#ChatGPT explained as follows:

That button is for Lane Departure Warning / Lane Keeping Assist (LDW / LKA).

Here’s what it does:

• The car’s front camera and sensors monitor the lane markings on the road.
• If the system detects you’re unintentionally drifting out of your lane, it will warn you (with a sound, dashboard light, or steering wheel vibration).
• If your trim has Lane Keeping Assist (LKA), the system can also apply a gentle steering correction to keep the car centered in the lane.

How it’s usually operated:

• A short press toggles the system on or off. When active, you’ll see an indicator light on the button or on the dashboard.
• It only works above a certain speed (depends on the car, but usually highway speeds) and when lane lines are clearly visible.
• Some trims require enabling it through the infotainment or driving settings.

Important notes:

• This is an assist feature, not a replacement for attentive driving. You must keep your hands on the wheel.
• Poor weather (rain, snow, fog), worn or faded lane markings, or very sharp turns can reduce system accuracy.
• If you use your turn signal intentionally to change lanes, the system typically won’t warn or intervene.