# Traffic awareness
<a name="concepts-traffic-awareness"></a>

Determines the type of traffic-related information used during route calculation. Flow traffic represents congestion, excluding long-term incident-related congestion. The accuracy of flow traffic data decreases over time, making historical traffic data more reliable for past events.


| Parameter | Description | Routes | Routes Matrix | Isoline | Optimize Waypoint | Snap To Road | 
| --- | --- | --- | --- | --- | --- | --- | 
| Usage | Enable or disable traffic data during route calculation. When enabled, if `DepartureTime`, `ArrivalTime`, or `DepartNow` are not provided, only long-term closures will be considered. Otherwise, if a time is provided, all traffic data is taken into account. | Yes | Yes | Yes | Yes | No | 
| FlowEventThresholdOverride | Duration in seconds for which a flow traffic event is considered valid. While valid, flow traffic data will be used over historical traffic data. | Yes | Yes | Yes | No | No |