What must you remember with regard to tyre pressure?

The selected combination of options is correct because it highlights two essential aspects of tyre pressure management in accordance with German traffic regulations.

Firstly, regularly checking the air pressure, including that of the spare wheel, is crucial for ensuring safety and optimal vehicle performance. Proper tyre inflation affects handling, fuel efficiency, and can prevent accidents caused by tyre blowouts.

Secondly, adjusting the tyre pressure to the level stated in the vehicle manual when the vehicle is heavily loaded is important. Overloading a vehicle can lead to increased tyre wear and the risk of accidents due to compromised vehicle handling.

Missing the warning about reducing air pressure before longer trips is essential. While it may seem relevant in certain situations, it is not a standard practice required by German regulations. Generally, tyres should be adequately inflated based on the vehicle's loading conditions rather than deflated.

Overall, adherence to these guidelines ensures better control of the vehicle, enhances safety, and complies with traffic regulations in Germany.