What applies from this traffic sign onwards?

The sign indicates that you are entering the municipality of Wilster, located in the Steinburg district. In Germany, such signs serve as boundary markers for towns and cities, signaling various traffic regulations and road rules that are enforced in that area.

When you see a yellow sign like this, it often means that you are about to enter a built-up area where different traffic rules may apply, such as lower speed limits, pedestrian crossings, and parking regulations. Always be aware of local signs and regulations as you drive in these areas, as they are designed to ensure the safety of all road users.