> For the complete documentation index, see [llms.txt](https://docs.imerit-prod.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.imerit-prod.io/annotation-tool/key-features/polyline-direction.md).

# Polyline Direction

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

{% hint style="success" %} <img src="/files/qchq9tcQpS8cX7YBw03I" alt="" data-size="line"> Helps ensure correct lane flow and orientation, especially for traffic-related annotations.
{% endhint %}

<figure><img src="/files/WhAxt1vcHxXGpbdVP7MQ" alt=""><figcaption></figcaption></figure>

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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

1. As polyline is drawn, **arrows will indicate the direction** of the line.
2. This helps ensure correct lane flow and orientation, especially for traffic-related annotations.

### Reverse Direction

After drawing the polyline, you can 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="info" %}
Directional arrows are automatically hidden when the annotation is not selected.
{% endhint %}