Hold on, Hold on, I think we are all missing a few basic points, here. Don't all of our current roads work without LED lighting, 24/7? Of course they do - with the aid of PAINTED LINES, and REFLECTORS. Zero power consumption, cheap, very high mtbf. So let's forget the idea of (embedded in the road) LED lighting, right now. That must have been a stupid throw-away line by somebody who hadn't done the math.
So do solar roads make sense, now? No. "G'day mate. We're repairing the sewer/water mains/gas/phone/electricity (how ironic would that last one be??) in the road, so we're gonna be out there with our jack hammers lifting the road. Strewth! those glass splinters sure fly! No woarries, mate, after we're done, you won't know we've been..." erm.
The sad thing is that some people will beleive that this is doable, and when they finally realise it isn't will assume that no solar power can be the answer (when in truth, it wasn't even the question). It's all more misinformation on a topic that's just too important for this treatment.
MUCH better idea - why not just put tried-and-tested solar panels on angled frames, down central reservations and alongside major roads (how about rail lines?), and/or on the verges?
Of course, it's not nearly so sexy, but we should be spending the money on figuring our how to use less energy in the first place, than simply (trying to) make more of the wrong sort, to feed our society.
(Moon-lander deniers - Have you checked with the Russians or Japanese, who have each taken their own hi-res photos of the landing sites? Or are they in on your conspiracy "theory", too? Good grief).