Stacked roads in Cities: Skylines II are built bottom-up: place the lower road first, then draw the upper one at an elevation that clears it. Parallel stacking and crossings both work in vanilla. If the tool refuses a placement, the clearance is too low or a support would land on the road below.
Stacked roads let two roads share one corridor — a highway above an arterial, or two carriageways on top of each other. This tutorial shows what is possible in vanilla Cities: Skylines II and what isn’t.
Build from the bottom up
- Place the lower road first — at ground level or slightly sunken.
- Switch to the road you want on top and raise the elevation until the tooltip shows enough clearance.
- Draw the upper road along or across the lower one.
- If the placement turns red, raise it another step or shift it sideways so the supports can land.
What works without mods
- Crossings — a road passing over another at any angle.
- Parallel stacking — one road directly above another, as long as the supports find space.
- Elevated junctions above ground-level streets.
What doesn’t (yet)
The video covers the limits of the December 2023 version: very tight clearances, supports placed exactly where you want them and complex multi-level interchanges still need patience or mods. Check the current state of the game before you plan a full multi-level interchange.
Planning tips
- Sketch the levels first. Decide which road is on which level before you build anything.
- Leave room for ramps. Every level change needs a long run-up.
- Combine with sunken roads. Lowering the bottom road by a step often gives the upper one enough clearance at a lower, nicer height — see sunken roads.
Related videos
FAQ
Can I build a double-deck highway in Cities: Skylines II?
Yes. Build the lower highway, then draw the upper carriageway along the same path at a higher elevation. Supports need room beside or between the lower lanes.
Why does the game refuse my upper road?
Either the elevation is too low to clear the road below or a pillar would sit on it. Raise the upper road a step or move it slightly sideways.
Are stacked roads good for traffic?
They save space, not traffic. A stacked interchange still needs sensible lane connections and long enough merges.
