# Roadway Alignment

This section defines the horizontal alignment, vertical profile, and cross-section of the roadway.

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

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

## Steps

### Step 1: Navigate to Roadway Alignment

Navigate to **Bridge Geometry > Roadway Alignment** in the tree view.

![Navigation](https://openbrim.atlassian.net/wiki/download/attachments/2235334855/image-20230803-134035.png?api=v2)

### Step 2: Set Start Station

Enter the **Start Station** as **23820**.

### Step 3: Open the Alignment Editor

Click the **three-dots icon** on the alignment cell and select **Editor** to define alignment properties.

![Editor](https://openbrim.atlassian.net/wiki/download/attachments/2235334855/image-20230803-134153.png?api=v2)

### Step 4: Define Horizontal Alignment

Click the **+** icon next to **Horizontal** to add circular segments.

![Add Horizontal](https://openbrim.atlassian.net/wiki/download/attachments/2235334855/image-20230711-092612.png?api=v2)

Enter the following horizontal curve parameters:

**Curve 1:**

* Length: **126 ft**
* Radius: **5742 ft**
* Direction: **Towards Left**

**Curve 2:**

* Length: **478 ft**
* Radius: **624 ft**
* Direction: **Towards Left**

![Horizontal Curves](https://openbrim.atlassian.net/wiki/download/attachments/2235334855/image-20230803-134629.png?api=v2)

### Step 5: Define Vertical Profile

Click the **+** icon next to **Vertical** to define vertical sections.

![Vertical Tab](https://openbrim.atlassian.net/wiki/download/attachments/2235334855/image-20230711-110331.png?api=v2)

Enter the following vertical profile points:

| Section | Station (ft) | Elevation (ft) | Grade (%) |
| ------- | ------------ | -------------- | --------- |
| 1       | 23768        | 64.6           | -0.55     |
| 2       | 23877        | 64.0           | -0.55     |
| 3       | 23951        | 64.0           | -2.98     |
| 4       | 24024        | 61.4           | -2.98     |

![Vertical Profile](https://openbrim.atlassian.net/wiki/download/attachments/2235334855/image-20230803-143213.png?api=v2)

### Step 6: Define Transverse Cross-Section

Click the **+** icon next to **Transverse** to define the cross-section at specific stations.

![Transverse](https://openbrim.atlassian.net/wiki/download/attachments/2235334855/image-20230711-112711.png?api=v2)

**Station 1 (23786 ft):**

* Left Edge to PGL: **28 ft**
* Width: **55 ft**
* Slope: **2%**

![Cross Section](https://openbrim.atlassian.net/wiki/download/attachments/2235334855/image-20230803-143850.png?api=v2)

**Stations 2 and 3:**

| Station (ft) | Left Edge to PGL (ft) | Width (ft) | Slope (%) |
| ------------ | --------------------- | ---------- | --------- |
| 23983        | 28                    | 55         | 8.34      |
| 24082        | 28                    | 55         | 8.34      |

![Additional Stations](https://openbrim.atlassian.net/wiki/download/attachments/2235334855/image-20230803-144358.png?api=v2)

### Step 7: Accept Changes

Click **Accept** to save the alignment definition.

<details>

<summary><strong>Quick Tip:</strong> Roadway Surface Visibility</summary>

If the 3D Bridge Alignment doesn't appear in the Graphics Window, either click **Zoom Extents** on the right or enable **Show Roadway Surface** from Settings.

![Roadway Surface](https://openbrim.atlassian.net/wiki/download/attachments/2235334855/image-20230711-122211.png?api=v2)

</details>

## Verification

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

![Completed Alignment](https://openbrim.atlassian.net/wiki/download/attachments/2235334855/image-20230803-144602.png?api=v2)