Makes a copy of concrete that looks exactly the same, except it slows down vehicles to around 10Km/h to allow for easier parking. 10 concrete = 10 parking zones. Should work on existing saves, requires concrete to be researched. As per requested by "Peter34"

Now supports Asphalt Roads (https://mods.factorio.com/mod/AsphaltRoads) with high friction asphalt.

Original from @ShinyAfro: https://mods.factorio.com/mod/Shinys-parkingzone