Based on the tyre designation, when should you check the road-worthiness of your tyres?

The combination of options 1 and 2 is correct because it highlights the importance of regularly checking the road-worthiness of tyres.

According to German traffic regulations, every time you take possession of a third-party vehicle (option 1), you must ensure that the tyres are in good condition. This is essential for safety, as poorly maintained tyres can lead to accidents.

Additionally, with every tyre change (option 2), it is critical to inspect the tyres. This includes checking for adequate tread depth, any visible damage, and ensuring they are properly inflated. Maintaining the tyres helps ensure optimal vehicle performance and safety on the road.

Option 3, while important, is not specifically necessary for checking tyre road-worthiness on a regular basis; rather, it pertains to general maintenance checks. Therefore, focusing on the first two options captures the essential moments when tyre inspections are crucial under German traffic laws.