# Support Lines

This section defines the support line locations for abutments and piers along the bridge alignment, including stations and skew angles.

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

For detailed parameter explanations, see the [Support Lines Reference](https://docs.openbrim.org/templates/precast-i-girder-bridge-workflow/bridge-geometry-pig/support-lines-pig).
{% endhint %}

## Steps

### Step 1: Navigate to Support Lines

Navigate to **Bridge Geometry > Support Lines** in the tree view.

![Navigation](https://openbrim.atlassian.net/wiki/download/attachments/2235629607/image-20230803-145845.png?api=v2)

### Step 2: Create First Support Line (Abutment 1)

Click the **three-dots icon** on the first cell and set the bridge to **"Bridge1"**. Enter Station **23846 ft** for the first abutment.

### Step 3: Create Remaining Support Lines

Create support lines for the remaining structures at their respective stations:

| Support | Station (ft) |
| ------- | ------------ |
| Abut1   | 23846        |
| Pier1   | 23897        |
| Pier2   | 23982        |
| Abut2   | 24027        |

![Support Line Stations](https://openbrim.atlassian.net/wiki/download/attachments/2235629607/image-20230803-150300.png?api=v2)

### Step 4: Define Skew Angles

Enter the skew angle for each support line as shown in the figure below.

![Skew Angles](https://openbrim.atlassian.net/wiki/download/attachments/2235629607/image-20230803-150929.png?api=v2)

<details>

<summary><strong>Quick Tip:</strong> Transverse Offset Direction</summary>

Offset values use the Profile Grade Line (PGL) as the reference point.

![Offset Reference](https://openbrim.atlassian.net/wiki/download/attachments/2104689432/image-20230216-130246.png?api=v2)

</details>

## Verification

{% hint style="success" %}
After completing these steps, your Support Lines should match the view shown below.
{% endhint %}

![Completed Support Lines](https://openbrim.atlassian.net/wiki/download/attachments/2235629607/image-20230803-151049.png?api=v2)

### Video Walkthrough

![Support Lines Setup](https://openbrim.atlassian.net/wiki/download/attachments/2235629607/Support%20Lines.gif?api=v2)