Place intersections and roundabouts — parametric templates

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The Intersection tool stamps a whole junction — lanes, boundaries, crosswalks and the junction surface — with a single click. Two styles are available, and each one is parametric: you pick the shape you need instead of choosing from a list of fixed templates.

The Intersection tool with the Roundabout style selected: Color, Legs, Width, Lanes and Ring rows in the panel, and a five-leg two-lane roundabout in the white line style on the canvas

Open the tool from the toolbar, choose Intersection or Roundabout at the top of the panel, set the parameters, then click on the canvas. The tool stays on the values you picked, so you can stamp several junctions of the same kind in a row.

Intersection style

Intersection panel — Color, Legs, Width and Lanes

Parameter	Values	What it changes
Color	Black / White	Line color. Black draws every line thin and dark; White draws outer edges thick and white, with thin white lane markings.
Legs	3 / 4	3 gives a T-junction, 4 a crossroads.
Width	Std / Wide	Lane width: 50 px (standard) or 60 px (wide).
Lanes	1 / 2	Lanes per direction on each approach.

A four-leg standard junction and the same junction with three legs:

Four-leg intersection, standard width, one lane per side

T-junction — the same generator with three legs

Wide roads with two lanes per direction produce the larger octagonal surface:

Wide two-lane intersection in the white line style

Turning connections inside the junction are created when you stamp, so the result exports as a proper OpenDRIVE <junction>. See Export to ASAM OpenDRIVE.

Roundabout style

Parameter	Values	What it changes
Color	Black / White	Same line style rule as the Intersection style.
Legs	3 / 4 / 5 / 6	Number of approach roads, evenly spaced.
Width	Std / Wide	Approach lane width (50 px / 60 px).
Lanes	1 / 2	Lanes per direction on each leg.
Ring	1 / 2	Circulating lanes in the ring.

Three, four, five and six legs, all from the same generator:

Roundabouts with three, four, five and six legs

Ring must be at least Lanes

A roundabout cannot accept more approach lanes than it has circulating lanes — two cars entering side by side would have nowhere to go. The panel enforces this: when Lanes is 2, the Ring value 1 is disabled and Ring jumps to 2 automatically.

One approach lane with one circulating lane, one approach lane with two circulating lanes, and two of each:

Ring 1, Ring 2, and two approach lanes with two circulating lanes

Radii are derived, not typed

There is no field for the island radius or the outer diameter. The radii follow from the parameters you set, so that two conditions always hold:

Openings stay apart — adjacent legs never overlap where they meet the ring, whatever the leg count and lane width.
Vehicles fit the curve — a standard vehicle can negotiate the circulating lane without leaving it.

Picking six legs with two lanes, for example, grows the island so the six openings still fit around it. Every combination in the panel is a valid layout by construction.

Direction of travel

Driving Side at the bottom of the panel flips the whole junction. Left-hand traffic circulates clockwise, right-hand traffic counter-clockwise; the geometry is symmetric, so only the lane directions change.

How the pieces connect

Inside a stamped junction the legs and the ring share their boundary points — the same point sharing that lane editing uses. Dragging a leg keeps it attached to the ring, with no gap and no overlap.

Four-leg roundabout, standard width, one lane per direction

Connecting a stamped junction to roads you drew earlier is a manual step: select the lanes and link them with lane connections.

Use the Lane tool — draw the approach roads
Lane connections — join a junction to existing lanes
Export to ASAM OpenDRIVE — junctions in the exported map