It seems the road tool in the editor (on PC) is not working correctly. Say you want to have 2 asphalt roads then you need to add 2 blocks of asphalt. One for each road. Why is not possible to draw 2 roads with 1 block of asphalt when it is the same material?? Really this is crazy. So if I want 5 roads of asphalt I need to add 5 blocks of asphalt.
You can only draw so many individual roads. So those texture blocks stand for each one. The map I am working on, I had to draw the road, then basically using the same road, run it back up along the original so I could make it wide enough for vehicles to fit on. Literally, the roads are smaller than the vehicles that drive on them.