You can reverse the 1 way behaviour of highways by right clicking with the upgrade tool, but if you use 1 way 2 lane roads they will inherit the proper direction. Putting 2 2 lane roads next to each other as close as the game will allow(1 cell) and then upgrading them will net you...
This ties nicely into the train topic, which is why we're going to discuss it now. Cities: Skylines is a clever game, but it does have a few dumb simplifiers. One is, there's no relation between physical proximity or connection of your residential areas to industrial areas in order to...