I have a cargo and a bus line between two cities. Since my cargo buses are considerably slower than my passenger buses, the passenger buses are held up by the cargo buses. I built a large country road and expected that the faster buses would start to pass the slower buses. However, it seems that the lines are assigned to a specific lane and all vehicles stick to it (see screenshot). In one direction both lines still share the same lane, so my problem is not solved. Is there a way to manually change one of the lines to the second lane?