When should you check the tyre pressure?

The combination of choices you selected is correct. Checking tire pressure regularly when the tires are cool ensures that you get an accurate reading since tire pressure increases with heat during driving. Additionally, checking the pressure directly after a tire change is essential to ensure proper inflation levels for safe driving.

According to German traffic regulations, maintaining correct tire pressure is crucial for vehicle safety and efficiency, impacting vehicle handling, fuel economy, and tire longevity. Regular checks help prevent issues such as blowouts or excessive tire wear. The omission of checking pressure directly after every journey is why that option may seem relevant, but it's not necessary as it can lead to inaccuracies if done when tires are warm from use.