[nullwasamistake]

This was a PR stunt from the beginning.

We can't even make roads last 20 years with the most durable materials we can find. We make them out of rock and they still fall apart.

Car windshields are scratched to hell after a decade. Grocery checkout scanner windows are made of Sapphire, nearly as hard as diamond, and still need to be replaced.

Solar roads will never be a reality. Optically clear material hard and malleable enough seem a physical impossibly. Metals are the only suitable material and they cannot be made transparent due to hard physical constraints.