Building Elevated Roads in Cities: Skylines 2

Elevated roads represent a cornerstone of advanced urban planning in Cities: Skylines 2, allowing players to layer transportation networks efficiently over varied terrain. These structures not only alleviate congestion but also enable creative city designs that mimic real-world infrastructure like overpasses and viaducts. By mastering elevation mechanics, you can direct traffic seamlessly above ground-level obstacles, fostering smoother vehicle flow and higher citizen satisfaction.

Understanding Elevation Basics in Road Construction

In Cities: Skylines 2, every road option includes built-in elevation controls, enabling adjustments from ground level up to significant heights or even below surface for tunnels. Elevation levels increment in precise steps, typically 1.5 meters each, providing granular control over your builds. Starting at 0 meters, roads remain flat until you apply changes, at which point support pillars, retaining walls, or full bridges emerge based on height.

Key thresholds dictate visual and functional shifts: below certain negative levels, roads transition into tunnels; positive elevations trigger pillars first, followed by walls around 5 meters, and true bridge structures at 8.5 meters or higher. This system ensures roads above 8.5 meters can safely pass over underlying paths without interference, ideal for multi-level interchanges.

• Zero elevation: Standard ground-level road adhering to terrain contours.
• Low positive (0-5m): Simple pillars for support.
• Mid-range (5-8.5m): Addition of retaining walls for stability.
• High elevation (8.5m+): Full bridge mode, clear for underpasses.

Step-by-Step Guide to Raising Road Levels

To begin elevating a road, select your desired road type from the build menu—ranging from basic two-lane to multi-lane highways. Draw the initial path on the map, then access the elevation panel, visible in the road options sidebar. Here, arrows allow incremental adjustments, but keyboard shortcuts streamline the process: Page Up raises the level, while Page Down lowers it.

For finer tuning, switch to quarter-step mode in settings, adjusting by 0.375 meters instead of full 1.5-meter increments. This proves invaluable for subtle slopes matching natural landscapes or aligning with existing structures. Once elevated, roads automatically generate necessary supports, adapting to the environment without manual intervention.

1. Select road tool and trace your route.
2. Locate elevation indicator (e.g., “0.0m”).
3. Press Page Up repeatedly or use arrows to climb.
4. Monitor for bridge/tunnel transitions.
5. Confirm placement and test traffic flow.

Pro tip: Existing roads can be retroactively elevated by selecting the segment and applying Page Up/Down, dynamically rebuilding supports as needed.

Integrating Elevated Roads with Terrain Tools

Terrain manipulation complements elevation for professional-looking infrastructure. Use the terrain tool to raise or lower land beneath planned overpasses, ensuring smooth connections. For instance, extend elevated land slightly beyond road ends to form natural retaining walls, enhancing aesthetics and preventing abrupt drops.

Combine cut-and-fill techniques: excavate valleys for underpasses or mound hills for dramatic viaducts. Aim for at least 7.5-8.5 meters clearance when layering roads, allowing lower levels to operate unimpeded. This method shines in hilly maps, where pure elevation might strain budgets or visuals.

Advanced Techniques: Bridges, Tunnels, and Interchanges

Bridges activate automatically at higher elevations, featuring robust railings and seamless transitions. For tunnels, drop below -12.5 meters, where roads burrow underground—perfect for discreet highway routing. Interchanges demand precise layering: highways atop collector roads via ramps, minimizing cross-traffic.

Implement road hierarchy for optimal flow—highways feed into multi-lane distributors, then local streets. Space interchanges 60+ tiles apart early-game to avoid bottlenecks, upgrading one-ways to full highways later. Elevated pedestrian paths add verticality without vehicle clutter, supporting steeper inclines than roads.

Troubleshooting Common Elevation Issues

Players often face snapping problems on uneven terrain—flatten areas first with the bulldozer or terrain tool. If roads refuse elevation, check for obstructing buildings or max height limits. Budget overruns? Start with cheaper road types before scaling up. Visual glitches, like floating pillars, resolve by recoloring or minor terrain tweaks.

For consoles, use D-pad up/down instead of Page keys. Mods can expand options, but vanilla tools suffice for most designs. Test simulations post-build: observe traffic heatmaps to refine elevations, ensuring no backups at ramps.

Strategic Benefits for City Growth

Beyond aesthetics, elevated networks unlock exponential scaling. Stack highways over rail, subways beneath—creating a 3D transit web that handles millions in population. Grids evolve into hierarchical webs: rectangles for residential, radials for commercial hubs, all linked overhead.

Traffic plummets 30-50% with proper overpasses, per community benchmarks. Services reach farther, pollution disperses better, and landmarks fit dramatically. Experiment with roundabouts under bridges for high-volume turns, or custom parks masking infrastructure.

Creative Builds and Real-World Inspiration

Draw from icons like Boston’s Big Dig or Tokyo’s multilayered expressways. Build spiraling ramps for space efficiency, or viaducts threading mountains. Share screenshots on forums—elevated mastery defines pro builders.

In summary, elevation transforms flat grids into thriving metropolises. Practice on new saves, iterate via traffic views, and watch your city pulse with efficient movement.