IIRC, they were never deployed to roads. Instead, they were deployed in a pedestrian zone (30 panels or so). It didn't go well, issues included loose panels, failing panels, and a fire in the electronics cabinet.
They are still around, still haven't done anything remotely impressive. These things are idiotic, I say that as someone that backed them way back when. To even remotely be worthwhile you'd need to improve the efficiency percentage several tens of percent.