> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/examples/steel-bridge-examples/example-steel-i-girder-bridge-ex1-sig/bridge-geometry-ex1-sig/bridge-alignment-ex1-sig.md).

# Bridge Alignment

The Bridge Alignment defines the centerline of the bridge structure, referencing the previously created Roadway Alignment.

{% hint style="info" %}
**Navigation:** Bridge Geometry > Bridge Alignment

For detailed parameter explanations, see the [Bridge Alignment Reference](https://docs.openbrim.org/templates/steel-i-girder-bridge-workflow/bridge-geometry-sig/bridge-alignment-sig).
{% endhint %}

## Steps

### Step 1: Set the Alignment Reference

Click the **three-dots icon** on the **Alignment** cell, then select **ALIGNMENT1** (the roadway alignment created in the previous step).

![Set Alignment Reference](https://openbrim.atlassian.net/wiki/download/attachments/2101379408/image-20250112-111047.png?api=v2)

### Step 2: Confirm Bridge Alignment Name

Keep the bridge alignment name as the default value.

![Bridge Alignment Name](https://openbrim.atlassian.net/wiki/download/attachments/2101379408/image-20231002-140159.png?api=v2)

### Step 3: Review Bridge Info Tab (Optional)

The **Bridge Info** tab allows you to enter additional bridge metadata if needed. For this example, keep all parameters at their default values.

![Bridge Info Tab](https://openbrim.atlassian.net/wiki/download/attachments/2101379408/image-20231002-140251.png?api=v2)

## Verification

{% hint style="success" %}
After completing these steps, verify your model matches the views shown below.
{% endhint %}

![Bridge Alignment - Plan View](https://openbrim.atlassian.net/wiki/download/attachments/2101379408/image-20231002-140843.png?api=v2)

![Bridge Alignment - 3D View](https://openbrim.atlassian.net/wiki/download/attachments/2101379408/image-20231002-140904.png?api=v2)

## Video Tutorial

{% embed url="<https://openbrim.atlassian.net/wiki/download/attachments/2101379408/bridge%20alignment.mp4?api=v2>" %}
Bridge Alignment Setup
{% endembed %}


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