Why roads? Panels are more efficient at an angle. Also what on earth would you have to make them out to sustain the wear and tear of car tires. Just imagine a s

Why roads? Panels are more efficient at an angle. Also what on earth would you have to make them out to sustain the wear and tear of car tires. Just imagine a small rock stuck in a tire's tread... It also has to remain clear to have any chance of remaining some what efficient.