Tunnels--how do I build them?

[minigorbi]

So I also can't seem to make tunnels- my game is definitely patched to the latest update, my keybindings are all fine, I just can't "lower" roads past ground level. Sounds like I'm going to need to uninstall and reinstall, but is there a way to do that without losing my mods/assets?

Your mods/assets will automatically download themselves when you reinstall the game, as long as you don't unsubscribe.