What is a frequent cause of serious accidents?

You answered correctly because all three factors frequently cause serious accidents in German traffic. Not paying attention to other road users means you may overlook hazards or important signals, increasing accident risk. Driving too closely to the vehicle in front reduces your reaction time and increases the chance of rear-end collisions. Failing to adjust your speed to traffic, weather, or road conditions can also lead to losing control or being unable to stop in time. Together, these errors compromise safety, so always stay alert, keep a safe distance, and adapt your speed appropriately.