Create interchange ramps

This guide explains how to connect independent roads and build entrance ramps, exit ramps, and complete right-turn ramps for an interchange. The core idea is to combine straight segments, transition curves, and circular curves so vehicles can leave one main road smoothly, pass through the bend, and merge into another main road.

Traffic rule note: this tutorial uses right-hand traffic. If your region or planned city uses left-hand traffic, mirror the directions.

Preparation: before building ramps, make sure the map already contains two crossing or near-crossing main roads. They will serve as the foundation for the interchange.

Color hint	Meaning
Dark green	Current mouse position
Light green	Currently selected lane
Blue segment	Ramp or temporary alignment currently being pulled out

Create a direct exit: a direct exit is the most basic ramp type. Vehicles leave the main road directly from the outer driving lane or emergency lane area.

The direct-exit function is still being tested. In production, follow the currently available tools in the game build.

1. Choose the creation tool and move the mouse to the mainline position where you want the exit.
2. To create a ramp exit, start near the outermost emergency lane.
3. Drag the mouse outward to draw a blue ramp segment.
4. Zoom in if needed to check the deflection angle and the connection to the main road.
5. After placing the endpoint, left-click to complete the exit.

If the exit position is placed on a normal driving lane instead of near the emergency lane, the system may create a diverging split rather than a ramp entrance or exit.

Create a parallel exit: a parallel exit creates a smoother departure from the main road. Place a circular curve first, then pull a straight segment from the main road and snap it to the circular curve. The game will generate the transition curve between them.

1. Use the curve tool to create a circular curve near the main road. This becomes the main bend of the ramp.
2. Click the main road and select the outermost emergency lane.
3. Pull a straight segment outward from the main road.
4. Move the mouse and snap it to the circular curve created earlier.
5. The game automatically calculates and generates the transition curve between the main road and the circular curve.
6. Click to confirm and complete the parallel exit.

Core mechanic: the closer the circular curve is to the main road, the shorter the generated transition curve usually becomes. Different circular-curve positions produce different exit locations and transition lengths.

Create an entrance ramp: the steps are the same as for an exit. The game determines whether the result is an entrance or exit based on the direction in which you pull the ramp.

Type	Direction rule
Exit	The ramp extends in the same direction as the main road's forward direction
Entrance	The ramp extends opposite to the main road's forward direction

Create a complete right-turn ramp: after learning simple exits and entrances, combine them with a circular curve to create a complete right-turn ramp between two main roads.

1. Use the curve tool to place a circular curve between the two target main roads.
2. Try to keep both ends of the circular curve close to the target mainlines.
3. From the emergency lane of Main Road A, pull a straight segment and snap it to one end of the circular curve.
4. After the transition curve is generated, click to confirm and finish the exit section.
5. From the emergency lane of Main Road B, pull a straight segment and snap it to the same circular curve.
6. Confirm the connection. The complete right-turn ramp is now created.

Advanced tip: when creating a ramp, the system also creates the physical road body. Do not worry about temporary extra segments; they will be trimmed or deleted automatically during later connections.

Related pages

• Create roads
• Extend roads and connect transition curves
• Road creation failures and preview hints
• Transition curve
• Horizontal curve
• Road design basics