# Polyline Direction

To make lane annotation more intuitive and accurate, directional arrows now appear during polyline creation.

{% hint style="success" %} <img src="https://3895963154-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTcOUG6rfWxqGM0N4db2P%2Fuploads%2FGOAkLkFFY9H0DEt10649%2Fbold_idea_icon.png?alt=media&#x26;token=5e795075-b5f4-4e03-a9dd-c01069ceac8b" alt="" data-size="line"> Helps ensure correct lane flow and orientation, especially for traffic-related annotations.
{% endhint %}

![](https://content.gitbook.com/content/TcOUG6rfWxqGM0N4db2P/blobs/eRHhVYP4u3TFJYvK5OKV/image)

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## Benefits

* Reduces confusion about line direction.
* Improves annotation consistency for downstream models.
* Speeds up QA by making intent visually obvious.

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## Steps to Use Polyline Direction

{% stepper %}
{% step %}

### Draw a polyline

As the polyline is drawn, arrows will indicate the direction of the line.
{% endstep %}

{% step %}

### Verify orientation

This helps ensure correct lane flow and orientation, especially for traffic-related annotations.
{% endstep %}
{% endstepper %}

### Reverse Direction

After drawing the polyline, right-click to open the contextual menu and instantly reverse the direction. This change will be applied across the entire sequence.

### Hide Direction

Once the polyline is created, the same contextual menu lets you hide directional arrows to minimize visual clutter during annotation.

{% hint style="success" %} <img src="https://3895963154-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTcOUG6rfWxqGM0N4db2P%2Fuploads%2FGOAkLkFFY9H0DEt10649%2Fbold_idea_icon.png?alt=media&#x26;token=5e795075-b5f4-4e03-a9dd-c01069ceac8b" alt="" data-size="line"> Directional arrows are automatically hidden when the annotation is not selected.
{% endhint %}