On the snow melting thing. As a regular tar road is, by it's very nature, coated with a surface that is pretty much an almost perfect carbon nanotube ideal black body, probably almost as good as Vantablack ( so black you cannot see it, the next best thing to a black hole event horizon without the nasty gravity killing you) and that is, you guessed it, covered with snow and ice in the winter. Only way to clear it is to either mechanically remove it or to apply melting point depressants. That or wait for spring.
Solar wise the same, but the parking lot is better served with a roof structure, which by it's nature only has to cope with a snow and wind load, not a 22 ton point load ( the maximum axle load permitted on a regular road).