Solar roadways is a tremendously stupid idea. There is no need to prove anything from first principle to see that.
There is no need to prove electronics side at all.
All you need is talk to people that are involved into road building (traffic and civil engineers and such) for them to tell you how that business is done.
I have a good friend that does road signage, and in road related projects, even very sophisticated electronics cost is dwarfed by cost of building road and all related building cost. And that is concrete and asphalt. Making road from something that adds cost to it is unacceptable.
Also, big problem with roads is maintenance. Replacing glass tiles all the time kills duty cycle of road in question. Also big no.
In most urban areas there is a problem with free parking spaces. A solar parking that is fully covered with cars has 0 energy from sun. For parkings, a roof with solar panels is a good solution, because it gives cover and collects sun. Win-Win. In Alps, there are many sound walls (road going through residential areas), animal wals, and snow guard overhangs.. All good for solar installations..
Nobody tested how it fares when snow plow runs over it going 40 km/h, or when heavy vehicles from an army run over it, or heavy machinery, or whatever. Or thousands of heavy trucks that shred roads like paper..
Also panels get dirty, when dirt, snow and salt are on them they don't work, they had to put in abrasive layer on top so you don't drive on polished glass. That abrasive layer collects dirt, also tire marks are sticky and pitch black. After some time, glas is completely obstructed. So how are they going to clean that. With chemicals ? What about ecology...
What happens when cargo falls of the trucks? What about salt and crushed stone for winter that is being dispensed on the road?
What happens when you go over the stone, that suddenly transfers all energy of moving car to tiny area on the edge of the stone? What happens when there is an accident? Cars rolling over, sharp steel edges wedging at the edge of the tile, plowing through them like dirt.. Now it leaves a mark in the surface.. With glass all this would need expensive repairs.
And on top of that, panels have less power per sq.meter (datasheets say so) and they are at wrong angle. That alone makes that installation not efficient. And also, even if the panels wouldn't be damaged all the time (which they would), they would need to be ALL replaced after 10-15 years, because solar panels degrade by design.
So yeah, great idea. For people taking money from idiots, with built in job security....