You are driving a motor vehicle with a manual gearbox. When driving, what can cause avoidable noise pollution?

The combination of answers you selected—heavily accelerating unnecessarily, a defective silencer, and driving fast in low gears—is correct because all three can significantly contribute to noise pollution while driving.

1. Heavily accelerating unnecessarily creates excessive engine noise and can disrupt the peace in residential areas.
2. A defective silencer fails to muffle engine sounds properly, often resulting in louder than normal noise levels, which may violate local noise regulations.
3. Driving fast in low gears increases engine RPM and thus noise, which can also disturb others and is often seen as irresponsible driving behavior.

According to German traffic regulations, maintaining a quiet environment is important, especially in urban areas, and drivers are responsible for ensuring their vehicles do not contribute to unnecessary noise. Therefore, recognizing all these factors is crucial for responsible driving and adherence to traffic laws.