pass through, and the equipment is subjected to frequent crushing. Long-term cyclic loads will accelerate the aging of ordinary road studs and easily cause malfunction and damage, requiring high-load models to be compatible.
All passing vehicles need to slow down, brake, and idle. The high-intensity shear force and vertical pressure generated by the concentrated braking of heavy trucks are very likely to cause conventional road studs to loosen and break. This is a high-frequency area for road stud wear.
The tonnage marking standards of various manufacturers on the market are not unified. Simply comparing a single tonnage parameter is prone to selection errors. When selecting for the project, it is necessary to comprehensively judge based on road scenarios, the proportion of heavy truck passage, and axle load intensity. The standardized selection matrix is as follows:
| Application Scenario | Heavy Truck Traffic Proportion | Recommended Load Rating |
| Ordinary Parking Lots | Extremely low; mainly passenger cars and light vehicles | Light-Duty Load Rating |
| Urban Roads | Moderate; occasional truck traffic with no frequent heavy-duty vehicle passage | Medium-Duty Load Rating |
| Highway Freight Lanes | High; dense heavy truck traffic at relatively high speeds | Heavy-Duty Load Rating |
| Port & Mining Transportation Roads | Extremely high; continuous heavy truck operation under harsh working conditions | Super Heavy-Duty Load Rating |
The shell is the first line of defense for the road studs to resist external forces. Different materials have greatly different strengths, corrosion resistance, and impact resistance. The recommended engineering scenarios also vary, and there is no absolute superiority or inferiority. Only need to select according to needs:
| Material | Core Characteristics | Recommended Application Scenarios |
| PC (Polycarbonate) | Lightweight, basic impact resistance, good light transmission, moderate cost | Pedestrian walkways, light-duty parking lots, bicycle lanes, and community pathways |
| ABS | Lower cost, good moldability, moderate impact resistance, average weather and aging resistance | Low-speed community roads, pedestrian paths in parks, and other areas without heavy truck traffic |
| Aluminum Alloy | High structural strength, excellent compression and shear resistance, corrosion-resistant, resistant to deformation | Highways, urban arterial roads, freight corridors, and roads with regular heavy vehicle traffic |
| Stainless Steel | Exceptional compression, impact, wear, and corrosion resistance; designed for extreme-duty environments | Ports, mining sites, heavy-load logistics hubs, highway interchanges, and other extreme heavy-duty applications |
High-quality materials need to be combined with scientific structural design to fully exert the bearing performance. The four core structural designs directly determine the long-term heavy-load durability of the road studs：
The entire assembly has no joint gaps, and the shell has strong integrity. It can effectively withstand heavy pressure and impact, preventing the joint structure from cracking and leaking water over a long period of time. It is suitable for various heavy-duty roads.
Additional reinforcement ribs are added at the bottom and the shell to disperse vertical pressure and horizontal shear force, reducing local stress concentration and significantly reducing the probability of equipment deformation and damage.
The internal space is filled with waterproof and shockproof sealing glue to fix components such as batteries, circuit boards, and LED light beads, preventing internal components from falling off or being damaged due to rolling and vibration, and improving overall stability.
A buffer protection structure is added in the light bead area to avoid direct external force squeezing on the light-emitting elements, ensuring that the equipment can withstand pressure while maintaining stable and continuous lighting.
The installation method determines the adhesion and firmness of the road studs to the road surface, directly affecting the shear resistance and detachment resistance. Different installation methods are suitable for different traffic load levels, with significant differences:
Convenient construction and low cost, relying on glue to adhere to the road surface, with relatively weak shear resistance. It is only suitable for community roads and sidewalks without heavy trucks and low-speed light loads.
Equipped with metal anchor bolts fixed to the road base, firmly locking the equipment, capable of withstanding the braking shear force of heavy trucks and high-frequency rolling, suitable for highways, logistics parks, etc. with medium to heavy loads.
The equipment part is embedded in the road surface, integrating with the road surface, with extremely strong stability, optimal shock resistance and detachment performance, specifically suitable for ports, mining areas, etc. with extreme heavy loads.
Most heavy-duty road studs are damaged prematurely, and the operation and maintenance costs exceed the budget, not due to product quality issues, but due to selection errors in procurement. Procurement should avoid the following 5 frequent errors:
Overemphasizing low prices while ignoring the load rating, material, and process differences. Although low-cost products can save hundreds of dollars in single purchase costs, the annual average damage rate is high, and the long-term total cost of frequent replacement and maintenance is far higher than that of high-end products.
Brightness is only an auxiliary parameter. In heavy-load scenarios, even the highest brightness cannot make up for the insufficient load capacity. Prioritize ensuring load stability, and then match the appropriate brightness, which is the scientific selection logic.
Not differentiating between light-load and heavy-load scenarios, and uniformly purchasing the same type of road studs. Using ordinary light-load road studs on ports, mining areas, etc., will inevitably lead to rapid failure and loss.
Misusing gluing installation for heavy-load scenarios, using ordinary anchor-free products, unable to withstand the shear force and impact force of heavy trucks, prone to equipment loosening, detachment, and displacement faults.
Believing in the oral parameters of the manufacturer and not requesting third-party testing reports. The procurement should require the supplier to provide EN 1463 standard test reports and mechanical and protection level certifications to ensure the parameters are true and compliant.
To avoid selection errors and standardize the procurement process, a checklist for heavy-duty solar road stud procurement has been compiled. By checking each item, it is possible to ensure the selection is compliant and compatible:
The product is clearly adapted to heavy truck traffic road scenarios
It has a third-party authoritative institution EN 1463 standard test report
The shell material matches the heavy-load level of the road (aluminum alloy/stainless steel preferred)
Adopt an integrated die-casting, reinforcing ribs, fully sealed durable design
The protection level reaches IP67/IP68, suitable for on-site environments
The LED visibility distance and light mode meet road safety standards
Lithium batteries, single-crystal solar panels parameters meet standards, with stable power supply
The installation method matches heavy-load conditions (anchor bolts/pre-buried preferred)
The manufacturer provides a complete after-sales warranty policy
The core difference lies in their bearing capacity and structural durability. Heavy-duty road studs use high-strength materials, reinforced structures, and professional heavy-duty installation methods. They pass the EN 1463 dynamic load test and can withstand heavy truck impacts, crushing, and shearing over a long period. Ordinary road studs are only suitable for light vehicle scenarios and can only meet the basic lighting power supply requirements, unable to withstand heavy-load combined forces.
Heavy truck traffic generates high axle loads, dynamic impact forces, and horizontal shear forces, with extremely high frequency of rolling. The long-term cyclic fatigue wear will quickly damage the shells, sealing structures, and internal components of ordinary road studs, while the slight static pressure on ordinary urban roads results in extremely low wear.
Do not accept oral parameters or single static load data. It is necessary to require the manufacturer of solar road studs to provide an EN 1463 dynamic cyclic rolling test report to verify whether the test conditions match the actual heavy-load scenarios of the road. The third-party authoritative test data should be the sole basis for judgment.
For communities and light-load parking lots without heavy trucks, the anchor-free adhesive type can be selected to reduce construction costs; for highways, logistics parks, etc., the anchor-bolted style should be preferred; for ports and mining areas with extremely heavy loads, the pre-buried + anchor bolt dual-fixed structure must be used.
The priority should be on three core items: ultra-heavy-load dynamic Load Rating, IP68 high protection level, and stainless steel high-strength shell. At the same time, check the anti-corrosion, anti-wear performance, and rainy-day power supply capacity, and adapt to extreme heavy pressure, dust, and mud-water erosion conditions.
EN 1463 is a global standard for road studs, which standardizes the core testing methods and qualified thresholds for mechanical bearing, optical performance, protection level, and durability of road studs. It can unify the evaluation standards of each manufacturer’s products and avoid false parameter marking. It is the core compliance basis for heavy-load engineering selection.
When selecting solar road studs for heavy-duty trucks, it is not sufficient to rely solely on brightness, battery life, purchase price, or single-tonnage parameters. The core lies in comprehensively evaluating the load-bearing grade based on the type of road, the composition of heavy truck traffic, and the on-site working environment.
The long-term reliability of the product is determined by four dimensions: material selection, structural design, installation method, and standardized testing. Ignoring any one of these dimensions will lead to premature failure of the equipment and increase the annual operation and maintenance cost by several thousand dollars.
When purchasing solar road studs for engineering projects, it is advisable to choose products that comply with the EN 1463 international standard and have been verified through real-world heavy-load conditions. This can effectively reduce the maintenance cost throughout the entire life cycle and stably enhance the safety of heavy-load roads and the stability of road markings.
