- Situation 1: The input network dataset does not support turns.
- Situation 2: There are no turn feature classes defined for the network dataset.
- Situation 1: The ability to model turns has not been specified while creating the network dataset. To support turns, the existing network dataset must be deleted and re-created with the ability to model turns.
- Situation 2: Add the existing or newly created turn feature classes as turn sources for the network dataset and rebuild the network.