So let's take the conservative end of this - 1,000 lane-kilometers. Assume a lane is about 4 meters. Thus we have 4 square kilometers as a target, if we assum

So let's take the conservative end of this - 1,000 lane-kilometers. Assume a lane is about 4 meters. Thus we have 4 square kilometers as a target, if we assume a square meter of road is exactly as good as a square meter of dirt. http://www.france-agri-invest.com/property_for_sale/91.html http://www.france-agri-invest.com/property_for_sale/91.html A Stunning Estate of 404 hectares near Toulouse Price: € 4,130,000 € including all fees About 1€ per square meter. For farmland on the expensive, 'stunning' end of the spectrum. Put it there. Whole program. Forget about the roads. Now you don't have to shut down FOUR THOUSAND KILOMETERS of active traffic-bearing road, or employ an army of thousands of installers, or repeatedly install it because it "lasts up to ten years". You don't have to deal with an extra layer of glass-polymer tile on top, you don't have to run all of the wiring in the least efficient and least maintainable manner possible, you don't have to do a bunch of things that become necessary if you stick it in the road. 1m^2 of solar panel at 20% efficiency achieves about 200 watts at theoretical best insolation. Solar panels are presently priced around 0.25€ per watt, so we arrive at a cost of around 50€ per square meter panel, or 50x as much as the land to place the panels on. 4 million Euros wouldn't be more than a tiny fraction of a program like this. Using the roads has the potential to increase costs by a factor 10x-1000x over using simple panels.