Which defects of a vehicle can result in a danger for road traffic?

The combination of worn tyres, defective rear lamps, and insufficient braking effect is indeed crucial for ensuring safe road traffic.

1. Worn tyres can significantly affect a vehicle's grip on the road, leading to increased stopping distances and a higher risk of skidding, especially in wet conditions. According to German traffic regulations, tyres must have a minimum tread depth to ensure adequate performance.

2. Defective rear lamps are essential for communicating the vehicle's actions to other road users. If the rear lamps are not functioning properly, it can lead to misunderstandings about the vehicle's intentions, increasing the likelihood of accidents. German law requires that all vehicle lights must be operational to ensure safety.

3. Insufficient braking effect directly impacts a vehicle's ability to stop safely. This defect is particularly dangerous and is regulated under the German Road Traffic Licensing Regulations, which mandate that all vehicles must have proper braking systems that function reliably.

For road safety, it's important to recognize that all three defects can independently create hazardous situations. Thus, including all relevant options in your answer reflects a comprehensive understanding of the potential dangers associated with vehicle defects as outlined in the German traffic rules.