It´s an evergreen.
I think the rise of such projects is succumbed by some sales strategy in which the first problem that comes to mind (or is made to come in mind by pointing it out) is somehow adressed, but all the others and the subsequent problems are ignored until it is an inevitable truth. Most people stop after the first one and are somehow struck of this one roadblocker being no problem or accept that someone else in front of them solved this single, hard problem for them.
The makers somehow maintain to stay in this mindset as well or sell it as experimental, low risk venture project, in need of support for their great idea.
Combined with all kinds of tricks to make people agree to some decision you have a perfectly financed bullshit.
As far as i understood it, concepts like this started out as smart roads that just generate the energy for the signaling and marking during the day. Wear would not even be a big problem for the low demand of low energy LEDs. No one here would need it, as the marking on the road is mostly reflective (glass beads embedded on top of the paint) and other ways to dynamically signal (
signal/sign bridges) are already in place and paid for. Somehow this all went south and focus was put on the need to get as much solar energy as possible.