Over the roads?
There's a company that supposedly can make "solar roads" (panels that you would drive on), but as well as I know they have nothing large scale. I would assume it would be better for commercial driveways (the roads leading up to the building), as it doesn't make sense to use a parking lot or similar that's going to be covered for long periods.
(solar panels above parking lots are fantastic... shades the cars and you don't get wet transitioning in/out of your car ... so long as you account for snow loads so they don't fall and crush whatever is below them)
There was also a project to try to put solar panels over rivers ... which would reduce evaporation to make sure more of it got downstream in arid regions. (but I think they're also trying to figure out how it affects vegetation and animals that might be near the river)
There have also been solar-thermal paving projects, where you take the heat from the parking lot and use it for heating water in the summer ... and they usually put in a ground loop for geothermal, so in the winter you can use it to melt snow and ice.