Solar Roadways don't add up

At night, the LEDs would need powering from power stations. There isn't enough to go round.  12 trillion LEDs would cost $1.4 trillion a year to run - or $5,000 a year for each American.  They would double the power consumption of the country.  LEDs only have a few years life expectancy, even when they aren't being battered by traffic.  

It's another public/private partnership - in other words, the corporations take the profit from the spend.  The people pick up the tab when it all falls apart.

Glass is a soft material, softer than most rocks.  It will not be suitable to build roads from.  Ground glass dust is not entirely healthy to breathe.