How do I activate the lane departure warning system on my Audi A4?

I recently purchased a used Audi A4 and was told it has a lane departure warning system. However, I am having trouble finding how to activate it. Can anyone help?

To activate the lane departure warning system on the Audi A4, you first need to access the vehicle's MMI system. Then, go to the 'car settings' menu and select 'driver assistance'. From there, you can turn on the lane departure warning.

Make sure your Audi A4 is equipped with the lane departure warning system before trying to activate it. If it is, you can simply press the 'lane departure warning' button on the center console to turn it on.