Your motor vehicle is equipped with a lane change assist system without steering intervention. While driving, the warning light flashes on the left-hand exterior rear-view mirror. What is this warning light indicating?

The warning light flashing on the left-hand exterior rear-view mirror indicates that there is another vehicle in the monitored area of your blind spot. This is crucial information for safety while driving. According to German traffic laws, you should not perform a lane change to the left when that light is on, as it signals that it is not safe to do so.

Therefore, the correct choices are that another vehicle is located in the monitored area and you should not attempt to change lanes to the left. It's essential to consider both aspects, as ignoring either one could lead to dangerous situations on the road. Understanding these warnings helps ensure both your safety and the safety of other drivers.