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What Is a Solar Roadway?

A solar roadway is an innovative concept where roads are paved with solar panels, transforming them into power-generating pathways. This technology aims to reduce fossil fuel dependency, harness clean energy, and revolutionize infrastructure. Imagine driving on streets that power homes and cities! Intrigued by how these sun-soaked roads work and their potential impact? Join us as we illuminate the journey of solar roadways.
Alex Newth
Alex Newth

A solar roadway is a proposed road made from a series of glass panels intended to replace asphalt streets while reducing energy costs and assisting drivers. According to plans and prototypes still being developed in 2011, each solar road panel would absorb the sun's energy, with the energy generated from a nationwide grid of these panels expected to be three times that needed to power the United States. Inside the panels would be light-emitting diodes (LEDs) intended to create the yellow and white lines commonly present on asphalt streets and to spell out messages such as “School Zone” or “Slow Down”. The LEDs also are intended to be sensitive to the presence of animals and light up to show drivers where animals are in the road. A heating mechanism in the panel would keep streets from icing over during the winter.

The predominant trait and main reason for a solar roadway is to produce more clean energy; a secondary benefit would be to create a road that is able to pay for itself during operation. To do this, each panel would be equipped with a large solar panel that would capture the sun’s energy on a continual basis. It is projected that this would provide the United States with about three times the amount of energy required annually. Along with the solar panels, many other features would be added to help drivers.

Asphalt roads could one day be replaced by solar roadways, which would harvest the energy of sunlight.
Asphalt roads could one day be replaced by solar roadways, which would harvest the energy of sunlight.

LEDs in the glass panel are intended to shine in both white and yellow to create the lines and messages commonly seen on traditional asphalt streets. This would allow messages to be changed on-the-fly and eliminate the need for painting and repainting the street. The solar roadway also would generate light, making it easier for drivers to see the road at night.

The LEDs in the solar roadway panels are intended to be able to create common street messages and lines, but they also are expected to protect wildlife. Plans for the panels call for them to be sensitive to an animal’s touch. When a deer, possum or other animal touches the glass, the LEDs would turn on, alerting drivers to the animal’s presence.

Heating mechanisms in the panels also would help during winter. Ice and snow can freeze on streets, making it dangerous to drive. The heating mechanism would ensure that snow and ice melts without the need for removal. This would ensure that the roads are safe during the winter and keep states and individuals from having to pay to remove the snow and ice.

As of July 2011, Solar Roadways Inc. of Idaho had been awarded a grant from the U.S. Department of Transportation's Federal Highway Administration to continue its development of the panel. An initial grant allowed for the development of a prototype panel. Plans for the second phase included the creation of a parking lot built using the solar panels.

Frequently Asked Questions

What is a solar roadway?

A solar roadway is an innovative concept where roads are paved with solar panels instead of traditional materials like asphalt. These panels generate electricity from sunlight, which can be used to power streetlights, traffic systems, and even nearby homes and businesses. The idea is to turn otherwise passive infrastructure into an active part of the energy grid.

How much power can a solar roadway generate?

The power generation capacity of a solar roadway depends on various factors, including the efficiency of the solar panels, the size of the road, and the amount of sunlight the area receives. According to Solar Roadways, their prototype parking lot can generate about 3,600 kWh per day, enough to power a small household for a year (

Are solar roadways currently in use?

As of now, solar roadways are in the experimental phase and are not widely used. Several pilot projects have been conducted around the world, such as in France, the Netherlands, and China. These projects are testing the feasibility, durability, and economic viability of integrating solar technology into road surfaces.

What are the benefits of solar roadways?

Solar roadways offer multiple benefits, including generating renewable energy, reducing the need for land-based solar farms, potentially melting snow and ice to improve road safety, and providing a platform for smart transportation systems. They also promise to reduce the carbon footprint associated with traditional road construction and maintenance.

What are the challenges facing solar roadways?

One of the main challenges is cost, as solar roadways are currently more expensive to install than traditional roads. Durability is another concern, as the panels must withstand heavy traffic and harsh weather conditions. Additionally, the energy efficiency of solar roadways is generally lower compared to conventional solar farms due to the flat positioning and potential shading from vehicles.

Is it feasible to replace all roads with solar roadways?

While the concept is promising, replacing all roads with solar roadways is not currently feasible. The technology needs further development to improve cost-effectiveness and durability. Moreover, not all roads are suitable for solar panel installation due to shading from buildings and trees or insufficient sunlight exposure. It's a long-term vision that requires significant advancements and investment.

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Discussion Comments


@Inaventu- I'm no scientist myself, but I think the latest solar technology does not require nearly as much sunlight as previous attempts. The trick is to generate and store as much power as possible whenever the sun is shining on the panels. The batteries would discharge that stored energy at night or on cloudy days.

The problem we have now is that solar panels don't generate a lot of power individually, and our present battery technology is not advanced enough for large scale solar energy projects. The best batteries in a laptop computer or smart phone still don't hold a usable charge for more than a few hours. Imagine how much energy a future solar-charged battery would have to store in order to power an average home.


I think we're actually going to see at least solar parking lots in our lifetimes, and solar roadways will be just a generation away. I agree with mrwormy that the technology isn't quite here yet, but I think we're doing much better than when the first solar panels came out. If we can scale down the panels and still produce the same amount of power, this idea of solar roads might just work.

For me, the problem would be deciding which parts of the country would benefit most from this solar energy system. I can easily see the wide open highways in the sunny parts of the West being the first places to get solar roadways, but would enough people benefit from the generated electricity? If they were installed on the busier traffic corridors on the East coast, would they receive enough sunlight to operate efficiently?


I'm always excited to hear about solar power breakthroughs and practical uses for solar energy. But I think the biggest hurdle in this day and time will always be financial. We still don't have affordable solar panels that can generate enough electricity to be considered efficient. We're still having to put racks and racks of solar panels on experimental cars just to power their motors and charge their batteries.

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    • Asphalt roads could one day be replaced by solar roadways, which would harvest the energy of sunlight.
      By: Nicola_Del_Mutolo
      Asphalt roads could one day be replaced by solar roadways, which would harvest the energy of sunlight.