# JunctionArm

> Talos next · Since next

One road meeting a junction: `{ road, end }` for a road that ends there, `{ road, atS }` for one that passes through.

## Fields

| Field | Type | Required | Default | Allowed values | Description |
|---|---|---|---|---|---|
| `road` | `string` | yes |  |  | The id of the entity whose `road` component this arm is. |
| `end` | `RoadEnd` | no |  | `start`, `end` | Which end of the road meets the junction (its first point or its last). Give this or `atS`. |
| `atS` | `number` | no |  |  | Distance along the road, metres, where it passes through the junction and carries straight on: two arms, one each way. Give this or `end`. |

## See also

- `RoadEnd`