Manage lane connections (Next / Prev / Left / Right)

When two lanes share a boundary point, dragging that point moves both lanes at once. The Attribute Panel exposes four explicit connection slots so you can also wire up Next / Previous / Left / Right by hand.

One lane drawn first, then a second is added by extending an existing point — the boundary becomes shared.

Drawing connected lanes

The video starts from an empty canvas with the Lane tool open. The first lane is a single curving lane:

A second lane is then started so its starting boundary lands on the first lane’s existing boundary points. drawtonomy snaps to those points and registers the new lane as a continuation:

The lanes now share a boundary segment. Drag the shared boundary on either lane and both move together. The diverging upper end is independent on each side.

The four connection slots

Press V for Select, click any lane, and look at the right panel. The slots are:

Slot	Means
Next Lanes	Lanes that traffic from this lane flows into.
Prev Lanes	Lanes that flow into this lane.
Left Lane	The lane immediately to the left, sharing a boundary.
Right Lane	The lane immediately to the right, sharing a boundary.

Each slot has two buttons:

• Create — make a brand-new neighbouring lane and point the slot at it.
• Set — pick an existing lane on the canvas to fill the slot.

Connections are bidirectional. Setting Lane A’s Next Lanes to B also adds B to A’s Prev Lanes; drawtonomy maintains the reverse link automatically.

When connections happen automatically

• Drawing a new lane that starts on an existing lane’s boundary point — the case in the demo above. The shared boundary is enough; you don’t need to click Set.
• Placing an intersection template — every approach lane is wired up.

For everything else, click Set and pick the neighbour.

See also

• Lane connection model — why this abstraction exists and what exporters do with it.
• Use the Lane tool