Yup, wouldn't work, as has been stated, the USA needs Arizona covered in solar panels to run the country off solar power, and every manufacturing plant going, plus being built plus every panel ever made and it would take something like another hundred years or more to do it and cost trillions and simply not be possible.
Solar tech as it is now, is completely unfeasable on any grand scale, because we can't produce the things on any grande scale, they are VERY expensive to make and use expensive materials.
Solar panels need as suggested to find an uber cheap material that can work in place of the expensive parts they need now, considering thats basically the main goal behind every group researching solar panel, and no ones found anything, its unlikely to happen, every cheap ass material will have been tried by now, any more effective material is likely to be something that needs manufacturing, which is unlikely to be cheap.
The simple question is, why? Why do we need led road markings? Paint is cheap and road painters creates unskilled jobs, something the country is desparate for(real jobs, not pointless created ones but ones that are required). Why put an incredibly expensive and delicate thing under cars, solar panels are already expensive and fragile, why add huge expense to the R&D to make the durable enough for the roads, or add further to R&D and production costs and put led's and cables through them?
The only upside is space, the USa don't really want to give up Arizona to make a big huge mirror, neither does anyone else, roads you do need(as of now).
But Solar panels are grande scale completely economicall unviable right now, adding them to road surfaces would simply drive up the price dramatically, making them even more out of reach in terms of cost, and considering not a single place currently making panels is producing "uber hard wearing road solar panels" it would mean adding decades on building new factories to build these panels not a single country in the world can afford to buy
