Managing traffic is a major concern for every Mayor in Cities Skylines, so the ability to elevate roads is a big help. However, it’s not as easy to figure out how to do as one might think. The game doesn’t do a great job of explaining it, and many players may find themselves confused when trying to build elevated walkways and overpasses in their city.
To raise a road in Cities Skylines, you need to be in one of the road placement modes (Straight, Curved, Freeform) and then select a road to begin building. Then, you’ll need to press either Page Up or Page Down on the keyboard to change its elevation.
If you’re using a laptop or a PC, first open the main menu and then click the Options sub-menu. Look for “Build Elevation Up” and “Build Elevation Down” in the Keymapping section and see what keys they’re bound to. If nothing is selected in those boxes, you can click them to remap the buttons.
You’ll also be able to set the increment at which roads change in height through this menu – whether it’s three, six or twelve metres each time a road is raised. Of course, it’s worth pointing out that the maximum road elevation is dependent on the ground at which it was built initially, and there is a limit to how steep a road’s slope can be or it will turn into a bridge.