Clean, you can use 50% transparency and 0.50 size to draw clean white lines. Better yet, once you draw the 0.50 size line, go over half of it and turn it back into concrete, and you'll get a thin white line to put on the side of roads or also use for parking lots

I like the scripted event where the NPCs fight each other. The mission brief should mention not to intervene unless the deal goes south, or else the mission will fail.