Solar road studs are ideal for Saudi desert highways because they provide active LED illumination, withstand temperatures above 70°C, resist sand abrasion, and reduce maintenance costs by up to 75%.
According to the Saudi Vision 2030 and Saudi Building Code land planning data, over 70% of the territory of Saudi Arabia is desert and arid land. The intercity main highways within the country have a wide range of mileage, such as the Riyadh-Dammam highway, with a single journey distance exceeding 400 kilometers, passing through uninhabited desert areas.
With the development of commercial and logistics industries, the demand for night freight transportation and cross-border long-distance private car passage on Saudi desert highways has continued to increase. Long-distance closed driving, lack of reference road conditions in the desert, significantly increase driver visual fatigue and the probability of driving deviation.
According to the World Bank Global Road Safety Facility research data, the eastern and central desert areas of Saudi Arabia have an average of over 90 days of sandstorms per year.
Regular floating dust and strong sandstorms will completely cover the hot-melt and cold-applied conventional road markings, and the visibility of the road markings will be directly reduced to zero. The night visibility on the non-lit desert sections is lower than 30 meters, and the lane boundaries, ramp dividers, and edge of curves cannot be identified. The traffic management statistics in the region show that accidents on the desert roads account for 62% of the total accidents.
According to the environmental monitoring data of the Middle East Solar Industry Association (MESIA), the surface temperature of the road in the inland desert of Saudi Arabia can reach up to 65°C at midday in summer, and the internal temperature of the sealed stud cavity can exceed 70°C.
Commonly used ABS and ordinary modified plastic road studs, when exposed to high temperatures for a long time, are prone to shell cracking, base deformation, and glue detachment problems. Conventional civilian plastic studs have an average service life of less than 6 months under Saudi desert conditions, and the replacement frequency is extremely high.
Based on the outdoor facility durability test report of MESIA, the sand and dust in the Saudi desert have three characteristics: high frequency, high hardness, and continuousness.
The flowing sand grains rub against the transparent lens of the stud, wearing off the reflective surface and reducing the light transmittance; the dust will stack and cover the reflective and luminous working surfaces. Uncoated road marking accessories without anti-sand coating will lose up to 45% of their light emission and reflective performance within 30 days of use, and the road guidance function will be significantly impaired.
Most of the desert highways in Saudi Arabia are far from urban maintenance stations, with a scattered road network distribution. The difficulty of manual fixed-point inspection is extremely high, and the cost of a single desert inspection, including labor, vehicle, and material expenses, can reach $280 per kilometer.
The combined cost of batch removal of damaged studs, procurement for replenishment, and construction stoppage for paving is high. The annual replacement cost of traditional studs is approximately $1,260 per kilometer. At the same time, road closure construction will block intercity freight transportation, causing logistics capacity loss, and further adding indirect economic losses to the maintenance cost.
According to the professional definition of the road safety laboratory, traditional glass beads and prism-type reflective road studs belong to passive reflective facilities.
This type of product has no built-in power supply and light-emitting module, and only relies on the reflection of the vehicle's main light source to form an image, without the ability to provide autonomous road warning lighting. Without vehicle headlights illumination, reverse light at intersections, or night without light, traditional reflective road studs cannot play the role of lane guidance at all.
Combined with outdoor working condition tests and Middle East road engineering field tests, sand and fine sand are easily adhered to the inner groove of the reflective prism, and water washing cannot completely remove them. Light dust can reduce the reflective brightness by 60%, while severe sand dust coverage causes the reflective function to fail completely.
During long-distance driving, drivers cannot detect the reflective points on the road surface, and the identification of lane boundaries is completely lost.
The compliance standard traditional reflective road studs have an effective warning distance of only 35-50 meters when the vehicle lights are directly shone on them in clean conditions.
The legal speed limit on Saudi desert highways is generally above 120 km/h. The faster the vehicle speed, the shorter the driver's reaction time for avoiding risks.
The limited warning distance cannot meet the needs of safe driving on highways. The risk of veering off the lane, deviating from the lane, and failing to avoid resulting in a rear-end collision significantly increases.
Global road photoelectric laboratory test data shows that the compliant solar LED studs are in the active illumination mode and do not rely on the vehicle's main light source.
The constant high-brightness LED light source can outline the lane lines, center lines, and dangerous sections all day long. In clean conditions, the effective visibility distance can reach 300 meters, and in sand dust low-visibility scenarios, the visibility distance can still maintain above 120 meters, comprehensively enhancing the long-distance lane guidance capability.
The annual irradiation monitoring data of MESIA proves that the average annual sunshine duration in the Saudi desert area is over 3,200 hours, with a daily solar irradiation of 5.7-7.0 kWh/m².
The efficient monocrystalline silicon solar panels charge and store energy during the day and are suitable for short-term cloudy and light sand dust weather for replenishment. A fully charged battery can support the studs to continuously emit light at night for 72 hours, coping with continuous sand dust cloudy days without sunlight conditions, with extremely strong power supply stability.
The dedicated desert model solar road studs are of all-category off-grid independent operation, without the need to lay municipal power supply cables or build power distribution control cabinets.
The entire construction process of road network infrastructure wiring can be saved by omitting road base cutting, cable pre-burial, and transformer commissioning. The construction cost per kilometer of road network can be saved by 3,200 US dollars. The desert solar road studs are very suitable for long-distance road networks in Saudi remote and unmanned deserts, not limited by the coverage area of municipal power grids, and have extremely strong landing adaptability.
|
Comparison Item |
Traditional Reflective Road Studs |
Desert-Specific Solar Road Studs |
|
Night Visibility |
Lower, dependent on vehicle light reflection |
High, with LED self-illumination |
|
Power Supply Method |
No power supply, passive reflection |
Active solar energy storage power supply |
|
Annual Maintenance Cost per Kilometer |
USD 1,260 |
USD 310 |
|
Work Stability in Sand Dust Weather |
Highly prone to failure |
Operates normally |
|
Desert Service Life |
4–6 months |
3–5 years |
This implementation case is a main desert trunk highway in the central and northern part of Saudi Arabia, connecting urban and suburban logistics parks with the central freight hub.
The total length of the section is 18.6 km, with four lanes in both directions. The entire section passes through desert areas without human habitation, and there is no municipal lighting system for illumination. The daily average traffic volume is 1,120 vehicles, with heavy-duty freight vehicles accounting for 58%. The traffic flow during the period from 22:00 to 6:00 the next day accounts for 42%.
There is no lighting support at night, and the hot-melt lane markings are difficult to be identified by the naked eye, and the lane division boundaries are unclear.
Heavy-load vehicles are prone to veering off the lane, crossing the lane, and unintentionally deviating from the road surface. Roadside departure accidents occur frequently. There are 3 consecutive bends and 2 interchanges as accident high-risk points. Before the renovation, the monthly average number of traffic accidents was 8, and the road safety rating was not up to standard.
The project uses cast and thickened aluminum shell studs throughout, different from ordinary plastic products. The shell is resistant to high-temperature thermal deformation and can withstand 70°C cavity temperature for a long time, suitable for the extreme surface temperature of the desert at noon. The overall anti-pressure rating reaches 40 tons, capable of withstanding the crushing of heavy Saudi oil tankers and freight trailers for a long time. It is resistant to impact and deformation, extending the service life of the product.
The entire machine of the desert solar road studs is sealed to the top IP68 protection level. The fully enclosed integrated silicone filling process can prevent fine sand and floating dust from entering the circuit cavity through the joint gaps, eliminating the wear of the circuit board by sand and blocking the transparent lenses. At the same time, it is suitable for the day-night temperature differences in the desert and short-term heavy rain weather. The internal circuits are completely free from moisture and faults, ensuring stable operation throughout the day.
The desert solar road studs are equipped with imported high-brightness anti-glare LED bulbs, achieving synchronous lighting for both directions of the road. Both drivers traveling in both directions can detect the illuminated points on the road from a long distance, suitable for the reverse light scenarios during high-speed overtaking.
The LED bulbs are equipped with anti-sand and wear-resistant coatings, reducing the wear caused by sand and wind, and ensuring the long-term brightness of the lighting, improving the overall long-distance lane recognition effect.
Solar road studs are evenly installed along the centerline of the two-way lanes on the expressway, with a spacing of 8 meters per unit.
Visual division of opposing traffic flow and the same-direction traffic flow boundaries, preventing night-time illegal overtaking and crossing the line overtaking behaviors, and standardizing the driving trajectory.
Solar road studs are installed along the left and right road sides of the expressway, with a spacing of 6 meters per unit, forming a closed contour to outline the overall road shape.
It provides a reference for the roadside, accurately predicting the road width, effectively preventing vehicles from leaving the paved road and falling into desert gullies.
Solar road studs are densely installed in continuous curves, ramp entrances, and dangerous points such as long downhill sections, with a spacing of 3 meters per unit.
Frequent flashing lights provide early warnings of road changes, reminding drivers to slow down in advance and correct their driving direction to avoid skidding in curves and rear-end collisions on ramps.
After the renovation, the overall lane visual distance in clear nights has increased to over 280 meters.
In moderate sand dust weather, the road lighting lane outline remains clear and complete, allowing drivers to predict the road conditions in advance.
It significantly alleviates visual anxiety during long-distance night driving, enhancing the safety and confidence of long-distance intercity highway travel.
The data from the 6-month project operation review shows that the probability of lane deviation and unconscious deviation of vehicles has decreased by 71%.
The number of accidents caused by failure to decelerate in time, rear-end collisions, and crossing-line overtaking has significantly decreased, with the monthly accident volume reduced from 8 incidents to within 1 incident.
The road safety rating has reached the standard, fully meeting the Saudi traffic management road safety operation standards.
The all-weather solar road studs of this project do not require frequent manual cleaning, have a self-cleaning slope design for wind and sand, and reduce the frequency of monthly inspections.
The annual maintenance and replacement cost per kilometer has been reduced to 310 US dollars, 75% lower than the traditional reflective road studs in terms of maintenance expenses.
No need for frequent high-frequency construction on closed roads, ensuring the all-day smoothness of the desert freight road network, and significantly improving the indirect logistics benefits.
Based on the smart city renovation plan of Riyadh, intelligent dimming solar road studs are batch installed on urban ring roads, suburban landscape roads, and slow-moving auxiliary roads. It takes into account traffic guidance and urban night lighting, adapting to the low-light and sand-dust environment of Saudi Arabia's 2030 smart infrastructure low-carbon renovation indicators.
Peripheral taxiway roads of Jeddah Islamic Airport, Riyadh King Khalid Airport, and freight connection roads, suitable for low-light and sand-dust areas. Solar road studs have no wiring construction and high guiding and identification accuracy, ensuring the safety of all-day connection driving on the airport.
Heavy-load traffic roads in the eastern coastal industrial park and desert logistics park, adapting to all-day truck traffic conditions. High-strength solar road studs are suitable for high-frequency and heavy-load rolling, reducing the maintenance costs of road signs in the park area.
The Rub' al Khali Desert Tourist Loop and the desert camping connection minor road have no power grid coverage and seasonal fluctuations in pedestrian and vehicle flows. Off-grid solar road studs can be implemented at a low cost, balancing the safety of sightseeing driving and the low-carbon infrastructure requirements of the scenic area.
The hard selection criteria for solar road studs purchased in the Saudi Desert: The product cavity temperature resistance ≥ 70℃. Preferentially use die-cast aluminum alloy and modified anti-UV engineering shells, and reject ordinary ABS plastic shells to avoid deformation and cracking under high temperatures.
For intercity expressways and main freight roads, the selection of solar road studs: Pressure resistance level ≥ 40 tons. For scenic auxiliary roads and municipal slow-moving roads, the selection: The minimum compatible pressure resistance level is 20 tons, matching the heavy-load traffic conditions of Saudi Arabia.
The lens of the solar road studs must be equipped with nano anti-sand coating to reduce light loss due to sand grinding; the shell is added with anti-ultraviolet coating. Resist strong desert solar UV aging, avoid shell discoloration and material powdering, and extend the outdoor service life.
Opt for high-temperature-resistant lithium iron phosphate energy storage batteries to avoid the problem of lithium batteries bulging and failure under high temperatures.
Hard parameters of solar road studs: Full charge supports continuous lighting duration ≥ 72 hours during rainy days with continuous darkness, cycle charging and discharging times ≥ 1200 times, compatible with extreme sand and dust cloudy storage conditions.
Answer: The customized Saudi model IP68 dust-proof solar road studs can operate normally. In severe dust-laden weather, the panel will retain a small amount of accumulated dust, but it can still absorb scattered solar energy for energy storage; combined with the slope self-cleaning structure, large sand and dust can be automatically removed from the floating dust. Different from passive reflective road studs, the active LED lighting is not affected by dust and still has the ability to guide the lane.
Answer: The standard desert-specific solar road studs can have a lifespan of 3-5 years under normal 70℃ high-temperature conditions. The core relies on three configurations: high-temperature-resistant batteries, fully sealed-gel sealed circuits, and anti-UV aluminum alloy shells. This is far superior to the half-year lifespan of ordinary plastic road studs.
Answer: For the Saudi desert conditions, the comprehensive performance of solar road studs is fully superior to traditional reflective road studs. It has four advantages: active lighting, strong adaptability to dust, longer warning distance, and lower annual operation and maintenance costs. It is suitable for long-distance unmanned desert road networks; traditional reflective road studs are only suitable for short-distance municipal roads with less dust and complete street lighting facilities in urban areas.
Saudi Arabia has unique conditions such as high temperatures, strong sandstorms, and long-distance unmanned desert road networks, which pose severe challenges to the use of pavement traffic marking facilities. Conventional hot-melt markings and passive reflective road studs cannot adapt to extreme conditions, and the road protection capabilities are significantly lacking.
Based on this local high-speed road implementation case, it can be confirmed that the customized desert solar road studs have four core advantages: autonomous LED active lighting, strong adaptability to sandstorms and high temperatures, long-distance driving warning, and low cost for full-cycle operation and maintenance.
With the comprehensive promotion of Saudi Vision 2030's smart transportation and low-carbon infrastructure plans, solar road studs that balance safety, energy conservation, and low-cost operation and maintenance have become the core infrastructure for the smart renovation of Saudi intercity highways, park roads, and scenic road networks. They are also the optimal procurement solution for improving road safety in the desert areas of the Middle East.
