Available with Network Analyst license.
The Road Forks table identifies pairs of edges (by EdgeFCID/FID/FrmPos/ToPos) where to explicitly place a driving directions instruction that the road forks.
The Road Forks table should reside in the same geodatabase workspace as the network dataset. The schema of the Road Forks table is as follows:
| Field | Format | Description |
|---|---|---|
ObjectID | OID | ObjectID field |
EdgeFCID | Long | The feature class ID of the line feature representing the starting edge |
EdgeFID | Long | The feature ID of the line feature representing the starting edge |
EdgeFrmPos | Double | The from position along the line feature representing the starting edge* |
EdgeToPos | Double | The to position along the line feature representing the starting edge* |
Branch0FCID | Long | The feature class ID of the line feature representing the first possible ending edge |
Branch0FID | Long | The feature ID of the line feature representing the first possible ending edge |
Branch0FrmPos | Double | The from position along the line feature representing the first possible ending edge* |
Branch0ToPos | Double | The to position along the line feature representing the first possible ending edge* |
Branch1FCID | Long | The feature class ID of the line feature representing the second possible ending edge |
Branch1FID | Long | The feature ID of the line feature representing the second possible ending edge |
Branch1FrmPos | Double | The from position along the line feature representing the second possible ending edge* |
Branch1ToPos | Double | The to position along the line feature representing the second possible ending edge* |
Branch2FCID | Long | The feature class ID of the line feature representing the third possible ending edge |
Branch2FID | Long | The feature ID of the line feature representing the third possible ending edge |
Branch2FrmPos | Double | The from position along the line feature representing the third possible ending edge* |
Branch2ToPos | Double | The to position along the line feature representing the third possible ending edge* |
*Notes regarding the from-position and to-position values:
- For travel along the edge in the digitized direction of the line feature, the from-position value is less than the to-position value.
- For travel opposite the digitized direction of the line feature, the from-position value is greater than the to-position value.
- For line features not logically split midspan to create multiple edge elements, the from-position and to-position values are set to 0.0 and 1.0, respectively. Otherwise, these values are set to the fractional values where the logical splits occur for the edge element.
For best performance, it is strongly recommended that the following fields on the Road Forks table have an attribute index:
- EdgeFCID
- EdgeFID
Learn more about indexing an attribute