That's true. However, keep in mind that a solar roadway tile has to be "hardened" and its surface has to provide traction when wet. Both of those reduce the a

That's true. However, keep in mind that a solar roadway tile has to be "hardened" and its surface has to provide traction when wet. Both of those reduce the amount of light which actually reaches the photovoltaic cell. In other words, a clean tile is probably about as efficient as a dusty solar panel.